Advanced Photonics Research最新文献

{"title":"The Interaction of Femtosecond Laser with Perovskites for Advanced Photonics","authors":"Beibei Xu,&nbsp;Tao Man,&nbsp;Xintong Yu,&nbsp;Xinyu Cai,&nbsp;Zehui Zhou,&nbsp;Dezhi Tan,&nbsp;Jianrong Qiu","doi":"10.1002/adpr.202400047","DOIUrl":"10.1002/adpr.202400047","url":null,"abstract":"<p>Halide perovskites have attracted increasingly attention as “rising star” materials for advanced photonics and optoelectronics. Construction micro-/nano-architecture of perovskites will provide a good platform to investigate and optimize the fundamental photon–matter–structure interaction. It will also improve the properties, pixelate and miniaturize the integration of versatile optoelectronic devices for emerging applications. In this regard, femtosecond (fs) laser processing technique has been widely used to fabricate micro-/nano-architecture with high spatial resolution, limitless flexibility, and unrestricted three-dimensional structuring capability at a large-scale, low-cost way. Concurrently, it is reported that the high refractive index, low thermal conductivity and ultrafast thermalization rate of perovskites are beneficial for the processing by fs laser into micro-/nano-architecture without the degradation of their optoelectronic properties. This review systematically summarizes the interaction of fs laser with perovskites, including the mechanisms, and phenomena. Besides the traditional optoelectronics and applications of halide perovskites, the novel properties and applications from optical structures generated by fs laser processing of perovskites are also discussed. The challenges and outlooks for fs laser processed perovskite materials and devices are highlighted. This review will promote the relevant fundamental research on light–matter–structure interaction, and facilitate the integration of perovskite micro-/nano-architecture-based optoelectronic devices.</p>","PeriodicalId":7263,"journal":{"name":"Advanced Photonics Research","volume":"5 11","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/adpr.202400047","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141107129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biocompatible and Implantable Hydrogel Optical Waveguide with Lens-Microneedles for Enhancing Light Delivery in Photodynamic Therapy","authors":"Lieber Po-Hung Li,&nbsp;Ai-Wei Li,&nbsp;Wei-Yu Chen,&nbsp;Chia-Hsiung Cheng,&nbsp;Yu-Bin Chen,&nbsp;Cheng-Yang Liu","doi":"10.1002/adpr.202400031","DOIUrl":"10.1002/adpr.202400031","url":null,"abstract":"<p>The finite penetration depth of light in biological tissues is a practical constraint in light-induced therapies, such as antimicrobial light therapy, photothermal therapy, and photodynamic cancer therapy. Herein, a biocompatible and implantable device, termed hydrogel planar waveguide with lens-microneedles, for light delivery in deep tissue is demonstrated. The prototype device, integrated planar waveguide and lens-microneedles, is fabricated by press-molding polyethylene glycol diacrylate polymers. The optical beams through the lens-microneedles are focused at a specific point to realize the optimal intensity profile in the tissue. The adequate treatment depth and region for the hydrogel planar waveguide with five lens-microneedles are extended to 24 mm and 3.1 cm². The photoswitchable chemotherapeutic against colorectal cancer cells is switched by using different hydrogel waveguides. The performances of hydrogel-waveguide-enabled photoswitching are characterized by the dose responses from the optical microscope, crystal violet staining, and MTT assays. The anticancer drug activated by the hydrogel planar waveguide with five lens-microneedles is shown to be twice as effective as the other fibers and waveguides in causing cancer cell death. The proposed biodegradable waveguide can be utilized for long-term light delivery and does not require to be removed as it is gradually resorbed by the tissue. The results point to a new paradigm for widespread use in photomedicine.</p>","PeriodicalId":7263,"journal":{"name":"Advanced Photonics Research","volume":"5 8","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/adpr.202400031","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141103994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Inkjet Printing of Yb:YAG Transparent Ceramic Planar Waveguide Laser Gain Medium","authors":"Haoran Wang,&nbsp;Wenlan Gao,&nbsp;Jian Zhang,&nbsp;Jie Ma,&nbsp;Haohao Ji,&nbsp;Mengmeng Xie,&nbsp;Xiaojian Mao,&nbsp;Shiwei Wang,&nbsp;Lei Wang,&nbsp;Yuan Gao","doi":"10.1002/adpr.202300320","DOIUrl":"10.1002/adpr.202300320","url":null,"abstract":"<p>Herein, a YAG/10 at% Yb:YAG/YAG transparent ceramic planar waveguide (PWG) gain medium has been molded via inkjet printing and dry pressing molding. The composition and rheological property of ink are