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Arithmetic logic unit based on the metastructure with coherent absorption

OPTICS LETTERS 2023年第21期48卷 5699-5702页

作者： Zou, Jia-hao Sui, Jun-yang Chen, Qi Zhang, Hai-feng Nanjing Univ Posts & Telecommun Coll Elect & Opt Engn Nanjing 210023 Peoples R China Nanjing Univ Posts & Telecommun Coll Flexible Elect Future Technol Nanjing 210023 Peoples R China

An arithmetic logic unit (ALU) based on the metastruc-ture (MS) with coherent absorption (CA) is proposed in this Letter. The ALU can perform AND and exclusive OR logical operations at the same frequency point. So it can be regarded as an optical half-adder. By controlling the chemical potential of graphene and the phase difference of coherent electromagnetic waves (EWs), two different binary numbers are input into the ALU. The dynamic absorption peaks, which are generated based on the CA, output the out-comes of the carry-digit bit and non-carry sum bit. This ALU can be used in the field of optical processing and encryption, such as processing hamming code. This given ALU based on the MS with CA has major implications for advancing the study and investigation into the application of CA. Further-more, it also provides a new, to the best of our knowledge, idea for the study of MS with logical operation. (c) 2023 Optica Publishing Group

关键词： finite-difference time-domain method Fourier optics and optical processing Graphene Optical encryption Optical fields Reflection coefficient

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Sub-10 fs unipolar pulses of a tailored waveshape from a multilevel resonant medium

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OPTICS LETTERS 2023年第24期48卷 6504-6507页

作者： Pakhomov, Anton Rosanov, Nikolay Arkhipov, Mikhail Arkhipov, Rostislav St Petersburg State Univ St Petersburg 199034 Russia Ioffe Inst St Petersburg 194021 Russia

We theoretically demonstrate the possibility to tune the temporal waveform of unipolar pulses of femtosecond duration emitted from a multilevel resonant medium. This is achieved through the control of the medium response by a properly adjusted sequence of half-cycle unipolar or quasi-unipolar driving pulses and the spatial density profile of resonant centers along the medium layer. We show the production of unipolar optical pulses of varying profiles, like rectangular or triangular ones, from an extended layer of a multilevel medium.(c) 2023 Optica Publishing Group

关键词： Attosecond pulses Femtosecond lasers Femtosecond pulses finite-difference time-domain method Optical rectification Ultrafast lasers

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Light blocking and phase modulation based on thermo-plasmonic hotspots in WS2 monolayer

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OPTICAL MATERIALS EXPRESS 2023年第11期13卷 3405-3415页

作者： Hamodi, Hayder Maki Fyath, Raad Sami Hamidi, Seyedeh Mehri Al Nahrain Univ Coll Engn Dept Laser & Optoelect Engn Baghdad Iraq Al Nahrain Univ Coll Engn Dept Comp Engn Baghdad Iraq Shahid Beheshti Univ Magneto Plasmon Lab Tehran Iran Shahid Beheshti Univ Plasma Res Inst Tehran Iran

Here we demonstrate light blocking and phase modulation in nano-plasmonic donate shape rings based on the thermo-plasmonic effect in these structures. For this purpose, we use a laser writing system to fabricate nanohole arrays and cover them with plasmonic gold thin film via a sputtering machine. The chemical vapor deposition method is also used to produce a WS2 layer, which is suitable for light blocking and phase modulation due to the nonlinearity of this two-dimensional material. After theoretically and experimentally evaluating the plasmonic donate-shaped substrate, we use the ellipsometric method to characterize the optical modes of the samples and record the switching manner and light-blocking phenomena under the probe laser excitation set to 980 nm. Our results show phase modulation based on the thermo-plasmonic effect of nano gap in donated double rings and light blocking by thermal expansion of the WS2 layer, which can open new insight into plasmon and two-dimensional material-based devices.(c) 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

关键词： Chemical vapor deposition finite-difference time-domain method Light matter interactions Localized surface plasmon resonance Phase modulation Thin films

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Sub-wavelength thick ITO-incorporated PCF based biosensor for non-invasive sensing of glucose and urea

OPTICS CONTINUUM

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OPTICS CONTINUUM 2023年第11期2卷 2436-2450页

作者： Islam, Mohammad Atiqul Islam, Sharnali Ali, Khaleda Univ Dhaka Semicond Technol Res Ctr Dhaka Bangladesh Univ Dhaka Dept Elect & Elect Engn Dhaka Bangladesh

This study presents an ultrathin indium tin oxide coated photonic crystal fiber (PCF) incorporated biosensor, suitable for sensing glucose and urea from in-vitro samples. The proposed device detects analytes with refractive indices spanning from 1.32 to 1.36 with maximum amplitude sensitivity of 231 RIU-1. A peak wavelength sensing capability of 12,000 nm/RIU at near-infrared spectrum (1400-2000nm) has also been achieved. Our design incorporates miniature air holes in the PCF to excite core-guided mode and one-tenth of the operating wavelength thick indium tin oxide (ITO) based cladding as the adaptive plasmonic surface. Air gaps in an "X" pattern, etched along the cross-sectional plane of the PCF, enhance the phase coherence between the plasmonic and the core-guided mode for Y polarized light for a narrow spectrum, ensuring higher Q-factor and hence greater sensitivity. The design is characterized using finite element method (FEM) with sensor resolutions as high as 8.33 x 10-6 RIU.

