Article
Optics
Yanqing Zhang, Haili Ma, Yicun Yao, Minghong Wang, Liqiang Zhang, Zhaogang Nie, Chenglin Bai
Summary: Multi-core fibers are widely used for vector-bending sensing. Compared to Bragg grating-based sensors, fiber Fabry-Perot (F-P) interferometers have advantages in fabrication and potential for improved sensitivity. We propose and demonstrate a cascaded F-P cavity vector bending sensor, which shows strong bending dependence and can reconstruct the curvature magnitude and direction from the tilted wavelength shift of the asymmetric fiber-core F-P cavities.
Article
Engineering, Electrical & Electronic
Oscar J. Ballesteros-Llanos, Efrain Mejia-Beltran, Maribel Juarez-Hernandez
Summary: The performance of a Raman fiber laser was modified step-by-step, changing from a simple free-running distributed-feedback cavity to a ring configuration, adding a Fabry-Perot filter, and inserting a piece of Yb3+-doped fiber. Each modification resulted in changes to the emitted spectrum, increased efficiency, and improved power stability. The enhancements led to emission of a single-line with improved stability and decreased oscillating threshold. These modifications offer alternatives for achieving more stable, efficient, and pure emission in Raman fiber lasers.
OPTICAL FIBER TECHNOLOGY
(2021)
Article
Physics, Multidisciplinary
Zhao Xin-Wei, Lu Jun-Peng, Ni Zhen-Hua
Summary: With the post-Moore era, the application of semiconductor micro-nano lasers is shifting towards photonic integration, with various semiconductor materials rapidly advancing the field. Perovskite materials, such as lead halide perovskites, show promising optical properties, making them excellent candidate materials for high-gain, low-threshold semiconductor micro-nano lasers. The Fabry-Perot resonator laser, a type of perovskite laser, has been extensively researched due to its simple structure and high application value.
ACTA PHYSICA SINICA
(2021)
Article
Chemistry, Multidisciplinary
Zhihuan Li, Jianxi Liu, Xiaobin Yi, Wei Wu, Fanfan Li, Zhenkang Zhu, Haiqi Li, Junqin Shi, Yadong Xu, Feng Zhou, Weimin Liu
Summary: This study presents a Fabry-Perot cavity constructed using metal-organic frameworks and TiO2 nanoparticles for selective sensing of chemicals. The cavity bandwidth can be tuned over a broad range by adjusting the size and concentration of TiO2, and the thickness and refractive index of HKUST-1 thin films.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Luohao Lei, Hongye Li, Jing Shi, Qihao Hu, Xiaofan Zhao, Baiyi Wu, Meng Wang, Zefeng Wang
Summary: This study presents the fabrication of miniature FBGs-based FPCs using femtosecond laser line-by-line scanning writing technique, enabling convenient control over grating length, position, and spacing to achieve desired transmission spectra. Experimental investigation on temperature and strain responses of the fabricated FBGs-based FPCs were conducted for future sensing applications.
Article
Chemistry, Multidisciplinary
Taehyun Kim, Jongsu Lee, Eui-Sang Yu, Seungha Lee, Hyeonbin Woo, Jeonghun Kwak, Seok Chung, Inhee Choi, Yong-Sang Ryu
Summary: This article introduces the structure and characteristics of the Fabry-Perot (FP) resonator, and demonstrates the tuning of surface-enhanced Raman scattering (SERS) enhancement factor (EF) using a metal-dielectric-metal structure. Computational and experimental analyses investigate the near-field EF of randomly dispersed gold nano-gaps and the far-field SERS EF modulation by varying the optical resonance of the FP etalon. The study highlights the importance of wavelength matching between FP resonance and excitation/scattering wavelengths in determining the magnitude of the SERS EF. Finally, a tunable SERS platform with a controlled dielectric cavity is proposed, and its dynamic SERS switching performance is validated through information encryption via liquid immersion.
