Article
Chemistry, Physical
Xue Han, Jingkun Tian, Zongwen Li, Tiange Wu, Guangmin Ji, Shilei Li, Fei Xing, Yonghui Zhang
Summary: This study presents an optical refractive index sensor based on the polarization sensitive response of localized surface plasmon resonance (LSPR) in gold nanoparticles. The sensor demonstrates high sensitivity for detecting fluid species and hydraulic pressure. It has broad application potential in various scenarios.
APPLIED SURFACE SCIENCE
(2022)
Article
Optics
Siqing Dai, Jingyu Mi, Jiazhen Dou, Tongyao Yu, Mengmeng Zhang, Jianglei Di, Jiwei Zhang, Jianlin Zhao
Summary: In this study, a dual-wavelength surface plasmon resonance holographic microscopy (SPRHM) is proposed to measure the cell-substrate distance and cytoplasm refractive index simultaneously. The method utilizes phase-contrast surface plasmon resonance (SPR) images to demodulate the distributions of cell-substrate distance and cytoplasm refractive index. Experimental measurements on MDA-MB-231 cells and IDG-SW3 cells validate the feasibility of this approach, which provides a valuable tool in biological research.
Article
Optics
V. P. Kalosha, V. A. Shchukin, N. N. Ledentsov
Summary: This study theoretically analyzes the lateral localization of optical modes in microcavities, focusing on a model system using GaAs-GaAlAs materials. It demonstrates that thick metal bars on top of the DBR can strongly localize the modes laterally, with a high fraction of optical energy located in the air. These modes are nearly temperature-insensitive and can be used in various applications such as microlasers and resonant semiconductor optical amplifiers.
Article
Chemistry, Analytical
Carlos Angulo Barrios, Teona Mirea, Miguel Huerga Represa
Summary: We present a self-referenced refractive index optical sensor utilizing Au nanoislands. The device consists of randomly distributed Au nanoislands on a planar SiO2/metal Fabry-Perot cavity. Experimental and theoretical studies reveal that the spectral response of the sensor is due to a combination of localized surface plasmon resonance (LSPR) and the lowest-order anti-symmetric resonance of the Fabry-Perot cavity. This self-referenced sensor provides high sensitivity to refractive index variations of different fluids while maintaining a stable reference signal. The proposed sensor has a spectral sensitivity of 212 nm/RIU and an intensity sensitivity of 4.9 RIU-1, making it a promising candidate for compact biosensing optical platforms.
Article
Materials Science, Multidisciplinary
Hong Su, Huiting Lan, Shiping Feng, Shixing Wang, Min Zhang, Huawei Liang, Ling Li
Summary: In this paper, a novel terahertz refractive index sensor consisting of two asymmetric distributed Bragg reflectors (DBRs) attached to graphene in the cavity is proposed. Finite difference time domain simulation shows that Tamm plasmon polariton mode excited at the interface between the DBR and the graphene is coupled with the resonance modes of the cavity, leading to improved sensing performance. The optimized reflection spectra exhibit three dips at 1.04 THz, 3.00 THz, and 3.13 THz, with bandwidths of 1.82 GHz, 3.95 GHz, and 3.86 GHz respectively. The corresponding sensitivities and figure of merit are 1.02, 2.58, 3.00 THz/RIU and 559.34, 652.15, 776.17 RIU-1. The tri-band sensor, with its high sensing performance and simple structure, may open up new possibilities for detecting multimodal microscale analytes.
RESULTS IN PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Han Zhu, Lingrui Chu, Weijie Liu, Saulius Juodkazis, Feng Chen
Summary: The localized surface plasmon properties of metallic nanoparticles have led to nanoscale-enhanced applications in various fields. The assembly of plasmonic nanoparticles, controlled by laser-induced redistribution, allows for tailored optical responses and direct nano-printing inside transparent materials. This work paves the way for practical applications of plasmonic devices.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Physical
Kum-Song Ho, Song-Jin Im
Summary: We present a simple nanoscale refractive index sensor system and analyze its transmission response. The system consists of a rectangular nanocavity coupled to a metal-insulator-metal nanowaveguide. Theoretical analysis reveals that a square cavity can support a hybrid resonant mode with high quality factor and low transmission response. This nanoscale sensor has high sensitivity and figure of merit.
