Article
Chemistry, Multidisciplinary
Chia-Chien Huang, Ruei-Jan Chang, Ching-Wen Cheng
Summary: This study proposed a waveguide structure consisting of multilayer graphene metamaterials, which support ultralow loss and long propagation lengths, suitable for building high-density photonic integrated circuits.
Article
Engineering, Electrical & Electronic
Tao Ma, Shaohui Liu, Yongsheng Tian, Heng Liu, Fang Wang
Summary: A graphene-hBN-silicon hybrid plasmonic rib waveguide is designed for refractive index sensing, achieving a high FOM value by optimizing size parameters and showing remarkable propagation performance peaks. The sensing structure demonstrates good sensitivity for homogeneous and surface sensing, making it suitable for ultra-compact on-chip micro-nano photonic biochemical sensing systems.
IEEE SENSORS JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Yuanlin Jia, Huaiyuan Yin, Huawei Yao, Junqiao Wang, Chunzhen Fan
Summary: A graphene-based metal-insulator-metal metamaterial was studied to achieve an active and adjustable multi-band perfect absorber. By breaking the symmetry of T-shaped cavities, a transition from dual-band to tri-band absorption was observed.
RESULTS IN PHYSICS
(2021)
Article
Chemistry, Physical
M. A. Butt, N. L. Kazanskiy, S. N. Khonina
Summary: This paper presents a numerical analysis of a compact 1 x 2 plasmonic demultiplexer based on a metal-insulator-metal (MIM) waveguide. Two hollow circular cavities are side coupled to the bus waveguide on both sides, designed to resonate at the working wavelengths of 1310 nm and 1550 nm. The mechanism of light coupling to an MIM waveguide was not considered in previous studies, thus a silicon tapered mode converter is integrated to efficiently convert a dielectric to a plasmonic mode in the plasmonic demultiplexer. The footprint of the device is 6 μm x 6 μm. The crosstalk at P1 and P2 is about 14.07 dB and 13.67 dB for the transmission wavelength of 1310 nm and 1550 nm, respectively.
Article
Materials Science, Multidisciplinary
Zhiyu Wang, Cheng-Chieh Lin, Ya-Lun Ho, Rong Xiang, Shigeo Maruyama, Chun-Wei Chen, Jean-Jacques Delaunay
Summary: The study demonstrated a CsPbBr3 nanocrystal-based photodetector operating in the telecommunications bands via surface plasmon-induced hot holes, showing potential applications in biodetection, infrared imaging, and telecommunications. By performing solvent treatment on the thin film, a compact and uniform morphology was achieved, benefiting carrier transportation, reducing optical scattering, and allowing integration of the photodetector into the plasmonic structure.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Samyuktha K. Reddy, Mandeep Singh
Summary: This study demonstrates the use of a MISIM waveguide structure for ethanol sensing, showing that in the presence of harmful ethanol, the electric field in a low refractive index slot undergoes a red-shift in wavelength. By adjusting the silicon porosity and physical dimensions, the red-shift can be controlled. The optimized sensor metrics obtained through simulations and the fabrication stages are described. The sensor is found to be feasible for ethanol detection in hazardous environments.
IEEE SENSORS JOURNAL
(2022)
Article
Physics, Applied
Weicheng Chen, Jingwen Wu, Dian Wan, Jie Wang, Jiaqi Wang, Yi Zou, Zhenzhou Cheng, Tiegen Liu
Summary: The study demonstrated high coupling efficiency and bandwidth of subwavelength grating couplers in the spectral range of 2.2-2.5 μm. Reproducibility of fabricated grating couplers and design and fiber coupling tolerance were also investigated in the study.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Chuhua Wu, Zicong Guo, Shuxian Chen, Jun Yang, Kunhua Wen
Summary: In this study, a coupled plasmonic resonant system using a metal-insulator-metal (MIM) waveguide is proposed to generate multiple Fano resonances. By employing the multi-mode interference coupled-mode theory (MICMT), the system is analyzed theoretically and numerically validated with the finite-difference time-domain (FDTD) method. The designed structures show great potential for high integrated optical circuits of chip-scale optical sensors, slow light devices, or splitters, with the ability to manipulate Fano peaks through adjusting the parameters of the defective ring cavity.
