Article
Optics
Jie Cheng, Dapeng Liu, Peng Dong, Gaojun Wang, Fengfeng Chi, Shengli Liu
Summary: By inserting an air gap between balanced gain and loss dielectric slabs, a parity time (PT) symmetric cavity with multiple PT symmetry and enhanced photonic spin Hall effect (SHE) is established. Near the resonance angle, the photonic SHE of transmitted and reflected light can reach its upper limitation, surpassing the effect of PT-symmetric structure without air gap. This novel sensing scheme based on photonic SHE enhancement offers a superior intensity sensitivity for refractive index sensing applications.
OPTICS COMMUNICATIONS
(2021)
Article
Optics
Mohamad Hazwan Haron, Dilla Duryha Berhanuddin, Burhanuddin Yeop Majlis, Ahmad Rifqi Md Zain
Summary: A double-peak one-dimensional photonic crystal cavity device has been designed for bio-sensing with self-compensation to reduce measurement errors caused by temperature changes. By combining two light resonances, two resonance peaks are obtained and the separation of peaks can be controlled by adjusting the cavity length difference between the two 1D PhCs in parallel.
Article
Materials Science, Multidisciplinary
Zhiyong Yin, Xili Jing, Huan Yang, Shuoyu Chen
Summary: A lossy mode resonance refractive index sensor based on two-dimensional polymer perovskite coating is proposed in this study. The sensor utilizes a photonic crystal fiber and allows for strong tunability by controlling the thickness of the film. Numerical results show high sensitivity response with adjustable detection range, making the proposed sensor distinct and suitable for water quality monitoring and biomolecular detection.
RESULTS IN PHYSICS
(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
Fujun Sun, Yan Yang, Zhihua Li, Daquan Yang, Huiping Tian, Chengkuo Lee
Summary: We present the characteristics of disturbed spatial modes in a multi-mode photonic crystal nanobeam cavity (PCNC) in the mid-infrared wavelength range through numerical and experimental methods. The resonance wavelength of the spatial modes can be controlled by modifying the size, period, and position of the central periodical mirrors in PCNC, leading to better utilization of the spectrum resource. Moreover, we investigate the side coupling characteristics of PCNC supporting both air and dielectric modes for the first time. This work serves as a proof of design method for flexible control of spatial modes in PCNC, enabling the realization of integrated multi-function devices in a limited spectrum range.
Article
Optics
Xinzhao Yue, Tao Wang, Ruoqin Yan, Lu Wang, Huimin Wang, Yuandong Wang, Jinyan Zhang, Jian Wang
Summary: In this study, a simple structure consisting of an asymmetric Fabry-Perot cavity covered by a gold grating was developed to achieve perfect absorption and extreme singularity of the reflective light's differential phase under normal incidence conditions. The proposed structure also functions as a refractive index sensing platform based on a singular phase. It provides a more efficient alternative to the conventional oblique-incidence phase measurement system in an integrated biosensor chip.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Simone Iadanza, Jesus Hernan Mendoza-Castro, Taynara Oliveira, Sharon M. Butler, Alessio Tedesco, Giuseppe Giannino, Bernhard Lendl, Marco Grande, Liam O'Faolain
Summary: This paper presents a novel design of high Q-factor silicon nitride (SiN) 1D photonic crystal (PhC) cavities side-coupled to curved waveguides, which can operate with both silica and air cladding. The etched 1D PhC cavity sidewalls angle is engineered to achieve high Q-factors over a wide range of upper cladding compositions, resulting in the highest calculated Q-factor for non-suspended asymmetric SiN PhC structures. The SiN PhC cavities are demonstrated to be used in hybrid external cavity laser configuration, enabling mode-hop free single mode laser operation with high power output and side-mode suppression ratios. Moreover, these devices are applied as compact and energy efficient optical sensors, exhibiting high sensitivity to refractive index changes in the surrounding medium.
