Article
Optics
Fuyong Yue, Riccardo Piccoli, Mikhail Y. Shalaginov, Tian Gu, Kathleen A. Richardson, Roberto Morandotti, Juejun Hu, Luca Razzari
Summary: This research demonstrates the possibility of enhancing third-harmonic generation (THG) in the mid-wave infrared (MWIR) range through designing a metasurface, with a 30-fold enhancement achieved using a highly nonlinear material Ge2Sb2Se4Te1 (GSST). GSST-based metasurfaces offer unprecedented broadband transparency, large refractive index, high nonlinear response, and unique phase-change properties, making them an attractive solution for reconfigurable and ultra-compact nonlinear devices operating in the MWIR.
LASER & PHOTONICS REVIEWS
(2021)
Article
Engineering, Electrical & Electronic
Tamar Haimov, Koray Aydin, Jacob Scheuer
Summary: The proposed approach utilizes an active VO2 layer and a Bragg reflector to achieve dynamic holography at optical frequencies; a reconfigurable metasurface for tunable binary holography is proposed and analyzed; the device can also function as a broad-angle perfect absorber when tuned to the proper temperature.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Zhitong Sun, Jiahao Zhi, Yuanlu Chen, Bijun Xu, Zhifang Qiu, Xiaogang Wang, Xinning Yu
Summary: Unlike other methods that only modify the phase of cross-polarization components, this paper presents a novel concept for multifunctional manipulation of a metasurface through full-phase modulation. This method allows for simultaneous and independent amplitude and phase control of both co- and cross-polarization components of circularly polarized waves. Experimental results at 980nm wavelength demonstrate the feasibility of this complex amplitude control method for circularly polarized light (left or right circularly polarized).
RESULTS IN PHYSICS
(2023)
Article
Optics
Shaobin Zhuo, Yan Li, Annan Zhao, Yu-Ru Li, Shunyu Yao, Mingjie Zhang, Tianhua Feng, Zhaohui Li
Summary: Dynamic metasurfaces offer opportunities for compact and high-resolution spatial light modulation. Existing designs suffer from efficiency issues due to coupling between amplitude and phase modulation. A new design employing Huygens metasurface and phase-change material enables wideband phase modulation with high transmittance and provides a potential solution for efficiency and bandwidth problems in spatial light modulation.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Ming Zhang, Peng Dong, Yu Wang, Baozhu Wang, Lin Yang, Ruihong Wu, Weimin Hou, Junyao Zhang
Summary: In this paper, a design for THz tunable wavefront manipulation achieved by the combination of plasmonic metasurface and phase change materials (PCMs) is proposed. The design allows for tunable reflective anomalous beam deflector and focusing metalens by utilizing the phase difference between the amorphous and crystalline states.
Article
Optics
Hui Yang, Zhenwei Xie, Hairong He, Qiang Zhang, Jiaohao Li, Yilin Zhang, Xiaocong Yuan
Summary: This study demonstrated a meta-device capable of dynamically switching between 2D edge-enhanced imaging and bright-field imaging, functioning as either a high-pass or low-pass filter in the Fourier frequency spectrum depending on its phase state. The meta-device features an ultra-thin architecture and polarization-insensitive dynamically switchable functionality, with potential applications in integrated biomedical imaging and defect detection.
Article
Optics
Zhihong Wang, Songliang Zhao, Huan Jiang, Kangzhun Peng, Weiren Zhao
Summary: This paper presents a giant, broadband, and strength-switchable CD effect achieved in a quadruple z-shaped GST metasurface. The CD can be dynamically switched from 0.92 to 0.05 with the transition from amorphous GST to crystalline GST, offering potential for the development of active chiral devices.
Article
Thermodynamics
Yongjia Wu, Shifeng Yu, Caixia Wang, Qiong Chen, Tingzhen Ming
Summary: This paper proposes a novel concept of jointly using a thermal diode bridge (TDB) and phase change materials (PCMs) to control the air temperature in built environments. The study shows that this method can significantly reduce temperature variation in the built environment without consuming electrical energy or emitting greenhouse gases.
Article
Physics, Multidisciplinary
Hairong He, Hui Yang, Zhenwei Xie, Xiaocong Yuan
Summary: This study proposes a meta-device based on phase change metasurface that can achieve multi-state polarization rotation and vector field steering. By controlling the phase state of each elliptic cylinder in the meta-device, the polarization plane of linearly polarized light can be rotated and optical vortices with different topological charges can be generated.
