Article
Physics, Applied
Bowen Tan, Xingcheng Xiang, Longcheng Feng, Shengxin Yang, Wei Zhang, Caihong Zhang, Jingbo Wu, Kebin Fan, Biaobing Jin, Jian Chen, Huabing Wang, Peiheng Wu
Summary: The study focuses on enhancing terahertz surface plasmon polaritons (SPPs) and generating subwavelength-sized focal spots using an asymmetrical circular groove structure with controlled propagation phase of SPPs. The feasibility of the designed structure was verified by imaging the THz SPPs and comparing with simulation results using a THz real-time near-field spectral imaging system. This study is of great significance for the application of THz SPPs and the fabrication of related devices.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Yumin Gong, Baogang Quan, Fangrong Hu, Longhui Zhang, Mingzhu Jiang, Shangjun Lin
Summary: This study experimentally demonstrates a graphene metasurface for THz field enhancement by adjusting the conductivity of the graphene patch. The results show enhancement of the THz field and provide a foundation for exploring THz-matter interactions and nonlinear optics.
Article
Nanoscience & Nanotechnology
Jeeyoon Jeong, Dai-Sik Kim, Hyeong-Ryeol Park
Summary: Metallic nanogaps are widely used for sensing applications due to their ability to confine and enhance electromagnetic field within the hot spots. This study extends the concept of near field absorption enhancement by analyzing the terahertz absorption behavior of water molecules outside the hot spots of sub-20 nm-wide nanotrenches. The findings provide means to quantitatively analyze light-matter interactions beyond the hot spot picture and enable the application of nanogaps for sensitive surface analyses.
Article
Physics, Applied
Xueqi Bai, Peng Bai, Xiaohong Li, Siheng Huang, Xinran Lian, Wenjun Song, Zhiwen Shi, Wenzhong Shen, Yueheng Zhang
Summary: This study introduces two types of QWPs based on antenna-coupled microcavity structures, improving coupling efficiency and achieving high-performance multi-color THz detection.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Optics
Yinghui Ren, Xiaogang Wang, Chijie Xiao
Summary: To address the issue of high attenuation in terahertz wave propagation in air, a split ring resonator (SRR) structure is proposed. It consists of a subwavelength slit and a circular cavity to support coupling resonant modes and achieve a remarkable omnidirectional electromagnetic signals gain at 0.4 THz. Additionally, a new analytic approach based on the Bruijn method is developed to predict field enhancement dependence on key geometric parameters of the SRR, paving the way for direct detection and transmission of enhanced THz signals in future communication systems.
Article
Engineering, Electrical & Electronic
Yucheng Liu, Weihao Liu, Qika Jia, Baogen Sun, Jun Chen
Summary: This article introduces an enhanced TLD boosted by resonant cavities, which significantly increases the quality factor of the resonant modes and enhances the output power by more than an order of magnitude. Furthermore, by changing the shape of the cavity, the operation modes and frequency of the TLD can be adjusted, allowing for efficient operation with high-order modes and increasing the output frequency without increasing machining difficulty, which is beneficial for developing high-power and high-frequency free-electron THz sources.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Materials Science, Multidisciplinary
Myonghoo Hwang, Semin Jo, Jae-Woo Baek, Wonwoo Lee, Kyung-Young Jung, Hojin Lee, Bongjun Yeom
Summary: The lithography-free fabrication of terahertz chiral metamaterials is achieved by combining two-step buckling processes and glancing-angle deposition. The manufactured chiral metamaterials exhibit mirror-shaped terahertz circular dichroism (TCD) signals in the range of 0.2-2.5 THz. The enhancement of sensing the chirality of biocrystal enantiomers is attributed to the synergistic effects of superchiral field enhancement and the electromagnetic resonance between the CHAMs and biocrystals.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Riad Yahiaoui, Zizwe A. Chase, Chan Kyaw, Fuyang Tay, Andrey Baydin, G. Tim Noe, Junyeob Song, Junichiro Kono, Amit Agrawal, Motoaki Bamba, Thomas A. Searles
Summary: By enhancing the cooperation between atoms on a terahertz metasurface, strong coupling and ultrasensitive sensing required in quantum information technology can be achieved.
