Article
Physics, Applied
Riad Yahiaoui, Zizwe A. Chase, Chan Kyaw, Eric Seabron, Jay Mathews, Thomas A. Searles
Summary: The research demonstrates a single-layer THz metadevice that can achieve cross polarization transmission and asymmetric transmission in the THz range. The transmission characteristics change with the conductivity of the material VO2, and a promising method for active sub-cycle dynamic tunability for THz polarization conversion using optical, electrical, or thermal switching is proposed.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Applied
Duong Thi Ha, Dinh Ngoc Dzung, Nguyen Van Ngoc, Bui Son Tung, Thanh Son Pham, YoungPak Lee, Liang Yao Chen, Bui Xuan Khuyen, Vu Dinh Lam
Summary: The research demonstrates a multifunctional metamaterial structure that can achieve absorption and polarization conversion functions efficiently in different modes. Through numerical studies and dimensional adjustments, a foundation is laid for further research and development.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Multidisciplinary Sciences
Saeedeh Ahadi, Mohammad Neshat, Mohammad Kazem Moravvej-Farshi
Summary: The study proposes a terahertz modulator based on split-ring resonators, achieving signal modulation through adjustment of bias voltage. The modulator excites LC resonances or dipole resonances at different frequencies under different voltages, with modulation depths reaching 45% to 87%.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Electrical & Electronic
Anbuselvi Mathivanan, Saravanan Palani
Summary: This article reports the design and characterization of a multiband THz metamaterial with frequency-selective property and symmetric configuration. The proposed metamaterial is suitable for THz imaging and spectroscopy applications.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Wei-Nan Shi, Yi-Ming Wang, Fei Fan, Jia-Yue Liu, Jie-Rong Cheng, Xiang-Hui Wang, Sheng-Jiang Chang
Summary: Chirality is important in biological processes and enantiomers have similar physical properties and different physiological functions. This study developed a polarization detection method using a metasurface composed of asymmetric rings and gold nanoparticles for enhanced chiral detection. The experiment showed that the metasurface with gold nanoparticles achieved significant improvement in frequency shifts caused by nearfield interaction, leading to a detection limit and precision of 10(-5) g ml(-1). Additionally, polarization sensing using circular polarization, elliptical angle, and rotation angle successfully distinguished the enantiomers of three drugs, with a maximum difference of over 30° and a precision of 6.6 x 10(-7) g mL(-1). This study provides an efficient strategy for highly sensitive detection of enantiomers using THz polarization sensing and GNP enhancement.
Article
Multidisciplinary Sciences
Thi Minh Nguyen, Dinh Lam Vu, Thi Quynh Hoa Nguyen, Jung-Mu Kim
Summary: This study proposes a design for a reconfigurable metasurface with high-efficiency cross-polarization conversion and nearly perfect absorption. The reversible insulator-to-metal phase transition of Vanadium dioxide is utilized to switch between different functions, and the wideband and high-efficiency performance is maintained for a wide incident angle.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Electrical & Electronic
Khwanchai Tantiwanichapan, Habibe Durmaz
Summary: The article introduces the use of THz plasmonics and subwavelength scale artificial structures to detect residual herbicides/pesticides. Experimental results show that the THz MMA platform can detect herbicides/pesticides down to 5 ppm. This suggests that the THz MMA platform could be an important method for highly sensitive THz applications.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Materials Science, Multidisciplinary
Binghui Li, Yu-Sheng Lin
Summary: We introduce four types of tunable terahertz metamaterials made of split-ring resonators (SRRs) with different splits and inner movable structures. These designs can achieve different tuning ranges in transverse electric (TE) and transverse magnetic (TM) modes, exhibiting polarization-dependent and polarization-independent characteristics. By increasing the height of the inner movable structure, the resonant frequency of the metamaterials can be tuned. These designs possess anti-vibration and tunable characteristics, which make them potential candidates for high tunability, flexibility, and applicability in THz-wave optoelectronic devices.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Nanoscience & Nanotechnology
Eleni Perivolari, Vassili A. Fedotov, Janusz Parka, Malgosia Kaczmarek, Vasilis Apostolopoulos
Summary: This study investigates the Babinet complementary patterns of a liquid crystal-loaded metamaterial and finds that the sensitivity to refractive index variations differs for the two complementary patterns. Furthermore, the experimental data show that it is possible to shift the resonance beyond the alignment mismatch limit.
