Article
Materials Science, Multidisciplinary
Yongzhi Cheng, Jinxiu Wang
Summary: This paper presents a tunable terahertz circular-polarization (CP) convertor based on graphene metamaterial, which can achieve high efficiency polarization conversion at specific Fermi energy levels and be continuously adjusted for various applications.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Optics
Mayank Agarwal
Summary: The reflection type linear polarization rotator using L-shaped slot resonator achieves wideband performance due to the overlapping of nearby resonance modes. The polarization rotation is achieved through the structural anisotropy, resulting in a high polarization conversion ratio. Additionally, the structure is competitive in terms of ultrathin substrate thickness, very low form factor, and wide-angle performance.
Article
Chemistry, Analytical
Guowen Ding, Yanjun Zhou, Shuyang Zhang, Xinyao Luo, Shenyun Wang
Summary: In this work, a reconfigurable ultra-wideband transmissive terahertz polarization rotator based on graphene metamaterial is proposed. The polarization rotation can be switched within a broad terahertz band by changing the Fermi level of graphene. The proposed graphene metamaterial offers a novel approach for the design of a terahertz tunable polarization rotator and is expected to be applied in the applications of terahertz wireless communication, imaging, and sensing.
Article
Physics, Multidisciplinary
Tian Yang, Xiaoming Liu, Ji Zhou
Summary: The paper introduces a unique metamaterial design combining the EIT effect and polarization conversion, achieving nearly perfect cross-polarization conversion and suppressing radiation loss. The importance of symmetry is demonstrated in the phenomenon of polarization conversion and EIT effects disappearing when an identical cut-wire is placed on the other side of the SRR, providing a new way to address the loss problem in MM polarization devices and inspiring new high-performance multifunctional MM designs.
ANNALEN DER PHYSIK
(2021)
Article
Materials Science, Multidisciplinary
Yadgar Abdulkarim, Fatih Ozkan Alkurt, Halgurd N. Awl, Fahmi F. Muhammadsharif, Mehmet Bakir, Sekip Dalgac, Muharrem Karaaslan, Heng Luo
Summary: A new ultra-thin and dual band metamaterials perfect absorber (MPA) design was proposed in this work, operating in the frequency range from 15 to 35 THz with high absorptivity. The proposed design is insensitive to incident angles and polarization angles, suitable for applications in stealth technology and imaging.
RESULTS IN PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Tianli Dong, Ying Zhang, You Li, Yupei Tang, Xunjun He
Summary: A dual-function switchable terahertz (THz) device is proposed, which enables dynamic switching between broadband absorption and polarization conversion based on the phase transition of vanadium di-oxide (VO2). By manipulating the conductivity of photosensitive silicon, dynamic modulation of the amplitude in both functions is achieved simultaneously. The device consists of seven layers, and in the metallic phase of VO2, it acts as a broadband absorber with a relative bandwidth of 80% in the frequency range of 0.78-1.81 THz. When VO2 is in the insulating phase, the device functions as a polarization converter with a cross-polarization conversion ratio over 90% and a relative bandwidth up to 96% in the frequency range of 0.51-1.45 THz. The device offers a wide range of possible applications in sensors, detectors, solar cells, etc., due to its dynamic switching between functions and dynamic tuning of performance.
RESULTS IN PHYSICS
(2023)
Article
Chemistry, Physical
Xiang Miao, Zhongyin Xiao, Zhentao Cui, Tiantian Zheng, Xiaoyu Wang
Summary: In this paper, a reflective polarization convertor based on a sandwich structure is proposed, achieving ultra-wideband and higher relative bandwidth characteristics. This structure effectively controls the polarization of terahertz band electromagnetic waves, converting incident linear-polarized waves to cross-polarized waves and circular-polarized waves. It has potential applications in radar antenna, metamaterial lens, and other electromagnetic wave and optical fields.
Article
Optics
Shitong Xu, Fei Fan, Hongzhong Cao, Yinghua Wang, Shengjiang Chang
Summary: In liquid crystal integrated metamaterials, a strong local resonance mechanism enhances the efficiency of linear polarization conversion for terahertz waves. The Fabry-Perot-like resonance can be actively tuned by modulating the refractive index of the LC layer, resulting in multi-band tunable linear polarization conversion.