Article
Optics
Alaa Jabbar Jumaah, Hartmut G. Roskos, Shihab Al-Daffaie
Summary: Antenna-coupled photomixers are important components in coherent optoelectronic THz systems. By using interdigital graphene electrodes instead of metal fingers, the responsivity of planar receivers based on low-temperature-grown GaAs can be enhanced significantly, leading to an enlarged dynamic range and doubled frequency range in the detection process. These improvements are attributed to the transparency of the finger electrodes for visible/near-infrared laser radiation, which activates the area under the fingers for the mixing process.
Article
Materials Science, Multidisciplinary
Maria Cojocari, Anar K. Ospanova, Vladimir Chichkov, Miguel Navarro-Cia, Andrei Gorodetsky, Alexey A. Basharin
Summary: This study presents a numerical, theoretical, and experimental investigation of a terahertz metasurface supporting a pseudo-anapole, revealing the characteristics of the pseudo-anapole effect and its resonance suppression of multipole radiation. It also proposes a method to control the metasurface response by manipulating the electric and toroidal responses independently.
Article
Chemistry, Multidisciplinary
Yeeun Roh, Minjun Chae, Jaewon Oh, Woochul Kim, Mee-Yi Ryu, Minah Seo, Jeeyoon Jeong
Summary: Metallic nanogaps offer a versatile platform for ultrastrong coupling in terahertz frequencies. In this study, terahertz nanoslots were proposed and demonstrated to achieve ultrastrong phonon-photon coupling, even with larger gap widths. Simulation and analysis showed the potential for further optimization of nanoslots to increase the coupling efficiency.
Review
Nanoscience & Nanotechnology
Zhenzhe Ma, Peiyan Li, Sai Chen, Xiaojun Wu
Summary: Extremely nonlinear terahertz (THz)-matter interactions and applications have become the next frontier in quantum information, nonlinear optics, and particle acceleration. However, the lack of highly intense THz sources and the diffraction limit hinder the growth of extreme THz. To address this issue, researchers are developing highly concentrated THz sources and utilizing resonant artificial structures to enhance local fields.
Article
Optics
Uhood J. Al-Hamdani, Qusay M. A. Hassan, C. A. Emshary, H. A. Sultan, Adil Muala Dhumad, Afrah A. Al-Jaber
Summary: In this study, chemical computational calculations were conducted using density functional theory (DFT) to investigate the molecular structure of a synthesized compound, revealing good optical properties in agreement with experimental findings. The nonlinear refraction index (INR) of the compound was determined via two methods, and its optical limiting (OLg) properties were studied. Additionally, all optical switching technique was tested with successful results obtained, and diffraction ring patterns (DRPs) were numerically simulated based on the Fresnel-Kirchhoff integral.
Article
Physics, Multidisciplinary
Xikai Shan, Guoliang Li, Xuechun Chen, Wenwen Zheng, Wen Zhao
Summary: The increase in gravitational wave events has enabled the observation of strong lensing image pairs of gravitational waves. However, the wave effect caused by the microlens field contaminates the parameter estimation of the image pair, leading to potential misjudgment of strong lensing signals. To quantify this influence, a large sample of statistical research is required. However, the computational time of the Fresnel-Kirchhoff diffraction integral limits such studies.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2023)
Article
Engineering, Electrical & Electronic
Michael S. Shur
Summary: The terahertz (THz) technology has wide applications, with Beyond 5G Wi-Fi and Internet of Things (IoT) as its expected killer applications. Plasmonic TeraFETs with feature sizes down to 3 nm could enable a dramatic expansion of these applications.
IEEE SENSORS JOURNAL
(2021)
Article
Optics
Yongjune Kim, Duckjong Kim, Sang-Hun Lee, Minah Seo, Hyun-June Jung, Boyoung Kang, Seung-Mo Lee, Hak-Joo Lee
Article
Chemistry, Analytical
Sang-Hun Lee, Jong-Ho Choe, Chulki Kim, Sukang Bae, Jin-Soo Kim, Q-Han Park, Minah Seo
SENSORS AND ACTUATORS B-CHEMICAL
(2020)
Article
Multidisciplinary Sciences
Eui-Sang Yu, Hyojin Lee, Sun-Mi Lee, Jiwon Kim, Taehyun Kim, Jongsu Lee, Chulki Kim, Minah Seo, Jae Hun Kim, Young Tae Byun, Seung-Chul Park, Seung-Yeol Lee, Sin-Doo Lee, Yong-Sang Ryu
NATURE COMMUNICATIONS
(2020)
Article
Optics
Soo Hyun Lee, Yeeun Roh, Sang-Hun Lee, Yong-Sang Ryu, Byeong-Kwon Ju, Minah Seo
Summary: The study compared the sensing performance of terahertz time-domain spectroscopy (THz-TDS) and surface-enhanced Raman scattering (SERS) when accompanied by proper plasmonic subwavelength structures. The trade-off relationship between limit-of-detection and quenching, as well as the specificity determined by differences in spectral features, were observed. Both spectroscopic techniques show great potential for highly sensitive, reproducible, label-free, and cost-effective diagnosis tools in the biomedical fields.