RESULTS IN PHYSICS
(2021)
Article
Optics
Fatemeh Abdolalipour, Maryam Pourmahyabadi
Summary: This article presents a plasmonic filter scheme consisting of a nanodisk cavity and two T-shaped MIM waveguides, which achieves perfect transmission peak by optimizing structure parameters. The proposed structure exhibits high transmission rate and quality factors in the optical communication wavelength range, and a design of a two-channel demultiplexer is also introduced.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2022)
Article
Chemistry, Physical
Zahra Madadi
Summary: A plasmonic perfect absorber based on a metal-insulator-graphene-metal structure is proposed as a tunable sensor in this paper. The device shows a resonance peak in the absorption spectrum, which can be blue-shifted by adjusting the chemical potential of graphene and red-shifted by increasing the refractive index of analytes on its surface. The sensitivity of the device is found to be 10,400 nm/RIU, indicating its excellent ability to detect analytes with low refractive index differences.
Article
Materials Science, Multidisciplinary
Yunping Qi, Chuqin Liu, Bingbing Hu, Xiangyu Deng, Xiangxian Wang
Summary: A tunable selective absorber consisting of periodic arrow-shaped graphene arrays operating in the far infrared and terahertz range is proposed by depositing a set of arrow-shaped graphene ribbons on a SiO2 dielectric spacer. The research shows that increasing both the Fermi level and relaxation time significantly enhances the absorption performance, with a nearly 12-fold improvement when both parameters are increased simultaneously. Additionally, increasing the relaxation time from 0.1 ps to 1.0 ps results in an increase in the maximum absorption peak value.
RESULTS IN PHYSICS
(2021)
Article
Optics
Tangming Li, Jun Zhu, Liuli Qin
Summary: We studied the nonlinear optical properties of a square split-ring structure of magnetic meta-materials and the mechanism by which a non-centrosymmetric silver structure generates the second harmonic within the near-infrared band. We also applied the silver structure in an air cavity-silver-glass structure for sensing and found that by changing the shape and split width of the silver structure, the sensitivity is significantly improved, measurement of amino acid solutions up to 1007.2 nm/RIU. This study brings new insight into the application of second harmonics with nonlinear effects in the sensing field.
Review
Chemistry, Physical
Mariam Saeed, Abdul Ghaffar, Sajjad Ur Rehman, Muhammad Yasin Naz, Shazia Shukrullah, Qaisar Abbas Naqvi
Summary: This paper presents a historical review of graphene-based waveguides, which can be categorized based on parameters such as geometry, number of graphene layers, and nature of partnering materials.
Article
Physics, Applied
Zhi Li, Zhen He, Liqiang Zhuo, Shaojian Su, Zhili Lin, Weibin Qiu, Beiju Huang, Qiang Kan
Summary: In this article, three categories of edge states in the honeycomb lattice are investigated theoretically using an effective tight-binding Hamiltonian. The corresponding dispersions of zigzag, bearded, and armchair edge states are analytically obtained. By solving Maxwell equations with boundary conditions, the actual edge-bulk correspondence and the light field distribution of graphene plasmonic crystals are obtained, which are in good agreement with the analytical results. The proposed plasmonic structures provide guidance for designing the frequency range dependent property of topological structures and show potential applications in topological robust devices.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Hiroaki Matsui, Miho Shoji, Satoko Higano, Hidehiko Yoda, Yosuke Ono, Jiaqi Yang, Teppei Misumi, Aki Fujita
Summary: In this study, the optical response of three-dimensional nanoparticle assemblies was investigated, and it was found that thin films made of Sn:In2O3 nanoparticles exhibit high performance in solar-thermal shielding applications. Lorentz resonances in plasmonic metamaterials and the electric field strength at interparticle gaps were studied through experiments and simulations. The packing density of nanoparticles was also found to play a key role in enhancing near-IR reflectance.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Shinpei Ogawa, Shoichiro Fukushima, Masaaki Shimatani
Summary: The study found that embedded hexagonal boron nitride in metallic nanoslits exhibits extraordinary optical transmission phenomena in the infrared spectrum, attributed to the hybridization of HPPs and SPRs. The calculated electric field distribution indicates that the phenomenon is due to the unique resonance induced by the hybridization of HPPs and SPRs.
