Article
Physics, Applied
L. A. Tepanecatl Fuentes, I. Fuentecilla-Carcamo, J. M. Gutierrez-Villarreal, Jorge A. Gaspar-Armenta, M. A. Palomino-Ovando, G. Hernandez-Cocoletzi
Summary: This research demonstrates that a THz reflector consisting of a phosphorene (graphene)-dielectric multilayer can be analyzed using a simple effective plasma frequency model. The cutoff frequency is shown to be influenced by structural parameters and carrier density of phosphorene (graphene) layers, allowing for variability through carrier density tuning. The study also reveals a wide frequency range in the THz domain where cutoff frequency can be adjusted through carrier density tuning, enabling the design of tunable reflectors in these frequencies.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
M. A. Baqir, P. K. Choudhury
Summary: A study was conducted on an optical biosensor based on hyperbolic metamaterial (HMM) for the detection of early-stage cancer cells. The effective medium theory was used to determine the properties of the metasurface. By analyzing the reflectance under different conditions, shifts in spectral minima were observed, allowing for the determination of the measurand's status. The sensitivity and figure-of-merit (FoM) of the structure were evaluated, showing that the device has a relatively high FoM that depends on various factors.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Yizhe Liu, Fei Pan, Feng Xiong, Yuling Wei, Yicheng Ruan, Bin Ding, Kuijian Yang, Yuli Chen
Summary: This study proposes a class of 2D and 3D chiral mechanical metamaterials based on prestressed bistable metallic shells, which enables fast shape-reconfiguration with large morphing amplitude, high energy-efficiency, and ultrafast speed. The metamaterials can transform from an extended state to a rolled-up state at a transitional speed of 7.56 m/s, resulting in 25.38- and 101.14-times body area/volume variation per second for 2D and 3D metamaterials, respectively. Additionally, smart trapper and phononic structures with tunable band gaps are achieved based on these metamaterials. This work provides a straightforward platform for designing metamaterials and their derived systems with ultrafast and large-amplitude shape-reconfigurability.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Bartosz Janaszek, Anna Tyszka-Zawadzka, Pawel Szczepanski
Summary: In this paper, the potential of using a graphene-based hyperbolic metamaterial as a tunable optical power limiter and/or controllable laser noise suppressor for the terahertz frequency range is investigated. This is the first demonstration of such functionalities achieved with a voltage-controlled nonlinear hyperbolic metamaterial using graphene. The authors believe that these structures, achievable through planar deposition techniques, will have practical applications in THz systems that require optical power limiting.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Chemistry, Physical
Biyuan Wu, Derui Zhang, Cunhai Wang, Kaihua Zhang, Xiaohu Wu
Summary: This paper presents a transparent smart radiation device (TSRD) based on vanadium dioxide (VO2) and a hyperbolic metamaterial (HMM) structure. The TSRD achieves high transmission in the visible band and high reflection in the infrared due to the topological transition property of HMM. The variable emission is realized through the phase change material VO2 film.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Sha Hu, Shuo Du, Junjie Li, Changzhi Gu
Summary: The study demonstrates multidimensional switchable images and 3D integrated beam splitters based on hyperbolic metamaterials (HMMs), achieving a switchable image and a broadband beam splitter through the design of HMMs with different performance. By integrating the multidimensional beam splitter with a filter metamaterial, the separation of light by space and wavelength is further achieved.
Article
Physics, Applied
Guangwei Hu, Chunqi Zheng, Jincheng Ni, Cheng-Wei Qiu, Andrea Alu
Summary: In analogy to Lifshitz transitions in electronic systems, topological transitions have recently attracted attention in photonics, enabling exotic regimes for light-matter interactions. This study explores enhanced photonic local density of states in twisted hyperbolic bilayers, highlighting the potential applications of topological transitions in photonics for manipulating radiative heat transfer and controlling light at the nanoscale.