CHINESE OPTICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Mingjia Xing, Yunjie Teng
Summary: A dual-functional terahertz metamaterial device is proposed based on the temperature-controlled phase change properties of vanadium dioxide (VO2). The device can switch between an absorber and a polarization converter. Simulation results show that the device acts as a terahertz wave absorber in the metallic state of VO2, with a reflected extinction ratio of less than -15 dB in the frequency range of 1.07-1.19 THz. When VO2 is in the insulated state, the device functions as a polarization converter, achieving a polarization conversion rate of over 90% in the frequency range of 1.43-1.51 THz. The proposed device has broad applicability in terahertz detection, modulation, and switching.
Article
Engineering, Electrical & Electronic
A. M. Mabrouk, Asmaa G. Seliem, A. A. Donkol
Summary: This study proposes a high-gain polarization converter using a graphene-based metamaterial array, which can convert linearly polarized wave into reconfigurable right-handed or left-handed circular polarizations, and can increase the antenna's bandwidth and gain.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Yi Ren, Bin Tang
Summary: This paper presents a multi-functional terahertz metamaterial device based on gold and vanadium dioxide, showcasing switchable performance between perfect absorption and broadband asymmetric transmission. The device demonstrates high efficiency in absorption and transmission, as well as perfect polarization conversion.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Physics, Multidisciplinary
Haotian Du, Mingzhu Jiang, Lizhen Zeng, Longhui Zhang, Weilin Xu, Xiaowen Zhang, Fangrong Hu
Summary: A switchable THz polarization converter based on VO2 metamaterial is proposed. It can achieve cross-linear polarization conversion in a broadband when VO2 is in insulating state, and linear-to-circular polarization conversion in a broadband when VO2 changes to metallic state under thermal stimulus.
Article
Engineering, Electrical & Electronic
A. M. Mabrouk, Asmaa. G. Seliem, A. A. Donkol
Summary: This paper proposes a high-gain reconfigurable polarization antenna using a metasurface polarizer. The metasurface polarizer consists of 25 unit-cell elements, each consisting of a circular copper patch and two arrow-shaped copper strips. The antenna can convert incident-plane waves into reconfigurable left- or right-hand circular polarization. The dipole antenna has an increased operating -10 dB bandwidth and gain when combined with the metasurface polarizer.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Yujie Zhong, Yi Huang, Shuncong Zhong, Tingting Shi, Fuwei Sun, Tingling Lin, Qiuming Zeng, Ligang Yao, Xuefeng Chen
Summary: This study achieves frequency-agile absorption adjustments by utilizing the coupling between total reflection prism and electrically-driven MoS2. The redistribution of electric field and susceptible dielectric response are found to be attributed to limited spatial near-field perturbation. The study also demonstrates that perturbed MoS2 plasmon modes promote the formation of dual-phase singularities to suppress attenuation of absorption amplitude, extending the relative tuning range.
Article
Chemistry, Multidisciplinary
Meng Chen, Yingxin Wang, Ziran Zhao
Summary: The frequency spectra and polarization states of terahertz waves contain important physical and material information, and compact on-chip platforms are being investigated for capturing these quantities effectively. This paper presents a hybrid device that integrates photodetection, wavelength, and polarization selectivity into a single architecture, using the properties of metamaterials and graphene. The detector shows resonantly enhanced photoresponse at specific target wavelengths with orthogonal polarizations, and its versatile capabilities are demonstrated for spectrally selective and polarization resolved imaging on a single-chip platform without advanced optical components. This strategy benefits the future development of multifunctional, compact, and low-cost terahertz sensors.