Review
Nanoscience & Nanotechnology
Geon Lee, Eui-Sang Yu, Yong-Sang Ryu, Minah Seo
Summary: This review discusses the development and integration of metasurface-assisted material sensing and transportation technologies. The trend of combining optical detection and transporting schemes beyond diffraction and diffusion limits is explored, and the potential for exceptional performance in molecular detections is highlighted.
Article
Biophysics
Soo Hyun Lee, Yeon Kyung Lee, Sang-Hun Lee, Jisung Kwak, Hyun Seok Song, Minah Seo
Summary: In this study, a sensitive and selective detection of RBD peptides in SARS-CoV-2 and SARS-CoV was achieved using a terahertz time-domain spectroscopy system and metamaterial-based sensing chips, with successful discrimination between the two viruses.
BIOSENSORS & BIOELECTRONICS
(2022)
Article
Nanoscience & Nanotechnology
Geon Lee, Jinwoo Lee, Q-Han Park, Minah Seo
Summary: Label-free imaging technology is highly valued for various applications in bioengineering, medicine, and chemistry. Terahertz waves provide vibrational signatures of molecules with low photon energy and no damage to biomaterials. However, the limited sensitivity and spatial resolution of terahertz waves have been challenges. Recent advances in nanostructures and geometric beam shaping have paved the way for highly efficient real-time terahertz imaging.
Article
Multidisciplinary Sciences
Geon Lee, Sung Jun Kim, Yeeun Roh, Sang-Hun Lee, Dai-Sik Kim, Sang Woo Kim, Minah Seo
Summary: This paper reports a method to enhance the THz shielding efficiency by using nanoscale THz metamaterials and silver nanowires coated with rGO. The transmission is significantly enhanced by nanopatterns, even for ultrathin films, resulting in improved shielding performance against external THz waves.
Article
Nanoscience & Nanotechnology
Geunchang Choi, Yeeun Roh, Minah Seo
Summary: This article proposes a terahertz nanofuse that uses irreversible modulations in transmitted terahertz through nanowires-combined nanoantenna structures. Semiconductor and metal nanowires undergo irreversible reconfiguration in their geometry at an incident field of 20 kV/cm. The concept is explained by terahertz-field-induced ionization or electromigration. The nanofuse has potential applications as an optical fuse to protect sensitive terahertz devices under excessive field focus.
Article
Chemistry, Analytical
Taeyeon Kim, Jaeryong Im, Yeeun Roh, Geon Lee, Minah Seo
Summary: An advanced sensing platform utilizing terahertz metasurfaces is demonstrated for chemical detection and precise identification within an acrylic paint layer, with noticeable sensitivity reaching down to several hundreds of nanometers. The presence of internal pore defects in the paint can lead to geometric distortions, affecting the overall system state. Even for acrylic paint with identical colors, distinct discrimination and identification of chemical compositions were successfully proposed.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Yeeun Roh, Minjun Chae, Jaewon Oh, Woochul Kim, Mee-Yi Ryu, Minah Seo, Jeeyoon Jeong
Summary: Metallic nanogaps offer a versatile platform for ultrastrong coupling in terahertz frequencies. In this study, terahertz nanoslots were proposed and demonstrated to achieve ultrastrong phonon-photon coupling, even with larger gap widths. Simulation and analysis showed the potential for further optimization of nanoslots to increase the coupling efficiency.
