Review
Engineering, Electrical & Electronic
Utpal Dey
Summary: Nondestructive, contactless, and label-free characterization of small particles plays a vital role in laboratory research and industrial manufacturing. Although optical spectroscopy can provide information about the shape and material of small particles, the value of using electromagnetic waves for this purpose requires further research and development.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Physics, Applied
V. M. Muravev, A. Shuvaev, A. S. Astrakhantseva, P. A. Gusikhin, I. V. Kukushkin, A. Pimenov
Summary: We have devised an electronically controllable plasmonic modulator based on GaAs semiconductor technology, capable of changing the phase of the transmitted electromagnetic wave. We demonstrated its phase tunability up to 41 degrees at an insertion loss of -2.2 dB. The phase shifter operates at frequencies up to 0.27 THz and temperatures up to 80 K, with the potential for scalability to a planar phased array.
APPLIED PHYSICS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Tianyu Yang, Can Ding, Richard W. Ziolkowski, Y. Jay Guo
Summary: A novel terahertz photonic crystal fiber is designed to achieve single-polarization single-mode propagation over an ultra-wide bandwidth. By introducing specific structures and materials, the designed fiber exhibits large loss difference values greater than 9.4 dB/cm, covering a spectrum of 0.64 THz, the widest achieved to date in the field of terahertz communications.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Multidisciplinary
Faeez Masurkar, Kim Ming Ng, Peter W. Tse, Nitesh P. Yelve
Summary: The article introduces an innovative optical system designed to measure the inherent nonlinearity of rail specimens by generating narrowband Rayleigh waves. The system is able to effectively produce and measure Rayleigh waves on rail tracks, aiding in the diagnosis of the health status of rail specimens. Experimental results show good agreement with a physics-based nonlinearity equation, demonstrating the system's effectiveness in assessing rail integrity.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2021)
Article
Physics, Applied
A. S. Astrakhantseva, A. Shuvaev, P. A. Gusikhin, A. Pimenov, I. Kukushkin, V. M. Muravev
Summary: We studied the terahertz response of a dielectric membrane with a high-mobility two-dimensional electron system (2DES). The developed device exhibits electromagnetic transparency above the plasma frequency determined by the 2DES density and membrane thickness. Our results demonstrate highly tunable opacity in the low-frequency region, with potential applications in active terahertz devices.
APPLIED PHYSICS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Xin Li, D. N. Wang
Summary: A whispering-gallery mode microsphere resonator based on optical fiber with an open microcavity is demonstrated, utilizing femtosecond laser micromachining and fusion splicing techniques. The device can be constructed in either single-mode fiber or multimode fiber, with insertion loss of approximately 13.2 dB and 21.0 dB, and quality factors of 4.81X10(3) and 2 X10(5) respectively. It is expected to have many photonics applications due to its compact structure, low cost, easy fabrication, convenient operation, and high durability.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Jian Zhou, Shuchang Gu, Zikai Chen, Bowen Lou, Yuyuan Jiang, Junqing Zhao, Lei Li, Dingyuan Tang, Deyuan Shen, Lei Su, Luming Zhao
Summary: The study demonstrates the shedding of scalar soliton rains from vector square-wave noise-like pulses in a fiber laser system, through the use of microfiber-knot-resonator (MKR). The MKR-induced energy transferring effect results in the co-existence of scalar and vector pulses, enriching the dynamics of optical pulses and extending the applications of MKR to pulse manipulations.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Computer Science, Information Systems
Shuai Yang, Xinzhi Sheng, Guozhong Zhao, Shuqin Lou, Jiaoyan Guo
Summary: An antiresonant hollow core effective single-mode terahertz fiber was proposed and successfully fabricated using a 3D printer with photosensitive resin. By optimizing the cladding structure parameters, a higher order mode extinction ratio (HOMER) of above 6 can be achieved. The experimental results showed that the fiber sample had low transmission loss and a Gaussian profile electric field distribution, meeting the single-mode requirements.
