Article
Engineering, Electrical & Electronic
Yi-Zhen Wan, Xueyi Zhu, Feng Wu, Lele Zhou, Ning Ma, Lu Wang, Weiping Qian
Summary: The major challenge in the application of photonic crystal biosensors is to improve the sensitivity, selectivity, and reliability of detecting target analytes in complex real samples. This study introduces the concept of utilizing the optical thickness of bottom-up assembled photonic crystals as a parameter for biosensing, and finds that it shows higher sensitivity and reliability compared to the traditional photonic band gap parameter in real samples.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Physics, Applied
Haiyun Tan, Mingjie Zhou, Lanjian Zhuge, Xuemei Wu
Summary: Introducing plasma into the sandwich structure can conveniently turn the photonic band gap on or off, paving the way for tunable microwave applications.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Shweta Mehta, Suchitra Vankalkunti, Pawan Kumar Kachhap, Prakash Ratan Gautam, Mandeep Singh
Summary: This study proposes a photonic crystal refractive-index sensor for the detection of volatile organic compounds (VOC). Two sensor designs using Y-splitter photonic crystal waveguide are analyzed using the finite-difference time-domain (FDTD) method. Simultaneous monitoring of two different analytes is possible across the arms of the Y-splitter. The use of porous silicon (p-Si) rods with a porosity of 25% creates a variable refractive index sensing region, resulting in a relative shift in the resonant wavelength of the traveling mode. The numerical simulations confirm a sensitivity of -195.83 nm/RIU and a figure-of-merit of -24.482 RIU-1 in the presence of hazardous alcohols.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Optics
Jorg Imbrock, Dominik Szalek, Simon Laubrock, Haissam Hanafi, Cornelia Denz
Summary: By controlling the temperature and spacing of the seeds with femtosecond laser pulses, specific two-dimensional nonlinear photonic structures can be efficiently formed in lithium niobate crystals.
Article
Engineering, Electrical & Electronic
R. Arunkumar, S. Robinson
Summary: This paper proposes a novel structure for a 2*4 optical decoder using a two-dimensional photonic crystal. The decoder is based on silicon rod photonic crystals and has four output ports, two input ports, and a biasing port. The analysis of the decoder is performed using the Finite Difference Time Domain and Plane Wave Expansion methods, which demonstrate that the optimized functional parameters make the proposed decoder suitable for future all-optical information processing.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Multidisciplinary Sciences
Xiaopeng Zhang, Yangjun Luo, Yi Yan, Pai Liu, Zhan Kang
Summary: A new photonic crystal topological design strategy is proposed to achieve any specified band gap structure around the target frequency. The optimization model introduces a band gap index to measure the distances between specified and adjacent frequencies, utilizing a low number of design variables in the PhC unit cell. The sequential Kriging-based algorithm is applied for solving the optimization problems, resulting in PhC unit cell designs that match any specified central frequency value and achieve a large relative band gap.
ADVANCED THEORY AND SIMULATIONS
(2021)
Article
Chemistry, Physical
P. B. de Sousa, A. F. Gouveia, J. C. Sczancoski, I. C. Nogueira, E. Longo, M. A. San-Miguel, L. S. Cavalcante
Summary: The study reports the electronic structure, optical, and sonophotocatalytic properties of calcium tungstate (CaWO4) microcrystals synthesized by the sonochemical method. The theoretical calculations confirmed the decrease in optical band gap energy for defect-based structures, and the electron density maps indicated the presence of structural defects inducing a polarization phenomenon and inhomogeneous distribution of electron charge.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Yan Zhi, Weici Liu, Xiangbo Yang, Zhongchao Wei, Shiping Du, Hongyun Meng, Hongzhan Liu, Jianping Guo, Liujing Xiang, Zhenming Huang, Haoxian Li, Faqiang Wang
Summary: In this study, a one-dimensional periodic ring multi-connected optical waveguide network is designed to solve the problem of obtaining ultra-wide photonic band gaps. The analysis of the network's spatial structures and numerical relations reveals a common characteristic that the photonic band gap width is independent of the number of nodes in a unit cell of the optical waveguide network. By comparing it with existing optical waveguide network schemes, the potential practicability of the network is explored, showing advantages of lower complexity for the spatial topology, better scalability, and better structural invariance.
RESULTS IN PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Yong Wang, Biaogang Xu, Dengguo Zhang, Wenlong He, Hou Ian
Summary: This study presents a photonic crystal-based isolator design featuring a unique reflecting cavity and built-in fan-shaped coupler, where four Ni-Zn ferrite posts achieve rotations. Despite its compact size of about 46.6 x 41.6 x 4.32 mm(3), the design achieves excellent forward transmission efficiency and reverse isolation of 0.50 dB and 44.20 dB, respectively.
APPLIED SCIENCES-BASEL
(2021)
Article
Optics
Bipin K. Singh, Vaishali Bambole, Subhashish Tiwari, Kaushal K. Shukla, Praveen C. Pandey, Vipul Rastogi
Summary: The study focuses on the photonic bandgap characteristics of one-dimensional exponential graded photonic crystals in the microwave region, revealing that the number of photonic bands increases with the thickness of graded layers. The bandwidth of photonic band gaps can be tuned by modulating the refractive index of the graded layer.