FRONTIERS OF PHYSICS
(2023)
Article
Optics
Xianyu Huang, Zexu Liu, Yi Lian, Zheng-Da Hu, Jingjing Wu, Jicheng Wang
Summary: In this paper, a cross-shaped all-dielectric metasurface based on GST interlayer is proposed, which can achieve ultra-high transmittance and complete 2 pi phase coverage in the near-infrared band. The design features switchable beam deflection, arbitrary coding, and focusing functions. Multipole decomposition and field distribution characterization are used to reveal the regulation principles of the unit cell before and after switching. Holographic reconstruction based on GS algorithm is also discussed.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Amged Alquliah, Mohamed Elkabbash, Jinluo Cheng, Gopal Verma, Chaudry Sajed Saraj, Wei Li, Chunlei Guo
Summary: The study introduces a novel concept for dynamically controlling guided light in the near-visible spectral range using an ultracompact active metasurface, resulting in a reconfigurable and non-volatile (1 x 2) switch. This innovative device features an ultracompact coupling length and high bandwidth compared to other PCM-based switches, with low losses and low cross talk in the near-visible region.
PHOTONICS RESEARCH
(2021)
Article
Optics
Jinxing Li, Yueyi Yuan, Qun Wu, Shah Nawaz Burokur, Kuang Zhang
Summary: This paper introduces a general method for achieving arbitrary dual-band independent phase control using a double-layered C-shape reflective meta-atom design. Two functional metasurfaces are proposed in the microwave region, one for beam steering in different directions and the other for achromatic beam steering at two distinct frequencies. The simulation and measurement results show good agreement with theoretical predictions, with high efficiency achieved at multiple frequencies for both metasurfaces.
CHINESE OPTICS LETTERS
(2021)
Article
Optics
E. M. Sheta, P. K. Choudhury, Abdel-Baset M. A. Ibrahim
Summary: Investigation was conducted on a metamaterial configuration with a metasurface comprised of pixelated graphene-strontium titanate squared pattern. The study looked at the transmission characteristics under different angular deformations, graphene chemical potentials, and ambient temperatures. Results showed sharp transmission minima under varying temperature and tuning conditions, as well as polarization-insensitive transmission characteristics. These findings could be utilized in tunable temperature and/or strain sensing devices.
Article
Engineering, Electrical & Electronic
Jinghao Li, Wanchen Yang, Suwu Ma, Quan Xue, Wenquan Che
Summary: A novel reconfigurable millimeter-wave tri-band antenna is proposed, which uses co-aperture metasurface structures embedded with electrically controlling VO2 films. By loading a large square ring surrounded by eight small square patches in the same aperture, a co-aperture metasurface structure is designed. Two lower frequencies of 22 and 28 GHz can be excited and switched by embedding the VO2 film into the large ring when the film operates in metallic and insulating states. Meanwhile, an extra higher mode resonance at 40 GHz is produced by the small patches. The proposed antenna can work in three different bands with an adjustable frequency ratio and superior radiation performance, making it distinct from other reported VO2-based antennas.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Multidisciplinary Sciences
Sajjad Abdollahramezani, Omid Hemmatyar, Mohammad Taghinejad, Hossein Taghinejad, Alex Krasnok, Ali A. Eftekhar, Christian Teichrib, Sanchit Deshmukh, Mostafa A. El-Sayed, Eric Pop, Matthias Wuttig, Andrea Alu, Wenshan Cai, Ali Adibi
Summary: The authors demonstrate an efficient platform for electrically driven reconfigurable metasurfaces using phase-change materials. This platform allows for non-volatile, reversible, multilevel, and fast optical modulation and wavefront engineering in the near-infrared spectral range. The study represents a critical advance towards the development of fully integrable dynamic metasurfaces and their potential for beamforming applications.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Applied
Yi-Jou Lin, Yi-Cin Chen, Te-Hua Liu, Chun-Chieh Lin, Chih-Ming Wang, Yu-Kuei Hsu, Mei-Hsin Chen, Chu-Hsuan Lin
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2020)
Article
Optics
Chih-Ming Wang, Chen-Yi Yu, Sheng-Fu Lin, Che-Lung Hsu
Article
Chemistry, Multidisciplinary
Chen-Yi Yu, Qiu-Chun Zeng, Chih-Jen Yu, Chien-Yuan Han, Chih-Ming Wang
Summary: This study theoretically analyzes the phase modulation ability of a dielectric Pancharatnam-Berry (PB) phase metasurface consisting of nanofins. It is found that lambda/2 thickness is not essential for achieving a full 2 pi modulation, but is still needed for high polarization conversion efficiency. Additionally, a gradient phase metasurface is designed and optimized using the particle swarm optimization (PSO) method to reduce wavefront errors and improve diffraction efficiency.