Article
Optics
Wenhe Jia, Meng Liu, Yongchang Lu, Xi Feng, Qingwei Wang, Xueqian Zhang, Yibo Ni, Futai Hu, Mali Gong, Xinlong Xu, Yuanyuan Huang, Weili Zhang, Yuanmu Yang, Jiaguang Han
Summary: This study demonstrates the potential of generating broadband terahertz radiation through surface optical rectification on a simple 19 nm-thick indium tin oxide thin film. The enhancement of the generated terahertz signal is observed when the pump laser is tuned around the epsilon-near-zero region of the film. This work opens up new avenues for broadening the bandwidth of terahertz generation in subwavelength thin films made of ENZ materials.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Optics
Junichi Hamazaki, Yoh Ogawa, Tadashi Kishimoto, Shin'ichro Hayashi, Norihiko Sekine, Iwao Hosako
Summary: In this study, we demonstrate wavelength conversion for terahertz (THz) wave generation using different types of waveguide structures under similar experimental conditions. Compared to bulk periodically poled lithium niobate (bulk-PPLN), the ridge-type/bulk periodically poled lithium niobate (RT-/bulk-PPLN) shows significantly higher conversion efficiency and improved performance.
Article
Engineering, Electrical & Electronic
Kaile Li, Jianguo Yu
Summary: This tutorial introduces the key technologies and principles of ultrahigh speed and large capacity THz-wave signal transmission, including photonics-aided THz-wave generation technology, new progress in optical frequency combs and optical modulators, and the application of DSP technology for heterodyne detection and multidimensional multiplexing technology.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Abbas Hamouleh-Alipour, Ali Mir, Ali Farmani
Summary: The thermo-optic mechanism for plasmonics sensing of terahertz radiations in Graphene/SiO2 metasurface is investigated numerically and analytically at room temperature. A very compact footprint for nanosensor applications is proposed, with high sensitivity and figure of merit. The study also explores tunable optical properties of graphene at different temperatures and the relationship between temperature variation and structure performance.
IEEE SENSORS JOURNAL
(2021)
Article
Biotechnology & Applied Microbiology
Ziyi Zhang, Yangmei Li, Zuoxian Xiang, Yindong Huang, Ruixing Wang, Chao Chang
Summary: In this study, we demonstrated for the first time the spatially resolved dielectric spectrum of the phospholipid bilayer in a wide range from terahertz to mid-infrared using atomistic molecular dynamics simulations and numerical calculations. The results showed the differences in permittivities between the head and tail regions, as well as the advantageous propagation characteristics of the phospholipid bilayer in the 55-85 THz band.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Vahid Sharif, Hassan Pakarzadeh
Summary: This paper proposes a novel hollow-core optical fiber for guiding high-order OAM modes in the THz region, consisting of circular air-hole arrays. Numerical simulations demonstrate that the fiber can guide OAM modes in two low-loss transmission windows from 0.47 to 0.65 THz and 0.95 to 1.20 THz with low dispersion, low loss, and high modal purity.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Hiroshi Takahashi, Tomokazu Oda, Yusuke Koshikiya
Summary: This paper focuses on the spectral manipulation of Brillouin gain in two-mode few-mode fiber (FMF) by utilizing modal Brillouin interaction. Experiments demonstrated accurate measurement of the desired intra-modal Brillouin gain spectrum with reduced influence from inter-modal crosstalk.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Physics, Applied
Gunwu Ju, Byung Hoon Na, Kwangwook Park, Hyeong-Yong Hwang, Young-Dahl Jho, NoSoung Myoung, Sang-Youp Yim, Hyung-jun Kim, Yong Tak Lee
JAPANESE JOURNAL OF APPLIED PHYSICS
(2018)
Article
Chemistry, Multidisciplinary
Ruiqiang Guo, Young-Dahl Jho, Austin J. Minnich
Article
Optics
Ji-Eon Park, Tae-young Jeong, Young-Dahl Jho, Geon-Hee Kim, Ki-Ju Yee
Article
Polymer Science
Inhong Kim, Ji-Eun Jung, Woojin Lee, Seongho Park, Heedae Kim, Young-Dahl Jho, Han Young Woo, Kwangseuk Kyhm
Article
Crystallography
Mun-Do Park, Jung-Wook Min, Jun-Yeob Lee, Hyeong-Yong Hwang, Cihyun Kim, Seokjin Kang, Chang-Mo Kang, Jeong-Hwan Park, Young-Dahl Jho, Dong-Seon Lee
JOURNAL OF CRYSTAL GROWTH
(2019)
Article
Physics, Multidisciplinary
C. J. Ho, J. A. Devlin, I. M. Rabey, P. Yzombard, J. Lim, S. C. Wright, N. J. Fitch, E. A. Hinds, M. R. Tarbutt, B. E. Sauer
NEW JOURNAL OF PHYSICS
(2020)
Article
Multidisciplinary Sciences
Bo Sun, Shanyuan Niu, Raphael P. Hermann, Jaeyun Moon, Nina Shulumba, Katharine Page, Boyang Zhao, Arashdeep S. Thind, Krishnamurthy Mahalingam, JoAnna Milam-Guerrero, Ralf Haiges, Matthew Mecklenburg, Brent C. Melot, Young-Dahl Jho, Brandon M. Howe, Rohan Mishra, Ahmet Alatas, Barry Winn, Michael E. Manley, Jayakanth Ravichandran, Austin J. Minnich
NATURE COMMUNICATIONS
(2020)
Article
Quantum Science & Technology
N. J. Fitch, J. Lim, E. A. Hinds, B. E. Sauer, M. R. Tarbutt
Summary: Measurements of the electron's electric dipole moment (eEDM) can be significantly improved using ultracold YbF molecules, which can generate precise molecular beams through techniques such as magnetic focussing and laser trapping. Noise reduction and systematic effect control are important considerations in reaching the shot-noise limit of sensitivity for eEDM measurements.
