Optical and Quantum Electronics最新文献

{"title":"Study on the complex refractive index of twisted bilayer graphene grown on a SiO2/Si substrate","authors":"Chun-Lin Wu,&nbsp;Jia-Le Wang,&nbsp;Xin-Wen Wang,&nbsp;Ming-Ming Yang,&nbsp;Hong Zheng,&nbsp;Xuan-Yu Mu,&nbsp;Wei Dang,&nbsp;Ri-Dong Cong,&nbsp;Xiao-Li Li","doi":"10.1007/s11082-025-08460-1","DOIUrl":"10.1007/s11082-025-08460-1","url":null,"abstract":"<div><p>This study investigates the complex refractive index (<span>(:stackrel{sim}{n}=n-ik)</span>) of twenty-four twisted bilayer graphene (tBLG) samples on SiO₂/Si substrates using microscopic reflection spectroscopy. By constructing optical contrast (OC) spectra from the interference patterns between tBLG and the underlying SiO₂/Si substrate, we identified anomalous absorption peaks at wavelengths that depend on the twist angle (θt). A multilayer dielectric structure transfer matrix model was employed to correlate the OC spectra with the complex refractive index of tBLG. The complex refractive index was calculated using two methods, with the thicknesses of tBLG (d₁) and SiO₂ (d₂) as adjustable parameters. The results reveal significant variations in both n and k values at wavelengths corresponding to the anomalous absorption peaks, underscoring the substantial impact of θt on the complex refractive index of graphene.</p></div>","PeriodicalId":720,"journal":{"name":"Optical and Quantum Electronics","volume":"57 10","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optical waveguide as a dual band high sensitivity biosensor based on grating cavity structure","authors":"Sepideh Ebrahimi,&nbsp;Fatemeh Kazemi,&nbsp;Mohammad Reza Rakhshani","doi":"10.1007/s11082-025-08450-3","DOIUrl":"10.1007/s11082-025-08450-3","url":null,"abstract":"<div><p>In this study, a plasmonic waveguide structure based on a cavity design is developed and analyzed as a mid-infrared refractive index sensor. The designed structure has two circular cavities, each containing a disk at its center. This configuration exhibits dual-band optical responses, showing distinct performances across two separate frequency bands with high sensitivity. A slow wave-based spoof (grating) structure is implemented along the edges of the disks, effectively increasing the operational wavelength and, as a result, reducing the overall size of the structure as a miniaturization technique. Analytical results indicate that the combination of the disks and gratings achieves around a 60% miniaturization of electrical length in comparison with an empty cavity design based on the wavelength shift. Furthermore, the proposed structure is utilized as a refractive index sensor for the analysis of liquids with a refractive index in the range of 1 to 1.5. Simulation results reveal that the sensor achieves the maximum sensitivity of 1461(nm/RIU) and 4421(nm/RIU) for the first (λ₁), and second (λ₂) wavelength, respectively and the maximum figure of merit (FOM) of 106 RIU⁻¹ and 4650 RIU⁻¹ for these wavelengths are obtained. Simulations demonstrate high sensitivity and figure of merit (FOM), making the design suitable for compact, high-resolution refractive index sensing in the mid-infrared regime.</p></div>","PeriodicalId":720,"journal":{"name":"Optical and Quantum Electronics","volume":"57 10","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PWM-based far-field blooming mitigation in edge-emitting lasers","authors":"Miroslav Slouka,&nbsp;Ladislav Stanke,&nbsp;Alexandra Pešátová,&nbsp;Jan Pala,&nbsp;Jan Látal,&nbsp;Petr Šiška","doi":"10.1007/s11082-025-08472-x","DOIUrl":"10.1007/s11082-025-08472-x","url":null,"abstract":"<div><p>High-power edge-emitting lasers (EELs) are pivotal in various applications but often suffer from thermal lensing, leading to the far-field pattern (FFP) blooming. This study, focusing on illumination applications, explores pulse width modulation (PWM) output control to mitigate this parasitic effect in green InGaN single-emitter EEL. Detailed goniophotometric measurements and encircled energy analysis were performed. These were supported by a step-by-step simulation manual to quantify the thermal blooming effect in continuous wave (CW) and PWM modes. The results demonstrate that PWM effectively controls thermal lensing, stabilizes FFPs, and thus improves spatial emission. This practical approach enhances performance and reliability and provides a comprehensive framework for optimizing EEL operation.