Photonics and Nanostructures-Fundamentals and Applications最新文献

{"title":"Defect-engineered graphene infrared emitting devices with enhanced stability and low power consumption","authors":"Yui Shimura,&nbsp;Jumpei Yamada,&nbsp;Hideyuki Maki","doi":"10.1016/j.photonics.2026.101651","DOIUrl":"10.1016/j.photonics.2026.101651","url":null,"abstract":"<div><div>Graphene-based infrared emitters utilizing Joule-heating-induced blackbody radiation have shown broadband emission and high-speed modulation. However, the role of graphene crystallinity in determining emission characteristics, power consumption, and operational stability has not yet been fully clarified. In this study, we investigate intentional defect introduction by O₂ plasma irradiation as an approach to modify the thermal and electrical properties of graphene infrared emitters (GEs). Under fixed ECR-plasma conditions, the device resistance progressively increased with irradiation time, providing a practical process-control parameter for selecting the irradiation endpoint. The defects introduced resulted in a significant increase in channel resistance and a reduction in in-plane thermal conductivity. The increased channel resistance reduces the fractional contribution of the graphene–metal contact resistance and redistributes Joule heating toward the graphene channel, whereas the reduced in-plane thermal conductivity suppresses lateral heat spreading toward the electrodes. These combined electrical and thermal effects result in localized central emission and reduce the electrical input power required to obtain a comparable relative NIR-camera signal. Moreover, defect-engineered GEs exhibit gradual resistance recovery under bias due to thermally induced partial defect recovery and maintain stable infrared emission for over 16 h, in contrast to the severe degradation observed in non-defective devices. These results provide a practical design strategy for realizing low-power and highly stable graphene-based infrared-emitting sources.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"72 ","pages":"Article 101651"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149153424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and analysis of a nickel-coated polarization-insensitive ultra-wideband metamaterial infrared absorber for thermal imaging applications","authors":"Sudipta Das,&nbsp;Nagandla Prasad,&nbsp;Mahesh Valathuru,&nbsp;Tanvir Islam,&nbsp;Naglaa F. Soliman,&nbsp;M. Jaya Surya Sai,&nbsp;Ambati Navya","doi":"10.1016/j.photonics.2026.101630","DOIUrl":"10.1016/j.photonics.2026.101630","url":null,"abstract":"<div><div>A metamaterial absorber (MMA) using a cost-effective nickel material is proposed for infrared region applications. The resonating patch is composed of a metamaterial-based circular resonator with unique fourfold rotationally symmetric curved arms. The cost-effective nickel (Ni) material is utilized for both bottom and top conductive layers, and Rogers RT5880 is used as a dielectric material for the proposed absorber structure. The transmission of electromagnetic radiation is prevented by the bottom-side nickel-based layer. The overall physical size of the proposed unit cell is only 1.7 μm × 1.7 μm × 2.5 µm, which corresponds to an ultra-compact electrical size of 0.0916λ₀ × 0.0916λ₀ × 0.1347λ₀. The proposed absorber maintains a high absorptance of <span><math><mo>≥</mo></math></span>90% over an ultra-wide absorption bandwidth of 25.36 THz with polarization insensitivity and wide angular stability. It operates from 16.16 THz to 41.52 THz, corresponding to 7.22 μm to 18.55 μm wavelength range, covering the designated spectrum of the long-wave infrared (LWIR) atmospheric window (8–14 μm) and partly extending into adjacent infrared spectral regions. The absorption bandwidth of 25.36 THz corresponds to a relative bandwidth (RBW) of 87.93%. The proposed thermal MMA shows Full Width at Half Maximum (FWHM) of 120%, which is 37.5 THz, covering 12.5–50 THz ultrawide spectrum. The proposed MMA effectively maintains a spectral emissivity of <span><math><mo>≥</mo></math></span>0.90 across its entire functional band, confirming its applicability as an efficient ultra-wideband thermal emitter. Based on the results of this proposed study, the recommended nickel-based polarization-independent infrared metamaterial absorber (IR-MMA) could be an excellent option for thermal imaging, molecular spectroscopy, and stealth technology applications.