QUANTUM SCIENCE AND TECHNOLOGY
(2021)
Article
Quantum Science & Technology
X. Alauze, J. Lim, M. A. Trigatzis, S. Swarbrick, F. J. Collings, N. J. Fitch, B. E. Sauer, M. R. Tarbutt
Summary: Two-dimensional transverse laser cooling is utilized to create an ultracold YbF molecule beam, significantly increasing brightness and allowing for precise experiments with a statistical precision better than 10(-30) e cm, particularly for measuring the electron electric dipole moment.
QUANTUM SCIENCE AND TECHNOLOGY
(2021)
Article
Physics, Applied
Hun Lee, Sehyuk Lee, Soonsung So, Sang-Hyuk Park, Austin J. Minnich, Joo-Hyoung Lee, Young-Dahl Jho
Summary: Thermal metamaterials, particularly the use of acoustic Bragg reflectors (ABR), have shown promising potential in modifying conductive heat flux. In this study, we demonstrate the use of tandem ABR layers to significantly improve the anisotropy of thermal conductivity in HfO2/SiO2 superlattices.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Sang-Hyuk Park, Hun Lee, Sehyuk Lee, Austin J. Minnich, Woo-Lim Jeong, Dong-Seon Lee, Soon-Sung So, Joo-Hyoung Lee, Young Min Song, Young-Dahl Jho
Summary: In this study, the thermal boundary conductivity (TBC) between graphene and GaN-based LEDs was manipulated through thermal annealing, with a significant enhancement in interfacial coupling rate observed around 200°C. By extracting parameters such as phonon reflection coefficients, it is possible to evaluate and improve the heat dissipation efficiency of LEDs.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Hyeong-Yong Hwang, Sehyuk Lee, Yong-Hoon Kim, Farman Ullah, Chinh Tam Le, Yong Soo Kim, Ki-Ju Yee, Christopher J. Stanton, Young-Dahl Jho
Summary: In two-dimensional transition metal dichalcogenides, strain modulation can manipulate electronic band structures and photoluminescence. A novel method of external bending is used to control the photoluminescence in monolayer WSe2-MoSe2 lateral heterostructures, where both normal strain and shear strain are involved. The dependence of the photoluminescence on bending direction and the violation of optical selection rules under tensile bending are observed, which indicates the mixing of spin subbands induced by shear strain.
Article
Chemistry, Physical
Woo-Lim Jeong, Sang-Hyuk Park, Young-Dahl Jho, Soo-Kyung Joo, Dong-Seon Lee
Summary: The insertion of an intermediate layer between the CZTSSe absorber film and the Mo back contact in Cu2ZnSn(S,Se)(4) (CZTSSe) solar cells has been demonstrated to enhance conversion efficiency. Among the candidates for this intermediate layer, chemically reduced graphene oxide (GO) showed excellent properties, such as high-charge mobility and low processing cost.
Article
Nanoscience & Nanotechnology
Hyeong-Yong Hwang, Hyeonjun Baek, Gyu-Chul Yi, Young-Dahl Jho
Summary: Strain occurs spontaneously at the interfaces of crystalline materials and needs a suitable characterization scheme to analyze multiple interfaces. Through the experiment, we found that surface strain has a stronger influence on photoluminescence spectra than quantum confinement effect. Particularly in the strongly tapered region, increasing surface strain leads to a significant increase in photoluminescence shift, which matches the analysis based on surface to volume ratio. Additionally, surface strain dependence on temperature contrasts with the temperature-invariant characteristics of quantum confinement.
Article
Physics, Multidisciplinary
Yunheung Song, Jongseok Lim, Jaewook Ahn
PHYSICAL REVIEW RESEARCH
(2020)