Article
Nanoscience & Nanotechnology
Kento Sato, Takehito Suzuki
Summary: Metasurfaces can manipulate terahertz waves in flat optics, but their anisotropic material properties and limited functionalities have hindered their widespread adoption. In this study, an isotropic metasurface with polarization-independent material properties was developed, exhibiting a high refractive index, low reflectance, and high transmittance at a specific frequency. Measurements confirmed its effectiveness with any polarization direction and its unprecedented material characteristics. The proposed metasurface holds promise for applications in 6G communications, offering attractive functionalities such as wavefront control and directivity enhancement.
Article
Multidisciplinary Sciences
Sukhvinder Kaur, Subhajit Karmakar, Arun Jana, Shreeya Rane, Ravendra Kumar Varshney, Dibakar Roy Chowdhury
Summary: The control and manipulation of cavity resonances can be achieved through modifying the split ring resonator geometry in hybrid plasmonic metasurface, leading to the excitation of dual resonance peaks with high quality factor and multi-band resonances.
Article
Materials Science, Multidisciplinary
Paul Goulain, Chris Deimert, Mathieu Jeannin, Stefano Pirotta, Wojciech Julian Pasek, Zbigniew Wasilewski, Raffaele Colombelli, Jean-Michel Manceau
Summary: Continuously graded parabolic quantum wells are used to overcome the limitations of square quantum wells at terahertz frequencies. Microcavity intersubband polaritons are formed at frequencies as low as 1.8 THz, with ultra-strong coupling sustained up to 200 K. The use of sub-wavelength resonators preserves the ultra-strong coupling regime, making it a potential approach for generating non-classical light.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Optics
Gian Paolo Papari, Anna Lucia Pellegrino, Graziella Malandrino, Antonello Andreone
Summary: In this study, an open cavity operating in the THz regime was constructed using two layers of VO2 thin films. By utilizing the phase transition of VO2, the system can switch between a high transmission mode and a high sensitivity to refractive index changes. The structure showed promising results as a comb-like spectrum sensor with adjustable cavity length and optimized resonances.
Article
Multidisciplinary Sciences
Sangeeta Sharma, Peter Elliott, Samuel Shallcross
Summary: This study demonstrates that a hencomb pulse, which combines circularly polarized optical frequency pulse and linearly polarized THz pulse, can generate precisely tailored spin currents and valley currents in 2D materials. The control over these currents can be achieved by tuning the frequency and polarization vector of the light components. This result opens up a pathway for light control over spin/valley current states at ultrafast times.
Article
Optics
Liwei Zhang, Wanfang Liu, Pablo Cencillo-Abad, Qin Wang, Xing Huang, Yumin Leng
Summary: A broadband tunable metamaterial absorber that is insensitive to polarization and angle for terahertz frequencies is proposed. The absorber consists of a dielectric layer, wheel-shaped vanadium dioxide (VO2) inclusions, and a Dirac semimetal (DS) backplane. Numerical simulations show that the absorption performance can be adjusted by changing various parameters, achieving an ultra-wideband absorptance of over 90% from 4.04 THz to 9.41 THz. The absorber possesses polarization-independence, wide-angle tolerance, and a high sensitivity for refractive index changes. It has potential applications in terahertz energy harvesting, sensing, and modulation.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Yuzhi Shi, Yongfeng Wu, Lip Ket Chin, Zhenyu Li, Jingquan Liu, Mu Ku Chen, Shubo Wang, Yi Zhang, Patricia Yang Liu, Xiaohong Zhou, Hong Cai, Wanzhen Jin, Yefeng Yu, Ruozhen Yu, Wei Huang, Peng Huat Yap, Limin Xiao, Wee Ser, Thi Thanh Binh Nguyen, Yu-Tsung Lin, Pin Chieh Wu, Jiayan Liao, Fan Wang, C. T. Chan, Yuri Kivshar, Din Ping Tsai, Ai Qun Liu
Summary: This study demonstrates a multifunctional virus manipulation technique that enables efficient trapping and manipulation of arbitrary number of viruses. Enhanced optical forces are produced by fine tuning of interference resonances in engineered arrays of nanocavities, allowing trapping and manipulation of viruses as small as 40 nm. This technique opens up new opportunities for studying virus pathogenesis and inhibitor development.