APPLIED PHYSICS LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Sheng-Qing Zhu, Yi Zhang
Summary: This theoretical study investigates the electromagnetic forces acting on a spherical anisotropic nanoparticle characterized by multilayer hyperbolic metamaterials (mHMMs). The study finds that the optical gradient force can be flexibly tuned by changing the incident angle of illuminating plane light wave, and the optical torque can be controlled by adjusting the incident angle of circularly polarized plane light and the filling factor of the nanoparticle. Additionally, a new method to enhance vacuum friction torque is proposed through designing the filling factor of the rotating nanoparticle.
Article
Optics
V. B. Novikov, T. V. Murzina
Summary: Optical vortices with donut shapes, known as spatiotemporal optical vortices (STOV) pulses, have attracted much attention in photonics due to their promising applications. In this study, STOV pulses were generated by transmitting femtosecond pulses through a thin epsilon-near-zero (ENZ) metamaterial slab containing a silver nanorod array. The interference of main and additional optical waves in these ENZ metamaterials, enabled by their strong optical nonlocality, led to the appearance of phase singularities in the transmission spectra. A cascaded metamaterial structure was proposed for high-order STOV generation.
Article
Optics
Hong-Zhuo Gao, Wen-Rui Xu, Ming-Cheng Li, Nasir Ilyas, Ji-Min Wang, Wei Li, Xiang-Dong Jiang
Summary: Plasmonic sensors based on hyperbolic metamaterials offer great potential for high sensitivity, low-cost, label-free detection of single molecules. In this study, we designed a thin film structure based on traditional silver plasma material and prepared a TiN(x)O(y) material, which acted as the dielectric component. Finite-difference time-domain simulations were used to determine the optimal number of layers, and a device was fabricated using magnetron sputtering. The results showed excellent response to refractive index changes in the near-infrared band, making it suitable for plasmonic refractive index sensing.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Physical
Jie Xu, Zhao Tang, You Ran Wu, Hai Feng Zhang
Summary: This paper introduces a layered photonic structure (LPS) sensor that utilizes the intrinsic absorption principle of graphene to generate an absorption peak within the terahertz (THz) frequency range. The sensor can detect multiple substances and physical quantities due to its Janus metastructure properties in forward and backward directions. The addition of hyperbolic metamaterials (HMs) enables the sensor to exhibit angle-insensitive characteristics. Particle swarm optimization (PSO) algorithm is used to optimize the sensor's performance, resulting in excellent sensing performance for voltage, glucose, and alcohol solutions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Bartosz Janaszek, Pawel Szczepanski
Summary: This work investigates light generation in a DFB laser with a hyperbolic medium and active material, forming a 1D photonic hypercrystal. By tuning effective dispersion, laser action can be controlled for single-frequency generation with high side-mode suppression and controllable wavelength of operation. Additionally, a new mechanism for laser amplitude modulation via voltage-controllable dispersion of hyperbolic medium is presented.
Article
Chemistry, Physical
Bartosz Janaszek, Anna Tyszka-Zawadzka, Pawel Szczepanski
Summary: This study investigates the impact of spatial dispersion on propagation properties of planar waveguides with hyperbolic metamaterial (HMM) core layer. By altering the dimensions of the unit cells, new effects such as mode degeneration, power flow inversion, propagation gap, and plasmonic-like modes were observed. Additionally, unique characteristic points for high-beta TM mode were reported for the first time, showing power flow approaching zero and mode stopping at a specific waveguide width.
Article
Optics
Jia Guan, Mohammad Al-Amri, Jingping Xu, Nandi Bao, Chengjie Zhu, Ge Song, Yaping Yang
Summary: A switch based on switchable magnetic hyperbolic metamaterial is designed, with the ability to switch isofrequency curves between elliptical and hyperbolic shapes via an external DC magnetic field. Different isofrequency curves allow for positive refraction, total reflection, and negative refraction of TE polarized Gaussian beams. Simulation of electric field distribution confirms the predictions, making the switch efficient in controlling refraction properties.
OPTICS COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Qi-Ming Chen, Michael Fischer, Yuki Nojiri, Michael Renger, Edwar Xie, Matti Partanen, Stefan Pogorzalek, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Summary: By measuring the non-equilibrium dynamics of a superconducting Duffing oscillator, we experimentally reconcile the classical and quantum descriptions and explain the classically regarded steady states as quantum metastable states. Our results reveal a smooth quantum state evolution behind a sudden dissipative phase transition and provide insights into the intriguing phenomena in driven-dissipative systems.