</p></div>","PeriodicalId":720,"journal":{"name":"Optical and Quantum Electronics","volume":"57 10","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advancing infrared detection: graphene’s potential and stability in varied environments","authors":"Elahe Javanshoor,&nbsp;Sohrab Behnia,&nbsp;Fatemeh Nemati","doi":"10.1007/s11082-025-08453-0","DOIUrl":"10.1007/s11082-025-08453-0","url":null,"abstract":"<div><p>Graphene-based infrared detectors exhibit remarkable thermoelectric and photoresponse properties, yet their stability under varying environmental conditions remains a critical challenge. This study investigates the temperature-dependent performance of a graphene/hBN/(gold-hBN-gold) heterostructure infrared detector, focusing on the Seebeck coefficient, voltage response, and thermal stability. By analyzing the system under applied voltages of 0.3 to 0.6 V and temperatures from 300 to 500 K, we noted an enhanced Seebeck coefficient, achieving values up to <span>(-140,upmu,{rm V/ K})</span>. The thermoelectric figure of merit (ZT) improves with temperature, though its magnitude is inversely proportional to the initial operating temperature, highlighting the role of hBN in suppressing phonon-mediated thermal losses. Furthermore, the Brody parameter <span>((beta = 0.58-0.7))</span> confirms spectral selectivity in the <span>(36-54;)</span> THz range. Current-density analysis reveals asymmetric transport behavior, with quantum tunneling dominating at positive biases <span>((&gt; 2,))</span> V and stable p-n junction dynamics at negative biases. These findings demonstrate that optimized doping, hBN integration, and voltage control can mitigate thermal stress, enhancing graphene detectors’ scalability for infrared applications.</p></div>","PeriodicalId":720,"journal":{"name":"Optical and Quantum Electronics","volume":"57 10","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Theoretical study of one-dimensional annular photonic crystal based chemical sensor for detection of organic compounds","authors":"Sujit Kumar Saini,&nbsp;Sakshi Gandhi,&nbsp;Anubha Gupta,&nbsp;Suneet Kumar Awasthi","doi":"10.1007/s11082-025-08352-4","DOIUrl":"10.1007/s11082-025-08352-4","url":null,"abstract":"<div><p>This study investigates the organic compound sensing capability of a one-dimensional (1D) defective annular photonic crystal (DeAPhC). The proposed structure, represented as (AB)⁵CDC(AB)⁵, features a cylindrical air cavity (region D) at its center, whose inner walls are coated with a thin cylindrical layer (region C). This defect is introduced within a periodic annular photonic crystal (APhC) composed of ten alternating layers of materials A and B. The air cavity thickness is optimized to 1400 nm, which yields a maximum quality factor of 10,388.88 and a sensitivity of 1354.5 nm/RIU when the cavity is sequentially loaded with water and pentane. The structure also demonstrates an excellent figure of merit (FoM) on the order of 10⁻³ and a limit of detection (LoD) as low as 10⁻⁵, indicating high precision in detecting trace amounts of organic compounds in water samples. These findings highlight the potential of the proposed DeAPhC structure for highly sensitive chemical sensing. The approach can be extended to the development of advanced sensors for industrial and biomedical applications.</p></div>","PeriodicalId":720,"journal":{"name":"Optical and Quantum Electronics","volume":"57 10","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical simulation of optical properties for silver nanoparticles of different shapes in vacuum and water","authors":"Igor Kon,&nbsp;Andrey Zyubin,&nbsp;Darya Poltorabatko,&nbsp;Ilia Samusev","doi":"10.1007/s11082-025-08452-1","DOIUrl":"10.1007/s11082-025-08452-1","url":null,"abstract":"<div><p>The paper presents the results of using the finite-difference time-domain (FDTD) method to simulate the optical properties of silver nanoparticles (AgNPs) of different shapes. The calculations were carried out in a medium with the refractive index of water (H₂O) and in vacuum, under the incidence of polychromatic radiation. The distributions of the maximum electric field strength as a function of incident radiation wavelength were calculated and plotted. The optical parameters, such as absorption, scattering, and extinction cross sections, were calculated using Ansys Lumerical FDTD software. A complex theoretical explanation of the obtained optical properties in terms of nanoplasmonics is provided. In particular, the patterns of resonant optical peak distribution as a function of irradiation wavelength are discussed. Furthermore, the paper demonstrates the potential tuning of nanoobjects optical properties with various geometries, obtained through controlled synthesis for various fields of applied nanoplasmonics in the H₂O medium. Since colloidal nanoparticles are produced using physical and chemical methods in aqueous solutions, the obtained results can be useful and important for the nanoparticles controlled synthesis and saving laboratory resources.