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"72 ","pages":"Article 101630"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148843895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Compact zoom system with a fixed image plane","authors":"Chakwa Si,&nbsp;Baocheng Han,&nbsp;Jinbei Chen,&nbsp;Liheng Yan,&nbsp;Zihao Zhao,&nbsp;Qiaolin Liao,&nbsp;Jianling Xiao,&nbsp;Juntao Li","doi":"10.1016/j.photonics.2026.101625","DOIUrl":"10.1016/j.photonics.2026.101625","url":null,"abstract":"<div><div>Zoom imaging systems are widely used in machine vision and optical inspection, but conventional designs rely on mechanical translation of multi-element optics, limiting system compactness. Meta-optics provides a promising route to overcome this limitation, yet challenges remain in achieving large zoom ranges and maintaining a fixed image plane. Here, we demonstrate a compact zoom system with a fixed image plane by combining a phase modulator with a longitudinally translated metalens. Under 532 nm illumination, a theoretical zoom ratio of 22.5 × is achieved. Imaging of a 1951 USAF resolution target further demonstrates a 17.3 × zoom range while maintaining a resolution exceeding 10 lp/mm across the entire range. This work provides a mechanically simplified strategy for large-range zoom imaging with potential applications in portable and industrial imaging systems.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"72 ","pages":"Article 101625"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148843896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A reflective orbital angular momentum metasurface for broadband radar cross section reduction","authors":"Tengrui Ma,&nbsp;Lijian Zhang,&nbsp;Zepeng Zhao,&nbsp;Tianle Wei,&nbsp;Zexin Yu,&nbsp;Yahao Li,&nbsp;Yujin Cui,&nbsp;Shu Li","doi":"10.1016/j.photonics.2026.101619","DOIUrl":"10.1016/j.photonics.2026.101619","url":null,"abstract":"<div><div>Many reported reflective orbital angular momentum metasurfaces have primarily addressed vortex-beam generation at discrete frequencies, while broadband OAM generation and scattering suppression within the same aperture remain insufficiently explored. We propose a broadband reflective metasurface that simultaneously realizes OAM beam generation and radar cross-section reduction over the 14–<span><math><mrow><mn>42</mn><mspace></mspace><mi>GHz</mi></mrow></math></span> band. Using anisotropic butterfly-shaped meta-atoms and 3-bit discretized Pancharatnam–Berry phase coding, two configurations generate OAM modes with topological charges of <span><math><mrow><mi>l</mi><mo>=</mo><mo>−</mo><mn>1</mn></mrow></math></span> and <span><math><mrow><mi>l</mi><mo>=</mo><mo>−</mo><mn>2</mn></mrow></math></span> under right-handed circularly polarized incidence. Full-wave simulations demonstrate annular intensity distributions, central phase singularities, and azimuthal phase windings, while spectral decomposition confirms target-mode dominance at representative frequencies across the band. The core advantage is that the same encoded helical phase profile both forms the vortex wavefront and redistributes specular reflection over a broader angular range, thereby reducing backscattering without an additional absorbing layer or separate RCS-control structure. Measurements agree with the simulated broadband RCS-reduction trend and confirm the low-backscattering performance of the fabricated samples. By integrating OAM wavefront control with low-scattering performance, this work offers a viable route toward broadband electromagnetic stealth, complex wavefront engineering, and advanced multifunctional microwave metasurface devices.