NATURE COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Hyungjun Heo, Sangjun Lee, Sangin Kim
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2019)
Article
Chemistry, Physical
Hyungjun Heo, Sangjun Lee, Sangin Kim
Article
Optics
In Joon Lee, Sangin Kim
Article
Optics
Myunghwan Kim, Sangin Kim, Soeun Kim
Summary: A new type of mid-infrared ultra-compact optical modulator composed of a graphene metasurface is proposed in this study. Unlike previous schemes, this modulator utilizes the topological characteristic of the isofrequency contour in the hyperbolic metasurface to modulate transmission, providing a modulation depth of 10.7 dB with a length of 750 nm, which is approximately 1/30 of an operating wavelength.
Article
Optics
Sangjun Lee, Joohyung Song, Sangin Kim
Summary: The study introduces a novel perfect absorber design using guided-mode resonances for high absorption and enhanced fabrication error tolerance. The proposed scheme mimics a one-port system to achieve high absorption rates.
Article
Engineering, Electrical & Electronic
Joohyung Song, Hyungjun Heo, Sangjun Lee, Sangin Kim
Summary: We propose a novel approach to achieve unidirectional radiation in an asymmetric single resonator without using an external mirror. Through the mutual coupling between two degenerate resonant modes, the resonator can mimic a one-port system. The design of such devices is straightforward with the use of temporal coupled-mode theory and practical design method derived from it. Numerical simulations demonstrate the effectiveness of the proposed approach, showing a high ratio between upward and downward radiations.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Min Ki Woo, Chang Hoon Park, Byung Kwon Park, Hojoong Jung, Dongyeon Kang, Seung-Woo Jeon, Sangin Kim, Sang-Wook Han
Summary: This study proposes a new method that eliminates the bulky storage line in the plug-and-play quantum key distribution system by realizing an optical pulse train generator based on an optical cavity structure. It improves the secure key rate.
Article
Chemistry, Multidisciplinary
Min-Ki Woo, Chang-Hoon Park, Sangin Kim, Sang-Wook Han
Summary: In this study, a method for generating decoy pulses through amplification using an optical amplifier is proposed. It solves the technical issues in the plug-and-play architecture and is not limited by the input signal polarization. By adding a circulator to adjust the signal intensity, the system can operate stably and defend against Trojan horse attacks.
APPLIED SCIENCES-BASEL
(2022)
Article
Computer Science, Information Systems
Chang-Hoon Park, Min-Ki Woo, Byung-Kwon Park, Seung-Woo Jeon, Hojoong Jung, Sangin Kim, Sang-Wook Han
Summary: In this study, a bias control method for Mach-Zehnder modulator (MZM) using diagnostic pulses is proposed for efficient application in a quantum key distribution (QKD) system without additional hardware. The method maintains the MZM extinction ratio stably, even in an actual network environment, and achieves successful QKD performances.
Article
Optics
Hyeong-Soon Jang, Donghwa Lee, Hyungjun Heo, Yong-Su Kim, Hyang-Tag Lim, Seung -Woo Jeon, Sung Moon, Sangin Kim, Sang-Wook Han, Hojoong Jung
Summary: We have fabricated integrated photonic circuits for quantum devices using sputtered polycrystalline aluminum nitride (AlN) on insulator. The on-chip AlN waveguide directional couplers, which are crucial components in quantum photonics, exhibit output power splitting ratios ranging from 50:50 to 99:1. Additionally, polarization beam splitters with an extinction ratio over 10 dB have been achieved using the AlN directional couplers. By employing the fabricated AlN waveguide beam splitters, we have observed Hong-Ou-Mandel interference with a visibility of 91.7%±5.66%.
PHOTONICS RESEARCH
(2023)
Article
Computer Science, Information Systems
Min Ki Woo, Byung Kwon Park, Yong-Su Kim, Young-Wook Cho, Hojoong Jung, Hyang-Tag Lim, Sangin Kim, Sung Moon, Sang-Wook Han
Article
Optics
In Joon Lee, Sangin Kim