Article
Materials Science, Multidisciplinary
Denis Sakhno, Eugene Koreshin, Pavel A. Belov
Summary: The study focuses on the dispersion properties of an easy-to-manufacture metamaterial made of connected metallic wires, which supports longitudinal waves across a wide frequency band and exhibits unprecedentedly short wavelengths in comparison to the material's period.
Article
Nanoscience & Nanotechnology
Huimin Wang, Liqing Huang, Yu Zhang, Yakun Cai, Lin Cheng, Lipeng Zhai, You Liu, Xiangzhe Zhang, Jingping Zhu
Summary: A simple non-lithographic method was proposed to fabricate hierarchical Al nanopit arrays for deep ultraviolet refractive index sensing. By adjusting the Al deposition thickness on the array, tunable plasmonic properties in the DUV region were achieved.
Article
Chemistry, Multidisciplinary
Ning Su, Wei Luo, Liusan Wang, Zhengyong Zhang, Rujing Wang
Summary: A novel dual-wavelength method is presented in this study for fiber-optic SPR sensors to measure changes in refractive index and temperature simultaneously. The theoretical model established helps to analyze the temperature effect and validate the relationship between output signals and RI and temperature at specific wavelengths. The proof-of-concept experiment demonstrates the technical feasibility of the dual-wavelength method and its potential for practical application without requiring a specific sensor probe design structure.
APPLIED SCIENCES-BASEL
(2021)
Article
Optics
Jose Pinto, Ruben Aylwin, Gerardo Silva-Oelker, Carlos Jerez-Hanckes
Summary: In this paper, a first-order optimization strategy is proposed to maximize the diffraction efficiencies of multilayered diffraction gratings by approximating the underlying boundary integral equations for polarized electromagnetic fields. The parametric representation of structure interfaces and calculation of derivatives using shape calculus allow for straightforward implementation of gradient descent methods, showing efficacy in designing multilayered gratings to maximize diffraction efficiency in chirped pulse amplification.
Article
Optics
Fahad Ahmed Alzahrani, Vishal Sorathiya
Summary: This study presents a numerical investigation of a phase change material and MXene-based wide range refractive index sensor for the visible and infrared spectrum. The proposed three-layered structure consists of Ge2Sb2Te5, Ti3C2TX, silica, and silver materials. Reflectance responses of the multi-layered structures for refractive index ranges 1-2.2 are presented. The finite element method is used to simulate the overall design and the effect of different material heights on performance.
Article
Multidisciplinary Sciences
Hong Zhou, Zhihao Ren, Dongxiao Li, Cheng Xu, Xiaojing Mu, Chengkuo Lee
Summary: The failure of molecular identification due to the overlap of infrared vibrational fingerprints is a fundamental issue in infrared spectroscopy. This study investigates the coupling mode of localized surface plasmon and surface phonon polaritons to disentangle overlapping vibrational modes. The researchers find that the refractive index dependence of surface phonon polaritons vibrations effectively achieves high identification accuracy for strongly overlapping vibrational modes.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Pavel Psota, Jan Kredba, Marek Stasik, Jakub Necasek, Ondrej Matousek, Vit Ledl
Summary: This paper presents a technique for measuring the thickness of optical elements using absolute wavelength scanning interferometry. The technique is based on the Fizeau interferometer and utilizes data from three different tunable laser diodes to achieve a long effective wavelength range and low measurement uncertainty. The method can measure the thickness of both flat optical elements and lenses with curved surfaces. It provides areal information and high angle sensitivity for precise alignment and reduces misalignment errors. The results have been validated and cross-tested with other techniques, and the technique can be easily modified to measure other essential parameters of optical elements, replacing multiple single-purpose measuring devices while maintaining high accuracy.