Article
Materials Science, Multidisciplinary
Geon Lee, Yeeun Roh, Eui Young Rho, Yong-Sang Ryu, Minah Seo
Summary: This study demonstrates efficient and highly sensitive detection methods for ultrafine dust particles using terahertz resonant metasurfaces. The measured signal changes of the resonance can be modified by the deposited particle concentrations and their optical properties. The proposed method shows promise for ultrasensitive terahertz molecule sensors in detecting environmentally hazardous particulates.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Chemistry, Multidisciplinary
Jinwoo Lee, Jongsu Lee, Geon Lee, Dai-Sik Kim, Yong-Sang Ryu, Minah Seo
Summary: With the developments in nanotechnology, the combination of innovative photonic designs and functional materials provides a unique approach to acquire, share, and respond to information. A study found that depositing a 30 nm-thick palladium nanofilm on a terahertz metasurface chip allows for the tracking of gas and matter interactions, including gas adsorption, hydrogenation, metal phase changes, and water-forming reactions. Combinatorial analyses by simulation and experimental measurements demonstrate the significant impact of the nanostructures on light-matter interactions and propose methods for tracking unknown stages of water-forming reactions.
ADVANCED MATERIALS
(2023)
Article
Optics
Dahye Jang, Heonseong Ryu, Inhee Maeng, Sanggu Lee, Minah Seo, Seung Jae Oh, Sang-Hun Lee
Summary: Terahertz (THz) electromagnetic waves provide a new way to understand various phenomena, and all-dielectric THz metamaterial optics fabricated using 3D printing technology show promising performance in terms of full-wave phase controllability and focusing capability.
OPTICS AND LASERS IN ENGINEERING
(2023)
Editorial Material
Physics, Applied
Shravan Hanasoge, Noriaki Horiuchi, Congcong Huang, Hepeng Jia, Na Young Kim, Mio Murao, Minah Seo, Rebecca Tan, Jens Wilkinson
NATURE REVIEWS PHYSICS
(2020)
Article
Optics
Hang Dong, Zhixin Sun, Jingyi Li, Yahui Li, Wei Zhang, Guangyong Jin
Summary: This paper calculates thermal stresses and adsorption forces to determine laser cleaning conditions and establishes relevant models. Experimental results show that the removal effect is better with increasing nanosecond pulse delay, with the best effect achieved at 600 milliseconds pulse delay. Based on the findings, the mechanisms of oxide film removal involve thermal stress against adsorption and plasma shock wave breaking the oxide layer.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Junjie Zhang, Wenjun Li, Bingtao Li, Zheng-Da Hu, Jicheng Wang, Feng Zhang, Lei Wang
Summary: A multilayer thin film device structure based on Tamm plasmons is proposed for high-performance near-infrared hot electron photodetectors. By optimizing the device structure parameters, high responsivity detection can be achieved.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Hong Huang, Zhiguang Han
Summary: This paper proposes a new ghost imaging reconstruction method using ordered orthogonal Hadamard derived speckle as the illumination speckle series, and introduces the alternating direction multiplier method to improve the imaging performance. The evaluation results show that the method can achieve high-quality reconstructed images under low sampling conditions.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Moritsugu Sakamoto, Yuki Ono, Kohei Noda, Tomoyuki Sasaki, Nobuhiro Kawatsuki, Masayuki Tanaka, Hiroshi Ono
Summary: The effect of wavelength and polarization of illuminating light in polarization imaging for birefringent objects placed behind a scattering structure was experimentally investigated. The result shows that the spatial distribution of the birefringent object was more clearly visualized in the longer wavelength combined with circularly polarized light illumination. This finding indicates the potential of using polarization imaging with circularly polarized light illumination in the near-infrared range for visualizing birefringent objects with scattering.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Peihui Du, Hongfang Wang, Pengwei Li, Rukeyemuhan Abadula, Hmbat Batelbek, Min Gao
Summary: In this study, we theoretically demonstrate the strong coupling between Tamm plasmons and exciton polaritons in metal Al/DBR-molecular structures, extending the operating wavelength to the deep ultraviolet region. The coupling strength can be effectively manipulated by adjusting the structure parameters, offering potential benefits for the development of new-style optical filters.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Priyanka Chaudhary, Akhilesh Kumar Mishra
Summary: We design and numerically investigate the switching dynamics between two outer waveguides in a parity-time (PT)-symmetric adiabatically coupled three waveguides nonlinear directional coupler (NLDC) system. The study shows that the device can provide switching even when the middle waveguide is nonlinear and the outer waveguides are linear. Furthermore, the effect of loss to gain ratio on critical switching power and the impact of launched light power and gain (loss) value on transmitted power are also studied.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Wei Feng, Yongcong Yi, Shuyang Li, Zhi Xiong, Boya Xie, Zhen Zeng