</p></div>","PeriodicalId":720,"journal":{"name":"Optical and Quantum Electronics","volume":"57 10","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"TD-DFT investigation of small molecular donors for enhanced organic photovoltaics","authors":"A. Arunkumar,&nbsp;Xue-Hai Ju,&nbsp;Adeel Mubarik","doi":"10.1007/s11082-025-08454-z","DOIUrl":"10.1007/s11082-025-08454-z","url":null,"abstract":"<div><p>Many researchers are becoming interested in using metal-free organic compounds (especially donor molecules) in photovoltaic (PV) devices nowadays. Considering the (E)-6-(benzofuran-2-yl)-3-(6-(benzofuran-2-yl)-1-(2-ethylhexyl)-2-oxoindolin-3-ylidene)-1-(2-ethylhexyl)indolin-2-one (IBF), seven new donor–acceptor–donor (D–A–D) with small molecular donors (SMDs) (IBF-D1 to IBF-D7) are designed and investigated for organic solar cells (OSCs) using density functional theory (DFT) and time-dependent DFT (TD-DFT) methods. With the MPW1PW91 functional and the 3-21G basis set being chosen, the theoretically calculated wavelengths (<i>λ</i>_<i>max</i>) are presented. The molecular orbitals (MOs) energy gaps (<i>E</i>_<i>g</i>) of the compounds have values ranging from 2.22 to 2.42 eV. Specifically, the lowest <i>E</i>_<i>g</i> values are found in IBF-D1 (2.25 eV) and IBF-D6 (2.22 eV). Compared to IBF (2.19 eV), IBF-D2 and IBF-D7 show lower excitation energy differences (<i>E</i>_<i>x</i>). The derivatives (IBF-D1, IBF-D3, IBF-D4, IBF-D5, and IBF-D6) have the highest <i>λ</i>_<i>max</i> values compared to IBF. The reorganization energies (RE) are between 0.0125–0.0195 eV for electron (<i>λ</i>_<i>e</i>) and 0.0019–0.0115 eV for hole mobilities (<i>λ</i>_<i>h</i>). Additional support for these findings comes from measurements of the transition density matrix (TDM) and molecular electrostatic potential (MEP). Compared to IBF (1.22 eV), IBF-D1 (1.24 eV), IBF-D4 (1.23 eV), and IBF-D6 (1.26 eV) have the highest open circuit voltage (<i>V</i>_<i>oc</i>). The power conversion efficiency (<i>PCE</i>) values range from 0.83 to 1.13 %. In particular, IBF-D1 (1.11%) and IBF-D6 (1.13%) are superior <i>PCEs</i> of the OSCs. The nonlinear optical (NLO) parameters of the dipole moment (<i>µ</i>), polarizability (<i>α</i>), and first-order hyperpolarizability (<i>β</i>) for the molecules IBF-D1 (<i>µ</i> = 1.08 D, <i>β</i> = 1.70 esu, <i>α</i> = 5.00 esu) and IBF-D6 (<i>µ</i> = 3.40 D, <i>α</i> = 5.08 esu, <i>β</i> = 2.44 esu, respectively) are higher than those of IBF (<i>µ</i> = 0.84 D, <i>α</i> = 4.42 esu, <i>β</i> = 0.07 esu)<i>.</i> Finally, IBF-D1 and IBF-D6 are highly advised to design organic PV with remarkable performance for the optoelectronic devices.</p></div>","PeriodicalId":720,"journal":{"name":"Optical and Quantum Electronics","volume":"57 10","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Selecting the state of shape memory alloys by optical filtering","authors":"Ahmed Kotbi,&nbsp;Wiaam El Hakim,&nbsp;Pierre Barroy,&nbsp;Michael Lejeune,&nbsp;Hani Al Hajjar,&nbsp;Muneeb Ullah-Khan,&nbsp;Frederic Lamarque,&nbsp;Andreas Zeinert","doi":"10.1007/s11082-025-08455-y","DOIUrl":"10.1007/s11082-025-08455-y","url":null,"abstract":"<div><p>The aim of this work is to design and fabricate narrow-band optical filters to control the state of shape memory alloys (SMA). The study focuses on developing optical filters capable of inducing localized deformation in SMA micro wires, which are wirelessly operated using laser beams. To achieve this, various filter designs were evaluated through optical modeling of multilayer coatings, tailored to the required filtering function, using the specialized software “Geneticode”. Hexamethyldisiloxane (HMDSO) and silver (Ag) were deposited onto glass substrates using Plasma Enhanced Chemical Vapor Deposition (PECVD) and sputtering techniques, respectively, to fabricate optical filters based on the multi-cavity metal-dielectric (MCMD). The optical properties of the SiOₓC_γ:H and Ag films, including the refractive index, were analyzed using transmission and reflection spectra. These properties were determined by applying classical models such as the O’Leary-Johnson-Lim (OJL) interband transition model, the harmonic oscillator model, Tauc-Lorentz model and the Drude model.