optimized along with the printing process to enhance the printing accuracy and quality. The PWG has dimensions of 13.5 × 8.0 × 1.8 mm³, while the thickness of the core Yb:YAG layer is ≈190 μm. The in-line transmittance of the PWG reaches 81.7% at 1030 nm, and the average grain size is ≈2.3 μm. The diffusion characteristics of Yb ions across the interface between the cladding YAG layer and the core Yb:YAG layer are investigated by calculating the diffusion coefficient and the mean diffusion distance of ¹⁷²Yb ions. The Yb:YAG PWG oscillator, which is pumped from a single end by a 940 nm laser diode, produces continuous wave laser at a wavelength of 1030 nm and exhibits the highest power (3.8 W) and highest absorbed–output slope efficiency (64.6%).</p>","PeriodicalId":7263,"journal":{"name":"Advanced Photonics Research","volume":"5 8","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/adpr.202300320","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141107294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Silicon-Rich Nitride Refractive Index as a Degree of Freedom to Maximize Nonlinear Wave Mixing in Nanowaveguides","authors":"Dmitrii Belogolovskii,&nbsp;Nikola Alic,&nbsp;Andrew Grieco,&nbsp;Yeshaiahu Fainman","doi":"10.1002/adpr.202400017","DOIUrl":"10.1002/adpr.202400017","url":null,"abstract":"&lt;p&gt;Silicon nitride is widely used in integrated photonics for optical nonlinear wave mixing due to its low optical losses combined with relatively high nonlinear optical properties and a wide-range transparency window. It is known that a higher concentration of Si in silicon-rich nitride (SRN) magnifies both the nonlinear response and optical losses, including nonlinear losses. To address the trade-off, four-wave mixing (FWM) is implemented in over a hundred SRN waveguides prepared by plasma-enhanced chemical vapor deposition in a wide range of SRN refractive indices varying between 2.5 and 3.2 (measured in the C-band). It is determined that SRN with a refractive index of about 3 maximizes the FWM efficiency for continuous-wave operation, indicating that the refractive index of SRN is indeed a crucial optimization parameter for nonlinear optics applications. The FWM efficiency is limited by large nonlinear optical losses observed in SRN waveguides with indices larger than 2.7, which are not related to two-photon absorption. Finally, the third-order susceptibility &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;χ&lt;/mi&gt;\u0000 &lt;mn&gt;3&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$left(chiright)_{3}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; and the nonlinear refractive index &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;n&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$n_{2}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; are estimated for multiple SRN refractive indices, and, specifically, the nonlinearities as large as &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;χ&lt;/mi&gt;\u0000 &lt;mn&gt;3&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mo&gt;(&lt;/mo&gt;\u0000 &lt;mn&gt;12.6&lt;/mn&gt;\u0000 &lt;mo&gt;±&lt;/mo&gt;\u0000 &lt;mn&gt;1.4&lt;/mn&gt;\u0000 &lt;mo&gt;)&lt;/mo&gt;\u0000 &lt;mo&gt;×&lt;/mo&gt;\u0000 &lt;msup&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;10&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;mn&gt;19&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/msup&gt;\u0000 &lt;mo&gt; &lt;/mo&gt;\u0000 &lt;msup&gt;\u0000 &lt;mi&gt;m&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msup&gt;\u0000 &lt;mo&gt; &lt;/mo&gt;\u0000 &lt;msup&gt;\u0000 &lt;mi&gt;V&lt;/mi&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/msup&gt;\u0000","PeriodicalId":7263,"journal":{"name":"Advanced Photonics Research","volume":"5 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/adpr.202400017","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141112363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bulged CH3NH3PbBr3 Microwires for Single-Mode Lasing","authors":"Wanling Wu,&nbsp;Zhiqiang Luo,&nbsp;Tao Xu,&nbsp;Yipeng Lun,&nbsp;Jiale Deng,&nbsp;Xingzhao Huang,&nbsp;Huanqing Ye,&nbsp;Huakang Yu,&nbsp;Zhongmin Yang","doi":"10.1002/adpr.202300271","DOIUrl":"10.1002/adpr.202300271","url":null,"abstract":"<p>Herein, the lasing action of fabricated bulged CH₃NH₃PbBr₃ microwires is demonstrated with features of a low threshold, narrow linewidth, single-mode operation, and high intensity. Benefiting from the bulged end facets, the CH₃NH₃PbBr₃ microwires are feasible for constructing a high-brightness, whispering-gallery-mode(WGM)-type, and single-mode laser while suppressing Fabry–Pérot-type multi-mode lasing. Numerical simulation unveils that the bulged end facets result in the significantly reduced reflectivity of fundamental waveguided modes. The obtained microlasers require neither complex structures (such as distributed Bragg reflector) nor careful pumping adjustment, suggesting the practical feasibility of a higher single-mode lasing intensity than conventional WGM perovskite microlasers. The results provide new routes to realize high-performance perovskite microlasers and their potential application in sensing refractive index.