LASER & PHOTONICS REVIEWS
(2022)
Article
Multidisciplinary Sciences
H. H. Zhu, J. Zou, H. Zhang, Y. Z. Shi, S. B. Luo, N. Wang, H. Cai, L. X. Wan, B. Wang, X. D. Jiang, J. Thompson, X. S. Luo, X. H. Zhou, L. M. Xiao, W. Huang, L. Patrick, M. Gu, L. C. Kwek, A. Q. Liu
Summary: Large-scale, highly integrated, and low-power-consuming hardware is crucial for optical neural networks to achieve advanced optical computing. Traditional experimental implementations have limited scalability and consume excessive power. This study proposes an integrated diffractive optical network (IDNN) that utilizes two ultracompact diffractive cells and a small number of MZIs to perform parallel Fourier transforms, convolution operations, and application-specific optical computing. The footprint and energy consumption of the IDNN scale linearly with the input data dimension, resulting in significant reductions compared to traditional MZI-based ONNs. Experimental results on MNIST and Fashion-MNIST datasets demonstrate a similar level of accuracy and approximately 10-fold reduction in footprint and energy consumption. The IDNN chip shows promising potential for scalable and low-power-consumption optical computational chips for optical artificial intelligence.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Jin Qin, Shibin Jiang, Zhanshan Wang, Xinbin Cheng, Baojun Li, Yuzhi Shi, Din Ping Tsai, Ai Qun Liu, Wei Huang, Weiming Zhu
Summary: Metasurfaces are 2D artificial materials that can manipulate light at the subwavelength scale. Compared to traditional micro/nano-optical sensors, Metasurfaces have better performance in label-free sensing and recognition of complex samples, and also have the advantage of high integration.
Article
Physics, Applied
S. Sarkar, E. Nefzaoui, G. Hamaoui, F. Marty, P. Basset, T. Bourouina
Summary: This study explores the effect of surface doping on the radiative properties and absorptance of black silicon (BSi), and proposes a phenomenological explanation based on the dopant concentration profiles and the corresponding incident radiation penetration depth. The experimental results provide simple design rules for using ion-implanted BSi in various applications such as solar energy harvesting, thermo-photovoltaics, and infrared radiation sensing.
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
Hui Zhang, Jonathan Wei Zhong Lau, Lingxiao Wan, Liang Shi, Yuzhi Shi, Hong Cai, Xianshu Luo, Guo-Qiang Lo, Chee-Kong Lee, Leong Chuan Kwek, Ai Qun Liu
Summary: This study demonstrates the capability of photonic neural networks in predicting the quantum mechanical properties of molecules and shows that multiple properties can be learned simultaneously in a photonic chip through a multi-task regression learning algorithm. It is the first application of photonics technology in machine learning for computational chemistry and molecular sciences, such as drug discovery and materials design, which is of great significance.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Cong Xiong, Wei Jiang, Caoyuan Wang, Ruowei Yu, Jun He, Runxiao Chen, Xuan Li, Kang Ying, Haiwen Cai, Aiqun Liu, Limin Xiao
Summary: The nanobore fiber (NBF) is a promising nanoscale optofluidic platform with long nanochannels and unique optical properties. In this study, NBF-based fiber Bragg gratings (FBGs) were introduced using femtosecond (fs) laser direct writing or ultraviolet (UV) laser phase mask techniques for the first time. The optimized UV laser fabricated FBG achieved a high reflectivity of 96.89% while preserving the open nanochannel. The NBF-based FBGs showed high potential for nanofluidic applications.
Article
Chemistry, Multidisciplinary
Ahmed M. Othman, Ahmed A. Elsayed, Yasser M. Sabry, Diaa Khalil, Tarik Bourouina
Summary: Microplastics are a type of particulate water contaminants that have raised concerns due to their potential environmental and health effects. This study aims to quickly gather information about the population of identical microplastic particles, including their chemical nature and size below 20 μm, through a single spectrum acquisition. The researchers built a compact setup for attenuated total reflection Fourier transform infrared (ATR-FTIR) and Raman spectroscopy measurements on the same sample, and found that ATR-FTIR was more sensitive to particles of 6 μm in size, while Raman spectroscopy showed the opposite trend. The study also used theoretical modeling to explain the ripples observed in the spectra, which can serve as an indicator of microparticle dimension.