Article
Chemistry, Multidisciplinary
Jeng-Yi Lee, Chih-Ming Wang, Chieh-Lun Chi, Sheng-Rui Wu, Ya-Xun Lin, Mao-Kuo Wei, Chu-Hsuan Lin
Summary: An inorganic polymer composite film was proposed as an effective radiative cooling device in this paper, with enhanced inherent absorption achieved through the selection of appropriately sized SiO2 microspheres. The radiative device produced via a spin coating process demonstrated an increased temperature gradient and enhanced output current under photonic-assisted radiative cooling.
Article
Engineering, Electrical & Electronic
Guang-Yan Liu, Wei-Lun Hsu, Jui-Wen Pan, Chih-Ming Wang
Summary: This paper demonstrates a refractive-meta hybrid system using a ball lens and a meta-corrector to improve efficiency for metalenses with large numerical apertures. The system significantly reduces the spatial frequency requirement of the meta-device while effectively reducing the focal spot size.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Qiu-Chun Zeng, Jia-Ci Chen, Wei-Lun Hsu, Yen-Chun Chen, Chien-Yuan Han, Yeeu-Chang Lee, Chih-Ming Wang
Summary: This study presents the design and fabrication of a dielectric metasurface with free-form phase distribution and with a large period unit cell using i-line stepper, dry etching, and nanoimprint technology. The optical measurement result shows the off-axis focusing spot is with loss aberration and the corresponding Strehl ratio is 0.34, with a diffraction efficiency of around 2%. The low efficiency is mainly attributed to the rounding of the rectangular nanostructures during the pattern transfer and relatively thin thickness, and the polarization-dependency of this large period metasurface is also discussed.
Article
Optics
Yen-Chun Chen, Qiu-Chun Zeng, Chen-Yi Yu, Chih-Ming Wang
Summary: This paper proposes a simple model combining effective medium theory and the Jones matrix to analyze the optical properties of a dielectric PB-phase metasurface with arbitrary incident polarization state. The model provides fast and accurate analysis compared to finite difference time domain methods, showing good agreement with the results. The discussion also focuses on the simplicity of the proposed model.
Article
Chemistry, Physical
Chih-Yao Chen, Ching-Yun Chien, Chih-Ming Wang, Rong-Sheng Lin, I-Chen Chen
Summary: Tunable plasmonic liquid gallium nanoparticles were prepared through surface anodizing, and the change in particle shape and nanoscale dimple-like textures on the surface have been found to affect the localized surface plasmon resonance wavelength.
Review
Chemistry, Multidisciplinary
Wei-Lun Hsu, Yen-Chun Chen, Shang Ping Yeh, Qiu-Chun Zeng, Yao-Wei Huang, Chih-Ming Wang
Summary: This paper provides a review of current metasurfaces and metadevices, and analyzes the relationship between the aspect ratio and efficiency of different materials.
Article
Chemistry, Physical
Ying-Chu Chen, Ying-Zhen Chen, Chih-Ming Wang, Yu-Kuei Hsu
Summary: In this study, Ag electrode was anodically etched to generate Ag nanocorals (NCs) consisting of closely interconnected Ag nanoparticles (NPs) with coordinately unsaturated Ag atoms at the grain boundaries. Electrokinetic studies showed that these under-coordinated Ag atoms stabilized the hydrogen intermediates on Ag NCs and facilitated the transfer of hot electrons generated by the relaxation of localized surface plasmon resonance (LSPR) under visible and near-infrared (NIR) light illumination. As a result, the hydrogen evolution reaction (HER) over Ag NCs was significantly accelerated, achieving a cathodic current density of 10 mA cm-2 at an early overpotential of h = 156 mV compared to other Ag-based electrocatalysts reported in the literature. This outstanding performance highlights the great potential of Ag NCs as an alternative photoelectrocatalyst, taking advantage of incident light for enhanced HER, in solar fuel production compared to state-of-the-art Pt electrocatalysts.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Optics
Wei-Lun Hsu, Chen-Yi Yu, Hao-Ting Lai, Yen-Chun Chen, Chih-Ming Wang
Summary: The current high-aspect-ratio Pancharatnam-Berry (PB)-phase metasurfaces in which vertical dimensions are much larger than the lateral dimensions are challenging to fabricate. Therefore, reducing the aspect ratio requirement has become a research priority. We propose a sandwich nano-fin consisting of GaN/amorphous silicon (a-Si)/GaN on a silica substrate to reduce the strict aspect ratio requirement of current PB-phase metasurfaces. The phase modulation ability and polarization conversion efficiency (PCE) of sandwich nano-fins were investigated. Compared with a conventional GaN nano-fin, the aspect ratio of sandwich nano-fin decreased from 6 to 4 under the same geometric dimension. The PCE of the sandwich nano-fin was up to 68.27%, 1.5 times higher than that of a GaN nano-fin under the same aspect ratio of 4. Moreover, after adding the a-Si layer, the overall PCE improved from 32.17 to 40.54% for the sandwich nano-fin. The sandwich structure simultaneously reduces the challenge of manufacturing and improves efficiency compared to current PB-phase metasurfaces.