Summary: Traditional imaging techniques are ineffective in achieving clear underwater imaging due to the presence of scattering media. Single-pixel imaging (SPI) system based on Unet++ offers a solution for reconstructing high-quality images in highly turbid water environments.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Xiaorui Qu, Jufeng Zhao, Haijun Tian, Junjie Zhu, Guangmang Cui
Summary: This paper studies the structural similarity between RGB and spectral images and proposes a non-iterative Images Structure Similarity (ISS) method for fast reconstruction of spectral images. Additionally, the input of the Deep Image Prior (DIP) method is optimized for the first time by using the initial spectral data reconstructed by ISS, leading to an improved starting value for the iteration. The experimental results show that the proposed method can enhance the reconstruction quality in both spectral and spatial resolutions, while significantly reducing the reconstruction time compared to other DIP-based methods.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Donghe Sheng, Zhe Han, Zanyang Qiao, Tianpei Dong, Chenxi Wang, Huiping Tian
Summary: In this study, a distributed multi-parameter sensor based on an etched few-mode multi-core fiber is proposed, allowing simultaneous sensing of temperature, strain, and sample refractive index. By combining space division multiplexing and stimulated Brillouin scattering, the sensor achieves high sensitivity in detecting these parameters.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Dehao Chen, Zhenwu Mo, Zehong Liang, Junjie Jiang, Huilin Tang, Yidan Sun, Ziyu Wang, Quanfeng Wei, Yanru Chen, Dongmei Deng
Summary: In this study, a novel family of elliptical Airyprime vortex beams (EAPVBs) is introduced, which inherits the excellent self-focusing properties of the circular Airyprime vortex beam (CAPVB). The asymmetric focusing of EAPVB leads to some novel properties, such as the splitting of high-order optical vortex and the formation of two foci. By taking advantage of these properties, EAPVB is constructed as a tunable optical bottle for particle capture.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Xiao Ma, Qiongchan Shao, Jian-Jun He
Summary: In this study, an SHS chip based on Su8 waveguide was designed and fabricated. By physically adjusting the metal electrodes and compensating for transmissivity fluctuations, the generation of side ripples was successfully suppressed.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Hongbin Zhang, Jiansen Du, Zongtao Chi, Hailin Cong, Bin Wang
Summary: In this paper, a novel type of dual-wavelength confocal metalens is proposed to solve the spatial crosstalk between two wavelengths. The metalens can greatly reduce the spatial crosstalk and achieve high precision and efficiency in confocal imaging. It can also focus light in specific wavelength ranges, making it suitable for imaging, microscopy, and optical fiber communication.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Rui Qiu, Guanmao Zhang, Shaokai Du, Jie Liu, Hongyu Jib, Kaiyun Bi, Bochuan Xing, Guangchao Diao
Summary: Recent research has developed an achromatic metalens that shows potential for replacing traditional lenses. This study focuses on a continuously variable focus height broadband achromatic metalens for long-wavelength infrared applications. By optimizing materials and parameters, chromatic aberration is effectively corrected, making it suitable for high-resolution LWIR imaging and spectroscopy systems.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Marcos Troncoso-Costas, Gaurav Jain, Yiming Li, Mohammed Patel, Lakshmi Narayanan Venkatasubramani, Sean O'Duill, Frank Smyth, Andrew Ellis, Francisco Diaz-Otero, Colm Browning, Liam Barry
Summary: In this work, a fast-switching tuneable laser capable of wide wavelength coverage, low noise and linewidth levels suitable for high-order modulation formats is demonstrated. The laser is characterized to cover a wavelength range of 35 nm in the C-band with nanosecond switching time. It is used to successfully demonstrate 480 Gbit/s 16QAM transmission over 25 km of single-mode fiber for a wavelength range of 19 nm.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Takeshi Moriyasu, Masahiko Tani, Hideaki Kitahara, Takashi Furuya, Jessica Afalla, Toshiro Kohmoto, Daishiro Koide, Hiroki Sato, Mitsutaka Kumakura
Summary: Optical pump-terahertz probe spectroscopy was used to study the photocarrier dynamics and optical characteristics of semiconductor Si. The results showed that the thickness of Si influenced the transmitted terahertz field amplitude and peak delay time, indicating differences in photocarrier dynamics between different Si materials.
OPTICS COMMUNICATIONS
(2024)