Article
Chemistry, Multidisciplinary
Ahmed A. Elsayed, Ahmed M. Othman, Yasser M. Sabry, Frederic Marty, Haitham Omran, Diaa Khalil, Ai-Qun Liu, Tarik Bourouina
Summary: In Raman analysis, the substrate material can enhance or interfere with the signal depending on its properties. By tilting the supporting substrate, the Raman signal of the substrate material, in this case, silicon, can be drastically reduced, making it easier to observe the target analyte, such as microplastic particles.
Article
Chemistry, Analytical
Alaa Fathy, Martine Gnambodoe-Capochichi, Yasser M. Sabry, Momen Anwar, Amr O. Ghoname, Ahmed Saeed, Yamin Leprince-Wang, Diaa Khalil, Tarik Bourouina
Summary: A low-cost multi-parameter gas analyzer capable of monitoring multiple gaseous pollutants simultaneously was introduced. It is a small spectral sensor based on a Fourier-transform infrared (FTIR) gas analyzer. The sensor was successfully deployed in a district-scale climatic chamber and accurately measured carbon dioxide (CO2) and water vapor (H2O).
Review
Optics
Wei Luo, Lin Cao, Yuzhi Shi, Lingxiao Wan, Hui Zhang, Shuyi Li, Guanyu Chen, Yuan Li, Sijin Li, Yunxiang Wang, Shihai Sun, Muhammad Faeyz Karim, Hong Cai, Leong Chuan Kwek, Ai Qun Liu
Summary: Recent years have seen significant progress in quantum communication and quantum internet through the use of quantum photonic chips, which offer scalability, stability, and low cost in a compact form. This article provides an overview of the advancements in quantum photonic chips for quantum communication, including the main fabrication platforms and key components. It discusses various applications such as quantum key distribution and quantum teleportation. The article also highlights the challenges for achieving high-performance chip-based quantum communication and provides insights into future opportunities for integrated quantum networks.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Chemistry, Physical
Harsh A. Chaliyawala, Steiphane Bastide, Diane Muller-Bouvet, Christophe Pichon, Kadiatou Bah, Anffane Djoumoi, Freideiric Marty, Tarik Bourouina, Encarnacioin Torralba
Summary: In this study, one-step synthesis of AgxCu100-x bimetallic nanoparticles (NPs) on p-type silicon (p-Si) supports is reported, and their application as photocathodes for the photoelectrochemical CO2 reduction reaction (PEC-CO2RR) is explored. The proposed method allows for the homogeneous distribution of NPs on the Si surface, with excellent control of their bimetallic composition, surface coverage, and morphology. The Ag50Cu50/p-Si photocathode shows better performance than Ag/p-Si and Cu/p-Si, achieving CO2 conversion to CO and CH4 with high Faradaic efficiency at lower overpotentials.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Optics
Yuan Shen, Wai-Keong Mok, Changsuk Noh, Ai Qun Liu, Leong-Chuan Kwek, Weijun Fan, Andy Chia
Summary: This article proposes a new approach to quantum synchronization by using an approximate model of the Duffing-van der Pol oscillator. It captures interesting phenomena in the deep-quantum strongly nonlinear regime, such as amplitude death on resonance and nonlinearity-induced position correlations.
Article
Materials Science, Multidisciplinary
Sreyash Sarkar, Ahmed A. A. Elsayed, Yasser M. M. Sabry, Frederic Marty, Jeremie Drevillon, Xiaoyi Liu, Zhongzhu Liang, Elodie Richalot, Philippe Basset, Elyes Nefzaoui, Tarik Bourouina
Summary: The properties of black silicon are investigated in the mid-infrared wavelength range, with unprecedented levels of light absorption achieved. The experimental findings demonstrate that increasing the initial level of doping of bare silicon can significantly enhance both absorptance and spectral range. The synergistic effects of morphology and volume doping, particularly the role of high aspect-ratio conical nanostructures, are elucidated.
ADVANCED PHOTONICS RESEARCH
(2023)
Article
Chemistry, Analytical
Ahmed M. Othman, Yasser M. Sabry, Diaa Khalil, Tarik Bourouina
Summary: In this study, the size and chemical nature of spherical microparticle populations with diameters larger than 1 μm were simultaneously identified using attenuated total reflection-Fourier transform infrared spectroscopy. The method was validated on different diameter microplastic particles and Saccharomyces cerevisiae yeast cells, providing accurate measurements and calculations.
ANALYTICAL CHEMISTRY
(2023)