</p>","PeriodicalId":7263,"journal":{"name":"Advanced Photonics Research","volume":"5 11","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/adpr.202300271","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141108250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Thermally Reconfigurable Photonic Switch Utilizing Drop Cast Vanadium Oxide Nanoparticles on Silicon Waveguides","authors":"Gregory Tanyi,&nbsp;Daniel Peace,&nbsp;Mohammed Taha,&nbsp;Elliot Cheng,&nbsp;Xuan Hiep Dinh,&nbsp;Guanghui Ren,&nbsp;Christina Lim,&nbsp;Arnan Mitchell,&nbsp;Ranjith R. Unnithan","doi":"10.1002/adpr.202300295","DOIUrl":"10.1002/adpr.202300295","url":null,"abstract":"<p>Photonic switches play a vital role in optical communications and computer networks for establishing and releasing connections of optical signals. With the growing demand for ultra-compact switches in high-speed optical computing and communications, thermally reconfigurable optical switches have gained significant attention. These switches offer simplicity, ease of fabrication, and leverage a wide range of thermo-optic materials. Silicon remains an ideal platform for making photonic devices including the switches due to its compatibility with complementary metal-oxide-semiconductor (CMOS) technology and cost-effectiveness. The article presents a drop cast sub-stoichiometric vanadium oxide (VO_2−<i>x</i>) nanoparticles combined with a silicon ridge waveguide to make a compact thermally reconfigurable optical switch with low transition temperature and accelerated phase transition. Furthermore, the design achieves high modulation depth in addition to its scalability and simplicity. This study demonstrates the potential of solution-based VO_2−<i>x</i> nanoparticles in combination with silicon waveguides for efficient optical switch design for various applications.</p>","PeriodicalId":7263,"journal":{"name":"Advanced Photonics Research","volume":"5 7","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/adpr.202300295","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140973607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Localized Surface Plasmon Resonance Optical Biosensor for Simple Detection of Deoxyribonucleic Acid Mismatches","authors":"Masixole Yvonne Lugongolo,&nbsp;Saturnin Ombinda-Lemboumba,&nbsp;Lerato Hlekelele,&nbsp;Nontsikelelo Nyokana,&nbsp;Patience Mthunzi-Kufa","doi":"10.1002/adpr.202300283","DOIUrl":"10.1002/adpr.202300283","url":null,"abstract":"<p>Optical biosensors are optical technologies that evaluate changes in the refractive index as they monitor non-covalent molecular interactions in real time. These make use of unsophisticated, label-free analytical approaches, which do not require dyes to produce a visible signal. In this study, the efficiency of localized surface plasmon resonance (LSPR) biosensor in detecting a single nucleotide mismatch in deoxyribonucleic acid is examined. The detection is based on the hybridization of a target DNA at 100 ng μL⁻¹ with a complementary biotinylated probe as well as a partially complementary biotinylated with one nucleotide mismatch probe on a gold-coated surface. Both probes are used at a concentration of 0.1 μm. The LSPR exhibited sensitivity by differentiating sample M+ from sample C+ through varying transmission intensities of 0.28 and 0.26 μA, respectively. Based on these findings, this approach demonstrates a great potential due to its ability to distinguish samples that differ with a single base pair, and its efficiency will be explored in the development of a point-of-care device as a simpler and cost-effective approach for detection of various biologically and medically significant mutations such as antimicrobial resistance mutations. More work is underway to determine the robustness of the LSPR biosensor using the biotin–neutravidin approach.