Article
Optics
Jun Liu, Tao Liu, Long Chen, Linbo Zhang, Guanjun Xu, Dongdong Jiao, Shougang Zhang
Summary: This study introduces a prototype narrow linewidth laser based on a high finesse optical reference cavity, which can operate reliably in space. The research has preliminarily achieved a fractional frequency instability of 1.6 x 10(-15) @ 1s and a linewidth of 0.86 Hz for a single system.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Zhaoxu Zhang, Huaping Gong, Changgui Yu, Kai Ni, Chunliu Zhao
Summary: In this study, an optical fiber relative humidity sensor based on femtosecond laser micromachining Fabry-Perot cavity with composite film is proposed. The effect of the hole perforated on the Fabry-Perot cavity by femtosecond laser on the humidity performance of the sensors is studied for the first time. The best performance is achieved by a sensor with a hole diameter of 40μm, mixture ratio of 1:2 HA/PVA, and a film thickness of 20μm. The sensor exhibits a linear response to humidity with high sensitivity and stability.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Yeong-Geun Jeon, Gwang-Ro Yun, Jongyeong Kim, Dongho Kim
Summary: In this paper, we propose an innovative polarization reconfigurable high-gain Fabry-Perot cavity (FPC) antenna. By using a novel polarization conversion partially reflective surface (PCPRS) as a superstrate, the antenna can electrically select its polarization among three linear polarization (LP) modes and maintain stable high gain.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Larissa Maria Beserra Soares, Juan David Lopez Vargas, Regina Celia da Silva B. Allil, Alex Dante, Marcelo Martins Werneck
Summary: This article presents a compact fiber-optic current sensor based on an in-fiber Fabry-Perot interferometer and a magnetostrictive transducer. The sensor exhibits high sensitivity to electric current sensing and has the potential to replace traditional current transformers.
IEEE SENSORS JOURNAL
(2022)
Article
Optics
Shinya Kato, Takao Aoki
Summary: We demonstrate the realization of single-frequency stimulated Brillouin lasing in short fiber Fabry-Perot resonators. By adjusting the parameters of fiber Bragg gratings, we avoid cascaded lasing and achieve efficient, compact, narrow-linewidth light sources.
Article
Materials Science, Multidisciplinary
Zhi-Yu Yu, Zhi-He Guo, Yu-Chen Zhang, Xun Zhang, Yan Wang, Feng-Yang Ma, Yu Liu, Xia-Yan Xue, Qing-Yuan Jin, Jing Li, Jian Sun, Song-You Wang, Dong-Chen Wang, Ming Lu
Summary: A luminescent Si nanocrystal thin film with high photoluminescence quantum yield was successfully fabricated, achieving a net optical gain structure and threshold behavior under optical pumping. Various laser characteristics were observed, such as spectral narrowing, polarization, and small emission angles.
RESULTS IN PHYSICS
(2022)
Article
Materials Science, Ceramics
Luyi Zheng, Shiyu Zhang, Qi Yao, Kai Lin, Aiguo Rao, Chunhui Niu, Mingqing Yang, Lei Wang, Yong Lv
Summary: This study utilized a broadband absorption Fabry-Perot cavity structure to actively modulate the optical response and successfully obtained different spectral colors such as red, orange, yellow, green, blue, and violet. The electrochromic device has the advantages of high brightness, high saturation, low cost, and low power consumption, providing a new option for designing full-color reflective displays in the future.
CERAMICS INTERNATIONAL
(2023)
Article
Optics
Zeqiu Liu, Sikang Yang, Yu Han, Tengfei Hao, Minming Zhang, Ming Li, Ninghua Zhu
Summary: By breaking the parity-time (PT) symmetry, single mode operation lasing can be achieved in a multiple mode Fabry-Perot (FP) resonator, which is of vital importance for practical applications like communication systems. Two identical FP resonators are used to establish a symmetric system, resulting in high output power with lower fabrication difficulty and intracavity losses compared to ring resonators. The PT-symmetric FP laser has also been demonstrated with electrical pumping, offering potential for mode selection of high-performance FP lasers in practical applications.