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"72 ","pages":"Article 101619"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148843897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Free-space excitation of whispering gallery mode microcavities via photonic hooks from a Janus-type stratified medium-filled microcylinder","authors":"Zhenmin Wang,&nbsp;Duanduan Wu,&nbsp;Yu Zhuang,&nbsp;Xiong Huang,&nbsp;Zejie Zheng,&nbsp;Haonan Zhuo,&nbsp;Shengchuang Bai,&nbsp;Hui Yang,&nbsp;Guoqiang Gu","doi":"10.1016/j.photonics.2026.101618","DOIUrl":"10.1016/j.photonics.2026.101618","url":null,"abstract":"<div><div>We investigate free-space excitation of whispering gallery mode (WGM) microcavities using a photonic hook (PH) generated by a Janus-type stratified medium-filled microcylinder. This work extends our previous photonic nanojet (PNJ)-based free-space coupling study from straight near-field focusing to a curved, reconfigurable near-field beam. The proposed structure consists of a dielectric microcylinder and a Janus inner region formed by two media with different refractive indices and a well-defined interface. By tuning the refractive-index asymmetry and rotation angle of the Janus region, a confined PH is generated in the shadow region and directed towards the WGM microcavity. The PH does not provide a universal efficiency advantage over a symmetric PNJ-like focus; instead, it offers an additional spatial degree of freedom when the cavity position is constrained or when a larger cavity benefits from a longer curved interaction region. Numerical simulations show a resonance dip with a minimum transmission of 57.2% and identify the cavity position near the PH focal region as the strongest relative-excitation condition. Rotating C<span><math><msub><mrow></mrow><mrow><mtext>Janus</mtext></mrow></msub></math></span> further enables reversible energy redistribution between two symmetric WGM microcavities. These results suggest that coupling through PHs may provide a compact, all-dielectric route for free-space beam routing and local WGM excitation.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"72 ","pages":"Article 101618"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148730901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improved application of the photodetector for silver and copper core-double shells (Ag@Cu@Ag) compared with individual materials prepared by pulsed laser","authors":"Ahmed A. Aktafa,&nbsp;Haitham T. Hussein,&nbsp;Safaa M. Kheder,&nbsp;Wafaa Khalid Khalef,&nbsp;Abdulqader D. Faisal,&nbsp;Majid S. Jabir,&nbsp;Dhulfiqar S. Mutashar,&nbsp;Uday M. Nayef,&nbsp;Yusuf A. Jassem","doi":"10.1016/j.photonics.2026.101620","DOIUrl":"10.1016/j.photonics.2026.101620","url":null,"abstract":"<div><div>The research compared a novel Ag@Cu@Ag core double-shelled composite to existing nanomaterials, including Ag NPs, Cu NPs, and Ag@Cu core shells. Using a pulsed laser technique in deionized water, the novel composite exhibited superior electrical and photoresponsive characteristics. Key parameters included 1200 mJ energy, 5 Hz frequency, 500 light pulses, and a 1064 nm wavelength. XRD analysis confirmed the presence of silver and copper, revealing crystal sizes of 15.56 nm (Ag NPs), 70.96 nm (Cu NPs), 22.29 nm (Ag@Cu single shell), and 14.79 nm (Ag@Cu@Ag double shell). The structure of the core shell was confirmed by TEM testing, and the particle form was spherical. The mean particle size of Ag -NPs, Cu- NPs, Ag@Cu core shell and Ag@Cu@Ag core double-layer shell had been 19.4, 17.4, 19.7 as well as 19.8 nm, respectively. FESEM determined the nanoparticles' spherical shapes and sizes: 76 nm (Ag), 66 nm (Cu), 71 nm (Ag@Cu CSNPs), and 98 nm (Ag@Cu@Ag CSNPs). UV–visible spectroscopy showed minimal change in absorbance peaks for the novel composite, indicating enhanced optical efficiency. The Ag@Cu@Ag composite also demonstrated excellent photoresponse and electrical properties, suggesting its potential for light-sensitive applications.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"72 ","pages":"Article 101620"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148843811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reconfigurable plasma-based metasurfaces for holographic reconstruction of alphanumeric patterns and images","authors":"Ghidaa T. Ahmed,&nbsp;Saber H. Zainud-Deen,&nbsp;Hend Abd El-Azem Malhat,&nbsp;Mona Magdy Badawy","doi":"10.1016/j.photonics.2026.101639","DOIUrl":"10.1016/j.photonics.2026.101639","url":null,"abstract":"<div><div>This paper introduces a novel plasma-based reconfigurable holographic metasurface (RHM) that leverages dynamically tunable plasma elements for reconfigurable wavefront manipulation at 17 GHz. It consists of an 81 × 81 array of argon-filled glass unit-cell elements mounted on a grounded substrate. The RHM modulates surface impedance via DC-biased ionization, enabling precise control of