Article
Multidisciplinary Sciences
Yu-Hsuan Liao, Wei-Lun Hsu, Chen-Yi Yu, Chih-Ming Wang
Summary: We propose a hetero-nano-fin structure to enhance the efficiency of Pancharatnam-Berry phase metasurfaces. Two hetero-nano-fin types, MgF2/GaN and MgF2/Nb2O5, were studied. The overall polarization conversion efficiency (PCE) of the MgF2/GaN nano-fin increased from 52.7% to 54% compared to the bare GaN nano-fin. The overall PCE of the Nb2O5 nano-fin was 1.7 times higher than that of the GaN nano-fin. The application of MgF2 antireflection improved the overall PCE from 92.4% to 96% and increased efficiency by an average of 4.3% in the wavelength range of 450 to 700 nm. Although the increment of energy seems minimal, antireflection is crucial for a metasurface to enhance efficiency and reduce background signal.
SCIENTIFIC REPORTS
(2023)
Article
Optics
Yen-Chun Chen, Wei-Lun Hsu, Meng-Qi Xie, Hsiao-Hsuan Yang, Yuan-Chieh Cheng, Chih-Ming Wang
Summary: A light-field camera is an optical system that captures multi-field-angle information in a single shot. The microlens array in the camera is crucial for providing this information but its numerical aperture affects the spatial resolution and image quality. In this study, a new microlens array consisting of a larger primary microlens and 72 satellite microlenses is proposed. This array allows for high-resolution image information from different angles and can be easily fabricated at a low cost. The measured spatial resolution of the primary microlens is 53.74 lp/mm higher than that of the satellite microlens when the modulation transfer function is 0.3. The demonstration photograph of the light-field camera shows a high-resolution view along with different views from various angles. This high-resolution light-field camera holds promising potential for applications in object ranging and face recognition in the future.
Article
Materials Science, Multidisciplinary
Fang Yin Zhao, Thi Anh Nguyet Nguyen, Chia-Wei Tsai, Che-Men Chu, Wei-Yen Woon, Chien-Ting Wu, Kun-Lin Lin, Yo-Song Huang, Chih-Ming Wang, Fan-Ching Chien, Kun-Yu Lai
Summary: Surface-enhanced Raman spectroscopy (SERS) is a technique capable of verifying the presence of single molecules. Researchers favor the bianalyte proof which relies on statistical analysis of thousands of spectra and extends the plasmonic fields through coupling InGaN quantum dots with Au nanoparticles. This new method redefines the rule for single-molecule detection.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Kai-Hao Chang, Yen-Chun Chen, Yo-Song Huang, Wei-Lun Hsu, Guo-Hao Lu, Chao-Feng Liu, Chun-Jen Weng, Yu-Hsin Lin, Che-Chin Chen, Chien-Chieh Lee, Yu-Chi Chang, Po-Hsiang Wang, Chih-Ming Wang
Summary: This study presents the design, fabrication, and experimental characterization of an axicon metalens for energy harvesting in composite metal-oxide semiconductor sensors. The metalens consists of a central disc for light focusing and nanoposts for deflecting light to form a Bessel-like beam. Micro-hyperspectral imaging is used to measure the spatial distribution of optical transmission. The axicon metalens improves the peak transmission by up to 250% compared to a blank TiO2 film, and its performance is validated by finite-difference-time-domain simulation.