Article
Chemistry, Analytical
Joao M. B. Pereira, Paula M. P. Gouvea, Arthur M. B. Braga, Isabel C. S. Carvalho, Antonio C. Bruno
Summary: The optical-mechanical behavior of a Fabry-Perot Interferometer (FPI) composed of a capillary segment and two sections of standard optical fiber was investigated using the finite element method (FEM). The developed FEM model was validated and used to show that the absolute strain on the host substrate is usually smaller than the strain measurement obtained with the sensor. A cavity geometry that can generate the correct absolute strain without requiring previous strain calibration was proposed.
Article
Materials Science, Multidisciplinary
Hisao Yanagi, Fumio Sasaki, Kenichi Yamashita
ADVANCED OPTICAL MATERIALS
(2019)
Article
Physics, Applied
Shohei Dokiya, Hideyuki Mizuno, Hitoshi Mizuno, Hiroyuki Katsuki, Kenichi Yamashita, Fumio Sasaki, Hisao Yanagi
APPLIED PHYSICS EXPRESS
(2019)
Article
Optics
Marie Taguchi, Youtaro Higase, Kenichi Yamashita
Article
Physics, Applied
Yuya Hara, Youtaro Higase, Marie Taguchi, Shun Takahashi, Fumio Sasaki, Kenichi Yamashita
APPLIED PHYSICS LETTERS
(2020)
Article
Nanoscience & Nanotechnology
Kentaro Fujiwara, Shuai Zhang, Shun Takahashi, Limeng Ni, Akshay Rao, Kenichi Yamashita
Article
Chemistry, Physical
Jie Kong, Wei Zhang, Yuanyuan Guo, Xinmiao Niu, Takeshi Yamao, Kenichi Yamashita, Andong Xia
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)
Article
Optics
Shun Takahashi, Souma Tamaki, Kenichi Yamashita, Takuya Yamaguchi, Tetsuya Ueda, Satoshi Iwamoto
Summary: Microwave transmission measurements were conducted on a three-dimensional layer-by-layer chiral photonic crystal with 3D singular points, Weyl points. It was found that the transmitted intensity near a Weyl point is inversely proportional to the square of the propagation length. The transmitted wave was well-collimated in the plane parallel to the PhC layers, even for point-source incidence, and a cloaking effect was observed when a plane wave was incident on the PhC containing metal scatters.
Article
Optics
Tomoya Tagami, Yusuke Ueda, Keita Imai, Shun Takahashi, Hitoshi Mizuno, Hisao Yanagi, Takeshi Obuchi, Masaaki Nakayama, Kenichi Yamashita
Summary: Organic semiconductors show promise as platforms for room temperature polaritonic devices, but practical implementation requires lowering the condensation threshold. Anisotropic light-matter coupling characteristics in an organic crystal microcavity with strong molecular orientation were investigated, along with below-threshold excitation dynamics. It was found that photonic/excitonic hybrid transition processes coexist in the system, providing valuable insights into understanding polariton dynamics and designing devices with a low-threshold condensed phase.