Article
Crystallography
Ya-Wen Tsai, Yao-Ting Wang, Pi-Gang Luan, Ta-Jen Yen
Article
Chemistry, Physical
Pavithra Sriram, Yu-Po Wen, Arumugam Manikandan, Kun-Chieh Hsu, Shin-Yi Tang, Bo-Wei Hsu, Yu-Ze Chen, Hao-Wu Lin, Horng-Tay Jeng, Yu-Lun Chueh, Ta-Jen Yen
CHEMISTRY OF MATERIALS
(2020)
Article
Chemistry, Analytical
Shih-Ting Huang, Shen-Fu Hsu, Kai-Yuan Tang, Ta-Jen Yen, Da-Jeng Yao
Article
Multidisciplinary Sciences
Chung-Wei Tao, Ta-Jen Yen, Tsung-Yu Huang
SCIENTIFIC REPORTS
(2020)
Article
Chemistry, Multidisciplinary
Soniya S. Raja, Chang-Wei Cheng, Yungang Sang, Chun-An Chen, Xin-Quan Zhang, Abhishek Dubey, Ta-Jen Yen, Yu-Ming Chang, Yi-Hsien Lee, Shangjr Gwo
Article
Chemistry, Multidisciplinary
Yu-Hung Hsieh, Bo-Wei Hsu, Kang-Ning Peng, Kuan-Wei Lee, Chih Wei Chu, Shu-Wei Chang, Hao-Wu Lin, Ta-Jen Yen, Yu-Jung Lu
Article
Optics
Jian-Hui Lin, Ta-Jen Yen, Tsung-Yu Huang
Article
Nanoscience & Nanotechnology
Ching-Han Mao, Abhishek Dubey, Fang-Jing Lee, Chun-Yen Chen, Shin-Yi Tang, Ashok Ranjan, Ming-Yen Lu, Yu-Lun Chueh, Shangjr Gwo, Ta-Jen Yen
Summary: This study proposes an approach to enhance 2D MoS2 photosensing by combining plasmonic nanostructures and physical suspension, resulting in a hybrid structure with high responsivity and large active area. The gateless responsivity of the hybrid structure reaches 402.4 A/W at a wavelength of 532 nm, representing the highest value reported for gateless plasmonic MoS2 photodetectors. The exceptional detectivity of 2.34 x 10(12) Jones highlights the potential of this approach for designing high-performance 2D TMDC-based optoelectronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Hao-Yuan Tsai, Che-Chin Chen, Tse-An Chen, Din Ping Tsai, Takuo Tanaka, Ta-Jen Yen
Article
Chemistry, Multidisciplinary
Abhishek Dubey, Ragini Mishra, Yu-Hung Hsieh, Chang-Wei Cheng, Bao-Hsien Wu, Lih-Juann Chen, Shangjr Gwo, Ta-Jen Yen
Article
Multidisciplinary Sciences
Tse-An Chen, Meng-Ju Yub, Yu-Jung Lu, Ta-Jen Yen
Summary: This study demonstrates a non-resonant perfect absorber comprised of alternating layers of magnesium fluoride and chromium, which can efficiently absorb light in a broad wavelength range, with advantages of simplified manufacturing process, polarization independence, and wide incidence angle.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Hao-Yu Lan, Yu-Hung Hsieh, Zong-Yi Chiao, Deep Jariwala, Min-Hsiung Shih, Ta-Jen Yen, Ortwin Hess, Yu-Jung Lu
Summary: Monolayer transition metal dichalcogenides have low total absorption of photons, hindering the realization of high-performance optoelectronic functionalities. Gate-tunable plasmonic photoFETs show potential for enhancing photoresponsivity and photocurrent in monolayer MoS2, providing a systematic methodology for designing ultrathin plasmon-enhanced photodetectors for future compact optoelectronic devices.
Article
Chemistry, Multidisciplinary
Abhishek Dubey, Ragini Mishra, Chang-Wei Cheng, Yu-Ping Kuang, Shangjr Gwo, Ta-Jen Yen
Summary: In the field of life science, rapid mutation detection in oligonucleotides is crucial for genomic and medical screening. Utilizing an epitaxial aluminum deep-UV SERRS substrate, researchers have successfully obtained SERRS spectra for all bases of oligonucleotides for the first time, demonstrating significant enhancements in Raman signals and the ability to quantify single-base mutations in ss-DNA.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Nanoscience & Nanotechnology
Tse-An Chen, Yu-Cheng Chou, Tsung-Yu Huang, Yu-Jung Lu, Yu-Ping Kuang, Ta-Jen Yen
Summary: This study demonstrates a new method of using all-dielectric Huygens' metasurface (ADHMS) in the near-ultraviolet (NUV) regime, achieving powerful wavefront engineering and an 11-degree beam deflection by modulating the diameter of nanodisks to control the electromagnetic field.
ACS APPLIED NANO MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Tse-An Chen, Ieng-Wai Un, Chih-Chung Wei, Yu Jung Lu, Din Ping Tsai, Ta-Jen Yen
Summary: Hyperbolic metamaterials (HMMs) have remarkable electromagnetic properties and find various applications. Effective medium theory (EMT) is commonly used to predict their optical properties, but it only works in specific conditions. By studying the dispersion of surface states in planar one-dimensional HMMs, a more rigorous interpretation was achieved for potential sensing applications.
ACS APPLIED NANO MATERIALS
(2021)