Article
Materials Science, Multidisciplinary
Masaaki Shimatani, Takashi Ikuta, Yuri Sakamoto, Shoichiro Fukushima, Shinpei Ogawa, Kenzo Maehashi
Summary: In this study, turbostratic stacked chemical vapor deposition (CVD) graphene was employed to develop a mid-wavelength infrared (MWIR) photodetector, which showed enhanced performance compared to conventional single-layer graphene photodetectors. This research may contribute to the realization of low-cost, mass-producible graphene-based infrared sensors.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Materials Science, Multidisciplinary
Shoichiro Fukushima, Satoru Fukamachi, Masaaki Shimatani, Kenji Kawahara, Hiroki Ago, Shinpei Ogawa
Summary: This study presents graphene-based deep-ultraviolet photodetectors using chemical vapor deposition hexagonal boron nitride photogating. The incorporation of h-BN as a photosensitizer significantly improves the photoresponse and achieves a high responsivity under 260 nm light.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Optics
Shinpei Ogawa, Shoichiro Fukushima, Masaaki Shimatani
Summary: Graphene has potential applications in optoelectronic devices, but its photodetectors face challenges in carrier mobility and absorption. This study proposes a plasmonic metasurface based on hBN/graphene van derWaals heterostructure for wavelength-selective infrared photodetectors. The structure preserves graphene's high carrier mobility and enhances its absorption through localized surface plasmon resonance.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2022)
Review
Chemistry, Physical
Shinpei Ogawa, Shoichiro Fukushima, Masaaki Shimatani
Summary: Hexagonal boron nitride (hBN) is a key two-dimensional material that provides an ideal substrate for graphene. It has unique properties in the deep ultraviolet (DUV) and infrared (IR) wavelength bands, making it suitable for various photonic devices. This review discusses the physical properties and applications of hBN-based photonic devices in the DUV and IR wavelength regions, including light-emitting diodes, photodetectors, absorbers/emitters, hyperlenses, and enhanced absorption microscopy.
Article
Optics
Masaaki Shimatani, Shoichiro Fukushima, Manabu Iwakawa, Shinpei Ogawa
Summary: This study investigated the mechanism of graphene photogated diodes and demonstrated that a thin interfacial oxide layer is responsible for the reduction in Fermi level induced by photogating, resulting in an extraordinarily large output current in diodes with a barrier layer.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Shinpei Ogawa, Masaaki Shimatani, Shoichiro Fukushima
Summary: Graphene is a promising material for infrared photodetectors due to its high carrier mobility, broadband photoresponse, and low manufacturing cost. This study presents the development of high-performance graphene-based infrared photodetectors using field-effect transistors and graphene/semiconductor heterojunction structures. The results demonstrate high responsivity and low dark currents, which can contribute to the development of high-performance graphene-based infrared image sensors.
QUANTUM SENSING AND NANO ELECTRONICS AND PHOTONICS XVIII
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Shinpei Ogawa, Shoichiro Fukushima, Satoshi Okuda, Masaaki Shimatani
Summary: Graphene, an atomically thin carbon-based material with a two-dimensional hexagonal lattice structure, displays unique electronic and optical properties. Photodetectors utilizing graphene with a photosensitive layer such as graphene nanoribbons have shown enhanced performance in the mid- and long-wavelength infrared regions, contributing to the advancement of high-performance broadband infrared photodetectors.
INFRARED TECHNOLOGY AND APPLICATIONS XLVII
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Shinpei Ogawa, Shoichiro Fukushima, Masaaki Shimatani, Masafumi Kimata
Summary: In this study, a metal-insulator-metal (MIM) structure incorporating a nanoslit for infrared (IR) rectification is proposed. Wavelength selective detection can be achieved by controlling the slit width or depth. Fabrication procedures using gold electroplating and chemical mechanical polishing (CMP) have been developed for these structures.
INFRARED TECHNOLOGY AND APPLICATIONS XLVII
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Masaaki Shimatani, Takashi Ikuta, Yuri Sakamoto, Shoichiro Fukushima, Satoshi Okuda, Shinpei Ogawa, Kenzo Maehashi
Summary: This study explored the fabrication and performance of highly responsive photodetectors using turbostratic stacked graphene produced by chemical vapor deposition (CVD) and the photogating effect. The results showed that turbostratic stacked CVD graphene can improve the responsivity of photodetectors and contribute to the realization of low-cost, mass-produceable high-responsivity infrared sensors.
INFRARED TECHNOLOGY AND APPLICATIONS XLVII
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Shoichiro Fukushima, Masaaki Shimatani, Satoshi Okuda, Shinpei Ogawa
Summary: The study demonstrates the properties of small-format graphene infrared array sensors, showing high responsivity of graphene FETs under MWIR light irradiation and enhanced MWIR photoresponse through photogating. In comparison, the SBDs exhibited improved dark current characteristics.
INFRARED TECHNOLOGY AND APPLICATIONS XLVII
(2021)