plasma angular frequency (5–12 ×10 ¹¹ rad/s) and achieving surface impedance tuning from 214 Ω to 152 Ω with &lt; 1% error, as validated by CST Microwave Studio simulations and Drude-model analytics. The encoding of complex phase distributions derived from Rayleigh-Sommerfeld diffraction allows faithful reconstruction of alphanumeric holograms using English and Arabic languages such as \"EGYPT\", “a, A, b and c letters” and \"تحيا مصر\" at a focal plane located 100 mm away from the metasurface. The proposed reconstruction image showed successful recovery of the target profile with a reasonable structural similarity to its object pattern, with an accuracy of 81% and an SSIM of 0.63. The effect of pixels on the reconstructed image resolution shows that 61 × 61 grids yield blurred edges due to insufficient sampling. Parametric studies reveal an optimal propagation distance balancing near-field distortion spreading, yielding sharp, high-contrast images. Extending to multi-plane holography, phase superposition enables simultaneous encoding of distinct patterns (\"S\" at 100 mm, \"A\" at 180 mm), spatially separating reconstructions via Huygens-Fresnel propagation without crosstalk. Full-wave simulation and MATLAB validations confirm &gt; 90% phase fidelity. The proposed plasma-based RHM metasurfaces offer transformative potential for compact, high-resolution electromagnetic imaging, yet conventional designs suffer from static phase profiles and limited multifunctionality. Additionally, the current work was developed in order to expand the scope of the research and enable its use in advanced field configurations where a two-dimensional target image may be reconstructed.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"72 ","pages":"Article 101639"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149004520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and optimization of grating based D-shaped PCF-SPR sensor through Taguchi method for RI-based blood cancer sensing","authors":"Srijan Jaiswal,&nbsp;Ankur Kumar,&nbsp;Ankur Pandey,&nbsp;Jitendra Bahadur Maurya,&nbsp;Sameh Kaziz,&nbsp;Sajal Agarwal","doi":"10.1016/j.photonics.2026.101655","DOIUrl":"10.1016/j.photonics.2026.101655","url":null,"abstract":"<div><div>A highly sensitive surface plasmon resonance (SPR) sensor is proposed and numerically investigated for blood cancer detection. The presented sensor is based on photonic crystal fiber (PCF) and employs a silver plasmonic grating. In the proposed structure, the D-shaped geometry has been utilized, which enhances the evanescent field interaction and improves the core and surface plasmon polariton (SPP) mode coupling. The refractive index (RI) of the analyte is varied from 1.362 to 1.390 to investigate the RI dependent sensing response of the proposed structure. The selected RI range is considered for RI based biomedical sensing relevant to blood cancer related applications. The simulations are performed on COMSOL Multiphysics software using Full-vector finite-element-method (FEM) to analyze the performance parameters. Local optimization of structural parameters is carried out to improve the sensing response, and the Taguchi method is further employed to study the impact of geometrical parameters on the sensing performance of the sensor. The proposed sensor achieves a wavelength sensitivity of <span><math><mrow><mn>35,000</mn><mspace></mspace><mtext>nm/RIU</mtext></mrow></math></span> with a maximum amplitude sensitivity (AS) of <span><math><mrow><mn>499.26</mn><mspace></mspace><msup><mrow><mtext>RIU</mtext></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></math></span>, and minimum resolution of <span><math><mrow><mn>2.86</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>6</mn></mrow></msup><mspace></mspace><mtext>RIU</mtext></mrow></math></span> indicating that the suggested sensor is highly sensitive and offers very good resolution. Furthermore, the evaluated resonance linewidths give FWHM values in the range of 128–182 nm, with a maximum figure of merit (FOM) of <span><math><mrow><mn>192.31</mn><mspace></mspace><msup><mrow><mi>RIU</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></math></span> at <span><math><mrow><msub><mrow><mi>n</mi></mrow><mrow><mi>a</mi></mrow></msub><mo>=</mo><mn>1.380</mn></mrow></math></span> making it a promising sensor for blood cancer sensing and other biomedical sensing applications based on RI sensing.