Article
Optics
Shuki Enomoto, Tomoya Tagami, Yusuke Ueda, Yuta Moriyama, Kentaro Fujiwara, Shun Takahashi, Kenichi Yamashita
Summary: Lead-halide perovskites are highly promising for optoelectronic applications, especially in laser devices. In this study, the photoluminescence properties of inorganic perovskite microcavities at room temperature are systematically investigated. The angle-resolved photoluminescence demonstrates a transition from weak coupling regime to strong coupling regime in the microcavity system, accompanied by an increase in correlated electron-hole pairs. Above a certain pumping fluence, the photoluminescence signal shows lasing behavior with bosonic condensation characteristics and long-range phase coherence. However, the excitation density required for lasing behavior exceeds the Mott density, suggesting that the excited state is not an exciton but a polaritonic Bardeen-Cooper-Schrieffer state.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Physics, Applied
Ayane Murota, Kengo Oka, Ryotaro Hayashi, Kentaro Fujiwara, Takushi Nishida, Kei Kobayashi, Youhei Numata, Kenichi Yamashita
Summary: Optimization of SnO2 electron transport layer in perovskite semiconductor devices is crucial, but a systematic study on its preparation and characterization is lacking. This study investigates the morphological and electronic-functional roles of SnO2 electron transport layer prepared by spin-coating on FTO substrates. The study finds that spin-coated SnO2 electron transport layer can cover FTO surface as an ultrathin wrapping layer, and excessive SnO2 deposition leads to poor electron extraction and device performance degradation.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Tsukasa Nagafusa, Yuya Hara, Koji Nishio, Toshiyuki Isshiki, Kenichi Yamashita
Summary: This paper investigates the broadband emission characteristics of graphene quantum dots (GQDs) and their potential application in optical amplification. The GQD particles are prepared by a microwave-assisted hydrothermal method and mixed with a polymer matrix to form a thin film. The study finds that GQDs exhibit a wide-range tunability in their emission wavelength and can achieve broadband amplified spontaneous emission (ASE) signal. Furthermore, the optical amplification performance of GQDs is closely associated with their photoluminescence quantum yield.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Takumi Matsuo, Yusuke Ueda, Hitoshi Mizuno, Fumio Sasaki, Kenichi Yamashita, Hisao Yanagi
Summary: Polaritonic photonics is a key technology for future quantum-based information and communication. In this study, we provide strong evidence of vibrationally dressed exciton polaritons formed in a single-crystal planar cavity of 5,5 ''-bis(biphenylyl)-2,2':5',2 ''-terthiophene (BP3T) at room temperature. Under optical pumping, the BP3T crystals exhibit longitudinal multimode lasing based on Fabry-Perot (F-P) resonation. Each gain-narrowed vibronic band splits into multiple peaks at the lasing threshold, accompanied by a time delay. These characteristics cannot be explained by conventional photon lasing, but can be well-explained by coupling with cooperative vibrations of the ordered BP3T molecules.
Article
Chemistry, Multidisciplinary
Ryotaro Hayashi, Ayane Murota, Kengo Oka, Yuhi Inada, Kenichi Yamashita
Summary: For practical application of perovskite photovoltaic devices, it is important to choose a carrier extraction material with high mobility, conductivity, and appropriate energy levels. The commonly used hole transport material, spiro-OMeTAD, can be oxidized to improve its electrical properties. However, the current oxidation process takes a long time. To address this, a rapid and reproducible oxidation route using UV ozone treatment is proposed, reducing the oxidation time to as short as 30 seconds. This method not only modifies the energy level of spiro-OMeTAD, reducing voltage loss, but also improves conductivity and mobility, enhancing the photovoltaic properties. This finding contributes to the development of spiro-OMeTAD-based perovskite solar cell devices.
Article
Materials Science, Multidisciplinary
Hitoshi Mizuno, Tomomi Jinjyo, Kazuki Bando, Fumio Sasaki, Kenichi Yamashita, Hisao Yanagi
Summary: Microcrystals with different orientations of thiophene/phenylene co-oligomers (TPCOs) were prepared as Fabry-Perot microresonators using a miniemulsion technique. Strong exciton-photon coupling was demonstrated for BP2T and BP2T-CN microcrystals owing to their active microresonators providing effective photonic mode confinement. The strength of the coupling between excitons and photons is correlated with the refractive index and absorption coefficient originating from the transition dipole moment and oscillator strength, with BP2T-CN achieving a larger value of omega due to its higher absorption coefficient, larger refractive index, and smaller mode volume.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Physics, Applied
Shota Kanbe, Junta Kagae, Ayane Murota, Yuya Hara, Kentaro Fujiwara, Kenichi Yamashita
APPLIED PHYSICS LETTERS
(2020)