Article
Chemistry, Analytical
Reyhaneh Jannesari, Thomas Grille, Gerald Stocker, Bernhard Jakoby
Summary: This paper investigates the use of a miniaturized filter based on a triangular lattice of holes in a photonic crystal (PhC) slab. The plane wave expansion method (PWE) and finite-difference time-domain (FDTD) techniques were utilized to analyze the dispersion and transmission spectrum, as well as the quality factor and free spectral range (FSR) of the filter. A 3D simulation has demonstrated that for the designed filter, an FSR of more than 550 nm and a quality factor of 873 can be attained by adiabatically coupling light from a slab waveguide into a PhC waveguide.
Article
Engineering, Electrical & Electronic
Li Liu, Chenggong Ma, Mengyuan Ye, Zhihua Yu, Wei Xue, Zhihao Hu, Jian Li
Summary: We propose and demonstrate a six-hole tapered silicon photonic crystal nanobeam cavity with a high theoretical Q factor and ultrasmall mode volume based on machine learning. The optimized cavity achieved an ultra-high theoretical Q factor and small mode volume through a combination of neural network and genetic algorithm. The experimental results showed a record high Q factor for a nanobeam cavity while maintaining a small size.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Hussein A. Elsayed, Arvind Sharma, Z. A. Alrowaili, T. A. Taha
Summary: A novel sensing tool based on a polymer defective one dimensional photonic crystal has been theoretically proposed in this study for highly accurate and sensitive pressure detection. By considering the strain sensitive refractive indices of photonic crystals constituent materials, a pressure sensor device has been realized, with the resonant mode inside the photonic bandgap showing very high sensitivity to pressure changes. The optimization of parameters of the one dimensional photonic crystals constituent materials has been analyzed to investigate the most possible performance, resulting in a relatively high sensitivity of the proposed sensor.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Partha Saha, Mrinal Sen
Summary: In this study, a two dimensional slotted photonic crystal cavity (2D-SPCC) was designed and optimized for sensing applications. It was incorporated in a silicon cantilever to form a nano-opto-electro-mechanical system (NOEMS) for detecting physical parameters like force, displacement, and strain. The results show a linear relationship between the resonant wavelength and the physical parameters, with high quality factor and sensitivity making it suitable for various industrial applications.
IEEE TRANSACTIONS ON NANOTECHNOLOGY
(2021)
Article
Mathematics, Applied
I. I. Yusipov, S. V. Denisov, M. V. Ivanchenko
Summary: This study explores quantum chaotic states that arise in a leaky cavity when the intracavity photonic mode is periodically pumped. It is found that the transition between regular and chaotic regimes can be moderated by placing a single spin inside the cavity and coupling it to the mode, allowing control over the degree of chaos.
Article
Materials Science, Multidisciplinary
Alexey Yu. Bobrovsky, Sergey Svyakhovskiy, Ilya V. Roslyakov, Alexey A. Piryazev, Dimitri A. Ivanov, Valery P. Shibaev, Martin Cigl, Vera Hamplova, Alexej Bubnov
Summary: Photo-tunable photonic structures filled with photochromic azobenzene-containing compounds were prepared and their properties were studied. Irradiation with polarized blue light resulted in spectral changes associated with photo-orientation of azobenzene moieties. The observed photoinduced split was reversible and could be fully recovered by heating. The prepared composites have great potential in photonics applications.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Optics
Feng Wu, Tingting Liu, Mingyuan Chen, Shuyuan Xiao
Summary: A new method is established in this study by combining one-dimensional photonic crystals with loss-free all-dielectric metamaterials to engineer the angle-dependence of photonic bandgaps. By introducing different defects into the designed structures, the angle-dependence of defect modes can be flexibly controlled. This approach opens a pathway for precisely engineering photonic bandgaps.
Article
Physics, Applied
Cai-Xing Hu, Si-Jia Guo, Hai-Feng Zhang
Summary: In this study, a RI sensor with superconducting photonic crystal in the terahertz regime was theoretically analyzed by the transfer matrix method, presenting an asymmetric resonance cavity and coupled wave theoretical model for optimization. The proposed sensing models achieve excellent performance over 80K, with sensitivity and figure of merit reaching high values at ultra-low temperatures. The performance indicators of the optimized model are dozens of times those of traditional photonic crystal RI sensors, providing theoretical guidance for the design of high-performance low-temperature RI sensors.
JOURNAL OF APPLIED PHYSICS
(2021)