</p>","PeriodicalId":7263,"journal":{"name":"Advanced Photonics Research","volume":"5 7","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/adpr.202300283","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140976541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dual-Comb Interferometry for Coherence Analysis of Tightly Locked Mid-Infrared Quantum Cascade Laser Frequency Combs","authors":"Alexandre Parriaux,&nbsp;Kenichi N. Komagata,&nbsp;Mathieu Bertrand,&nbsp;Valentin J. Wittwer,&nbsp;Jérôme Faist,&nbsp;Thomas Südmeyer","doi":"10.1002/adpr.202400006","DOIUrl":"https://doi.org/10.1002/adpr.202400006","url":null,"abstract":"<p>\u0000Frequency combs are powerful tools for many applications and high performances are achieved by stabilizing these lasers. For operation in the mid-infrared, quantum cascade lasers (QCL) are ideal candidates as they present numerous advantages. However, stabilized QCL-combs lack a detailed characterization of their noise properties due to the sensitivity limits of current analyzing techniques. To overcome these challenges, what is believed to be the first tightly locked dual QCL-comb system is developed. Its use is twofold. First, phase noise analysis of the dual-comb signal shows residual phase noise below 600 mrad for all comb lines, and the comb coherence as well as the performances of the repetition frequency locking mechanism is characterized. Second, coherent averaging with a 7 × 10⁵ Hz^1/2 figure-of-merit system is demonstrated, which is compatible with high-precision spectroscopy.</p>","PeriodicalId":7263,"journal":{"name":"Advanced Photonics Research","volume":"5 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/adpr.202400006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142435621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Review: Active Tunable Terahertz Metamaterials","authors":"Jining Li,&nbsp;Jiyue Chen,&nbsp;Dexian Yan,&nbsp;Fei Fan,&nbsp;Kai Chen,&nbsp;Kai Zhong,&nbsp;Yuye Wang,&nbsp;Zhen Tian,&nbsp;Degang Xu","doi":"10.1002/adpr.202300351","DOIUrl":"10.1002/adpr.202300351","url":null,"abstract":"<p>The diversity and practicability of terahertz metamaterials have experienced rapid development in the past decade due to the increasing demand for various devices. This topic has attracted significant interest from researchers. Among the key functional devices in terahertz metamaterial systems, the active control ability of terahertz metamaterials is highly valuable and captivating. This implies that the electromagnetic properties of metamaterials can be modulated over a wide dynamic range by external stimuli. This review categorizes the different types of tunable terahertz metamaterials based on the external stimuli to which they respond, namely, mechanical modulation, electrical modulation, magnetic modulation, and optical modulation. Mechanically modulated devices offer simple yet efficient modulation, while electrical and magnetic modulation provide effective active modulation through electrical mechanisms. Optical modulation, in contrast, focuses on incorporating various materials to achieve active modulation.</p>","PeriodicalId":7263,"journal":{"name":"Advanced Photonics Research","volume":"5 7","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/adpr.202300351","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140972142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Robust Layer-Dependent Valley Polarization and Valley Coherence in Spiral WS2 at Room Temperature","authors":"Xiangdong Li,&nbsp;Tong Tong,&nbsp;Xiaopeng Fan,&nbsp;Minru Qi,&nbsp;Shen Wang,&nbsp;Guofeng Zhang,&nbsp;Ruiyun Chen,&nbsp;Jianyong Hu,&nbsp;Zhichun Yang,&nbsp;Ganying Zeng,&nbsp;Chengbing Qin,&nbsp;Liantuan Xiao,&nbsp;Suotang Jia","doi":"10.1002/adpr.202400014","DOIUrl":"10.1002/adpr.202400014","url":null,"abstract":"<p>In the emerging field of valleytronics, it is aimed to coherently manipulate the valley pseudospin as an information-bearing degree of freedom. The 2D transition-metal dichalcogenides (TMDCs) provide a unique possibility to generate an excitonic valley pseudospin, opening the way to valley information. Although significant development of valley pseudospin in layered materials has been achieved recently, looking for new TMDCs featuring robust valley phenomenon at room temperature is still desirable for practical applications. Herein, the valley pseudospin of the spiral WS₂ with different layer thicknesses at room temperature is investigated by both circular and linear polarization-resolved photoluminescence spectroscopy. In the experimental results, it is demonstrated that the spiral WS₂ emerges robust valley polarization and valley coherence, the degree of circular polarization, and linear polarization gradually increase with the lift of the layer thicknesses, reaching up to 0.91 for valley polarization and 0.94 for valley coherence, respectively. The robust layer-dependent valley pseudospin may originate from the intrinsic broken inversion symmetry, due to the spiral structure of the multilayer WS₂. The robust and near-unity valley polarization and valley coherence at room temperature in the spiral WS₂ may provide a new platform for optical manipulation of the valley pseudospin for further valleytronics applications.</p>","PeriodicalId":7263,"journal":{"name":"Advanced Photonics Research","volume":"5 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/adpr.202400014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140987078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}