Article
Materials Science, Multidisciplinary
Yulia M. Cherepanova, Nina A. Sapoletova, Sergey E. Kushnir, Ilya Roslyakov, Kirill S. Napolskii
Summary: This study proposes a method for accurately determining the dependence of the effective refractive index of anodic titanium oxide photonic crystals on etching charge density, and uses this method to synthesize photonic crystals with desired photonic band gap positions.
Article
Mathematics, Applied
Jinyue Chen, Yixin Li, Xianliang Hu
Summary: A two-grid method is proposed to solve phase field models for the band gap optimization in photonic crystal design based on the TE mode. The method uses finite element methods on nested grids to solve different PDEs and achieves a balance between phase evolving and state equation solver through discretization on coarse and fine grids, along with additional correction steps. The efficiency and robustness of the method are demonstrated through numerical examples, showing improved computation speed without sacrificing accuracy.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Mahendra Kumar, Surendra Prasad
Summary: This paper presents a theoretical investigation of interface modes at the interface of two isotropic dielectric photonic crystals. The dispersive properties for both sigma - polarized waves and pi - polarized waves are discussed, including dispersion curve, photonic band gap (PBG) shrinking - optical holes, and Brewster points. It is shown that interface modes are of prime importance for sigma - polarized waves, while only DD and DE type interface modes exist for pi - polarized waves. Additionally, only EE type interface modes exist for pi - polarized waves, which are completely transmitted through the photonic structure. Therefore, depending on the properties of the chosen materials, this photonic structure can have various applications in sensor design, optical filters, optical switches, etc., and is suitable for exploring the electromagnetic behavior at the interface of different media.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Optics
Bartosz Janaszek, Anna Tyszka-Zawadzka, Pawel Szczepanski
Summary: In this work, we explore the possibilities of manipulating photonic density of states (PDOS) in photonic hypercrystals (PHCs). Our analysis demonstrates the ability to achieve photonic bandgap for specific polarization of light and significant enhancement in broadband PDOS. We also introduce the concept of anomalous dispersion arising from effective resonance of the hyperbolic medium in the PHC structure, which can result in negative PDOS, similar to the mobility gap observed in electronic crystals. Furthermore, we show that employing PHC structures instead of standalone hyperbolic media enables more versatile electromagnetic responses, such as broadband perfect absorption with adjustable spectral range of operation.
Article
Optics
SeungGu Kang, Joonghan Shin
Summary: This study investigated the impact of different laser beam intensity distributions on aluminum alloy butt welding, finding that welding with modulated beams can reduce weld defects and achieve higher tensile strength.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Chemistry, Physical
Shusuke Okada, Kenta Takagi, Kimihiro Ozaki
JOURNAL OF ALLOYS AND COMPOUNDS
(2016)
Article
Materials Science, Multidisciplinary
Shusuke Okada, Kenta Takagi, Kimihiro Ozaki
MATERIALS CHEMISTRY AND PHYSICS
(2016)
Article
Chemistry, Physical
Shusuke Okada, Kazuyuki Suzuki, Eri Node, Kenta Takagi, Kimihiro Ozaki, Yasushi Enokido
JOURNAL OF ALLOYS AND COMPOUNDS
(2017)
Article
Materials Science, Multidisciplinary
Akihide Hosokawa, Kenta Takagi, Takahiro Kuriiwa
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2017)
Article
Nanoscience & Nanotechnology
Shusuke Okada, Kazuyuki Suzuki, Eri Node, Kenta Takagi, Kimihiro Ozaki, Yasushi Enokido
Article
Chemistry, Physical
Kohei Otogawa, Kenta Takagi, Toru Asahi
JOURNAL OF ALLOYS AND COMPOUNDS
(2018)
Article
Materials Science, Multidisciplinary
Kenta Takagi, Miho Jinno, Kimihiro Ozaki
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2018)
Article
Physics, Multidisciplinary
Kohei Otogawa, Toru Asahi, Miho Jinno, Wataru Yamaguchi, Kenta Takagi, Hansang Kwon
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
(2018)
Article
Engineering, Chemical
Rikio Soda, Kohei Tanaka, Kenta Takagi, Kimihiro Ozaki
Article
Nanoscience & Nanotechnology
Akihide Hosokawa, Kenta Takagi
Article
Chemistry, Physical
Y. Hirayama, K. Suzuki, W. Yamaguchi, K. Takagi
JOURNAL OF ALLOYS AND COMPOUNDS
(2018)
Article
Nanoscience & Nanotechnology
Akihide Hosokawa, Kenta Takagi
Article
Materials Science, Multidisciplinary
Akihide Hosokawa, Kenta Takagi, Takahiro Kuriiwa, Yuki Inoue, Kimihiro Ozaki
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2019)
Proceedings Paper
Physics, Applied
N. Imaoka, K. Takagi, K. Ozaki, T. Iriyama, H. Kato
8TH JOINT EUROPEAN MAGNETIC SYMPOSIA (JEMS2016)
(2017)
Article
Materials Science, Multidisciplinary
Akihide Hosokawa, Kenta Takagi