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"72 ","pages":"Article 101655"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149199717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polarization-selective dual-channel PCF-SPR sensor with orthogonal plasmonic interfaces for wide-range refractive index detection","authors":"Md. Jahid Hasan,&nbsp;Mahjabin Alam Mim,&nbsp;Nargis Sultana","doi":"10.1016/j.photonics.2026.101608","DOIUrl":"10.1016/j.photonics.2026.101608","url":null,"abstract":"<div><div>A dual-channel photonic crystal fiber surface plasmon resonance (PCF-SPR) refractive index sensor is proposed for polarization-selective analyte detection over two distinct RI regimes. The sensing architecture employs two orthogonally positioned plasmonic regions integrated with side-polished surfaces to strengthen the evanescent-field interaction between the guided core mode and the plasmonic/analyte interface. The design rationale is based on the tangential nature of surface plasmon excitation at the metal-dielectric boundary, allowing Channel-I (CH-I) and Channel-II (CH-II) to respond selectively to y- and x-polarized modes, respectively. Unlike conventional single-window or merely dual-polarization PCF-SPR/LSPR sensors, the proposed structure enables two independently optimized sensing channels for low-to-mid and high RI analytes. CH-I operates over the RI range of 1.24–1.43 and achieves a maximum wavelength sensitivity of 11,500 nm/RIU, maximum amplitude sensitivity of −1291.2 RIU⁻¹, figure of merit of 287.14 RIU⁻¹, optimized resolution of 8.70 × 10⁻⁶ RIU, and calibration coefficient of R² = 0.9617. CH-II operates over the higher RI range of 1.46–1.54 and demonstrates superior performance, with a maximum wavelength sensitivity of 26,000 nm/RIU, maximum amplitude sensitivity of −3526.65 RIU⁻¹, figure of merit of 1210.428 RIU⁻¹, optimized resolution of 1.00 × 10⁻⁶ RIU, and calibration coefficient of R² = 0.9993. These results confirm that orthogonal plasmonic placement combined with polarization-selective modal excitation can significantly improve RI detection capability while broadening the practical sensing applicability of PCF-SPR platforms.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"72 ","pages":"Article 101608"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148572969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A tunable dual-function terahertz metamaterial absorber based on vanadium dioxide and graphene","authors":"Yujie Yang,&nbsp;Yunfei Cui,&nbsp;Mao Wang,&nbsp;Zhengwei Xie,&nbsp;Mingyang Tian,&nbsp;Yijia Huang,&nbsp;Yarong Su,&nbsp;Jie Zheng,&nbsp;Mingjun Tang","doi":"10.1016/j.photonics.2026.101612","DOIUrl":"10.1016/j.photonics.2026.101612","url":null,"abstract":"<div><div>In this paper, a tunable dual-function terahertz absorber is proposed by integrating the phase-transition property of vanadium dioxide (VO₂) with the Fermi-level tunability of graphene. Here, the dual functionality specifically refers to broadband absorption switching over 3.0–4.25 THz, with the absorptance tunable from nearly 0 to nearly 98%, and narrowband-to-broadband mode conversion over 4.25–5.50 THz. Electromagnetic-field analyses indicate that the broadband absorption is associated with the Fabry–Pérot (FP) cavity resonance between the graphene and VO₂ layers, together with dipolar and higher-order multipolar resonances induced by localized surface plasmon resonance (LSPR) in graphene, whereas the narrowband absorption mainly originates from the LSPR in the graphene layer. Further investigations show that the tunable absorptance can be realized through the electrically tunable properties of graphene and the thermally tunable properties of vanadium dioxide. In addition, in the broadband mode, absorptance above 90% can be maintained for incident angles from 0° to 50°, and polarization insensitivity can be achieved under normal incidence. The proposed absorber provides both broadband switching and broadband–narrowband mode switching, showing potential for multifunctional terahertz dynamic devices.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"72 ","pages":"Article 101612"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148572968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}