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
Physics, Condensed Matter
Frank Tseng, Ergun Simsek, Daniel Gunlycke
JOURNAL OF PHYSICS-CONDENSED MATTER
(2016)
Article
Chemistry, Physical
Bablu Mukherjee, Ergun Simsek
Article
Optics
Bablu Mukherjee, Ergun Simsek
OPTICS COMMUNICATIONS
(2016)
Article
Nanoscience & Nanotechnology
Bablu Mukherjee, Binni Varghese, Minrui Zheng, Eng Soon Tok, Ergun Simsek, Chorng Haur Sow
NANOSCIENCE AND NANOTECHNOLOGY LETTERS
(2016)
Article
Multidisciplinary Sciences
B. Mukherjee, N. Kaushik, Ravi P. N. Tripathi, A. M. Joseph, P. K. Mohapatra, S. Dhar, B. P. Singh, G. V. Pavan Kumar, E. Simsek, S. Lodha
SCIENTIFIC REPORTS
(2017)
Article
Engineering, Electrical & Electronic
Ergun Simsek
Summary: This work investigates how different measurement setups affect the accuracy of machine learning algorithms in electromagnetic inversion problems and finds that deep learning outperforms other techniques. Increasing the number of antennas and avoiding uniform grids for training data sets can improve efficiency, and multifrequency training with fewer antennas leads to more accurate inversions.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Nanoscience & Nanotechnology
Masoud Soroush, Ergun Simsek, Gregory Moille, Kartik Srinivasan, Curtis R. R. Menyuk
Summary: In this study, the accuracy of three different neural network architectures in optimizing the design of ring resonators was examined. The use of attention-based neural networks allowed for predicting the coupling rate with over 90% accuracy for spectral ranges 6x wider than the training data. This significantly reduces computational burden and potential compute time by 6-fold for the design of broadband microresonators.
Article
Engineering, Electrical & Electronic
Ergun Simsek, Ishraq Md Anjum, Thomas F. Carruthers, Curtis R. Menyuk, Joe C. Campbell, David A. Tulchinsky, Keith J. Williams
Summary: Time window functions are used to obtain the output power spectrum of photodetectors. Numerical results agree well with experiments. The proposed method significantly reduces computing time and memory compared to traditional monochromatic calculations, allowing for high-performance photodetector design on desktop computers. Using this approach, a device with a 3-dB bandwidth four times larger than the initial design was successfully designed.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Ergun Simsek, Seyed Ehsan Jamali Mahabadi, Ishraq Md Anjum, Curtis R. Menyuk
Summary: The design parameters of a high-performance photodetector were optimized using the Nelder-Mead method to minimize phase noise, calculated with a logarithmic time evolution algorithm. The new design is thinner, faster, and has 6 dBc/Hz lower phase noise than the original design.
2021 ANNUAL CONFERENCE OF THE IEEE PHOTONICS SOCIETY (IPC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Bablu Mukherjee, Sandipta Roy, Ergun Simsek, Sayantan Ghosh, Venu G. Achanta, Saurabh Lodha
2018 IEEE PHOTONICS CONFERENCE (IPC)
(2018)
Proceedings Paper
Engineering, Electrical & Electronic
Ergun Simsek
2016 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM
(2016)
Proceedings Paper
Engineering, Electrical & Electronic
Bablu Mukherjee, Ergun Simsek
2016 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM
(2016)
Proceedings Paper
Engineering, Electrical & Electronic
Bablu Mukherjee, Ergun Simsek, Binni Varghese, Minrui Zheng
2016 USNC-URSI RADIO SCIENCE MEETING (JOINT WITH AP-S SYMPOSIUM)
(2016)
Proceedings Paper
Engineering, Electrical & Electronic
Ergun Simsek, Bablu Mukherjee
QUANTUM DOTS AND NANOSTRUCTURES: GROWTH, CHARACTERIZATION, AND MODELING XIII
(2016)
Article
Computer Science, Artificial Intelligence
Ergun Simsek
MACHINE LEARNING-SCIENCE AND TECHNOLOGY
(2020)