</p></div>","PeriodicalId":720,"journal":{"name":"Optical and Quantum Electronics","volume":"57 10","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145078933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A graphene/lithium tantalate THz detector based on the thermopile effect","authors":"Kaveh Rostami","doi":"10.1007/s11082-025-08451-2","DOIUrl":"10.1007/s11082-025-08451-2","url":null,"abstract":"<div><p>This paper presents a terahertz (THz) detector combining graphene and lithium tantalate (LiTaO₃) that operates based on the Seebeck effect. Absorption of THz radiation by the LiTaO₃ slab generates a small temperature gradient across multiple graphene thermocouples connected in series, forming a thermopile that significantly enhances sensitivity. The device achieves a temperature change exceeding 210 mK and a high responsivity above 2.57 V/W at an incident power of 28 µW. Its Noise Equivalent Power (NEP) is estimated at approximately 17.1 nW/√Hz, indicating low noise and high detection precision. Compared to conventional antenna-based detectors, this thermopile offers superior sensitivity while being more compact and cost-efficient. Furthermore, it supports detection at frequencies beyond 4 THz, demonstrating a remarkable advantage over previously reported graphene-based THz detectors.</p></div>","PeriodicalId":720,"journal":{"name":"Optical and Quantum Electronics","volume":"57 10","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145078934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of the optical and thermoplasmonic properties of silica-core nanoparticles coated with copper and gold shells (SiO2/Cu/Au) incorporated into healthy and infected breast tissues (types 1 and 2)","authors":"K. Abich,&nbsp;R. Masrour,&nbsp;A. Akouibaa,&nbsp;M. Benhamou","doi":"10.1007/s11082-025-08445-0","DOIUrl":"10.1007/s11082-025-08445-0","url":null,"abstract":"<div><p>The development of highly tunable plasmonic nanostructures is paramount for advancing photothermal applications in oncology. This study theoretically investigates the optical and thermoplasmonic properties of silica-core nanoparticles coated with successive copper and gold shells (SiO₂/Cu/Au) when embedded within distinct biological media: healthy and infected breast tissues (types 1 and 2). The nanoparticles' optical response is exquisitely sensitive to both their geometry and their surrounding environment. We established that the Surface Plasmon Resonance (SPR) serves as a robust indicator of the host tissue, shifting from <span>(535{text{ nm}})</span> in healthy to <span>(540{text{ nm}})</span> in cancerous media, accompanied by superior absorption in the latter. This intrinsic sensitivity is complemented by a high degree of structural tunability. Systematically reallocating the internal dimensions by increasing the silica core radius while thinning the metallic shells enabled a controlled red-shift of the SPR peak deep into the near-infrared (up to <span>(575{text{ nm}})</span>), together with a pronounced amplification of absorption. This geometric tuning directly translates to a marked enhancement in the local electric field (Faraday's number) and photothermal conversion efficiency (Joule's number). The photothermal performance was assessed under two distinct irradiation regimes. Continuous-wave (cw) exposure revealed a key diagnostic capability: a paradoxical thermal response where the nanoparticles induced a more substantial temperature rise in healthy ~65 °C versus cancerous ~43 °C tissue. This thermal differential acts as a robust signature for tissue discrimination. Transitioning to a femtosecond-pulsed regime revealed an operational mode defined by rapid thermal decay (~7–8 ns) and tight spatial confinement of heat, a feature highly advantageous for targeted therapies. The convergence of tunable plasmonics with a dual, modality-dependent thermal response solidifies the identity of these (SiO₂/Cu/Au) nanostructures as a highly versatile theranostic tool, providing a robust foundation for developing more sophisticated interventions in breast cancer.</p></div>","PeriodicalId":720,"journal":{"name":"Optical and Quantum Electronics","volume":"57 10","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145073684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}