关键词： Chemical sensors Dielectric waveguides Effective refractive index finite-difference time-domain method Indium tin oxide Sensor performance

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Inverse-designed CWDM demultiplexer operated in O-band

Inverse-designed CWDM demultiplexer operated in O-band

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Optical Fiber Communications Conference and Exhibition (OFC)

作者： Cheung, Alfred K. C. Gadepalli, Krishna Guan, Jian Hoenselaar, Andreas Meng, Yang Menshov, Anton Petykiewicz, Jan Serey, Xavier Stucki, Rhett Verslegers, Lieven Wang, Jiahui Watson, Phil Williamson, Ian A. D. Wu, Yi-Kuei Ryan X Moonshot Factory 100 Mayfield Ave Mountain View CA 94043 USA Google LLC 1600 Amphitheatre Pkwy Mountain View CA 94043 USA

We introduce an inverse designed silicon 4-channel CWDM demux with mean worst insertion loss of 2-3.3 dB and mean worst crosstalk of 19-26 dB. Variability and predictability are demonstrated using a commercial CMOS pr... 详细信息

ISBN: (纸本)9798350377583

关键词： Crosstalk finite-difference time-domain method Photonic devices Silicon Silicon photonics Wavelength division multiplexing

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Arithmetic logic unit based on the metastructure with coherent absorption: erratum

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OPTICS LETTERS 2024年第3期49卷 415-417页

作者： Zou, Jia-Hao Sui, Jun-Yang Chen, Qi Zhang, Hai-Feng Nanjing Univ Posts & Telecommun Coll Elect & Opt Engn Nanjing 210023 Peoples R China Nanjing Univ Posts & Telecommun Coll Flexible Elect Future Technol Nanjing 210023 Peoples R China

We present a corrigendum to our Letter [Opt. Lett. 48, 5699 (2023)]. In section 3 of the original supplementary material, the absolute value is incorrectly taken in resolving the Kubo formula for describing the conductivity of graphene. Because this is a mistake with the conductivity of graphene, the coupling of the original structure is broken when the correct result is inserted into the code of the transfer matrix. So, the structure of the arithmetic logic unit (ALU), characteristic frequency point, and phase control have been modified accordingly. However, the ultimate function and the conclusion of this work remain unchanged. (c) 2024 Optica Publishing Group

关键词： Display technology finite-difference time-domain method Graphene Materials Phase

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A Grating Coupler With High Coupling Efficiency and Large Bandwidth for Silicon-on-Insulator Technology

A Grating Coupler With High Coupling Efficiency and Large Ba...

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Optical Fiber Communications Conference and Exhibition (OFC)

作者： Schweikert, Christian Nau, Simon Hoppe, Niklas Vogel, Wolfgang Berroth, Manfred Rademacher, Georg Univ Stuttgart Inst Elect & Opt Commun D-70569 Stuttgart Germany Q ANT GmbH D-70565 Stuttgart Germany

Conventional grating couplers show a tradeoff between low-loss and broadband operation. By using the interference of counter-propagating waves, we demonstrate a grating coupler design with a simulated coupling efficie... 详细信息

ISBN: (纸本)9798350377583

关键词： Coupling efficiency Destructive interference Fiber waveguides finite-difference time-domain method Grating coupler Single mode fibers

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Optical Refractive Index Sensors Based on Plasmon-Induced Transparency phenomenon in a Plasmonic Waveguide Coupled to Stub and Nano-disk Resonators

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PLASMONICS 2023年第1期18卷 255-270页

作者： Khani, Shiva Afsahi, Majid Semnan Univ Fac Elect & Comp Engn Semnan Iran

Plasmon-induced transparency (PIT) in the transparent window provides new insights into the design of optical devices such as optical sensors. Therefore, in this paper, four novel structures based on the PIT phenomenon are proposed to design plasmonic refractive index sensors (RISs). The designed structures consist of metal-insulator-metal (MIM) waveguides, stub resonators (SR), and nano-disk resonators (NDRs) containing metal strips (MSs). By using an MIM waveguide, an SR, and an NDR containing MSs, the first RIS (main RIS) is designed and simulated using the finite difference time domain (FDTD) method. To verify FDTD simulations, the stub-coupled MIM waveguide system which is used to design the main RIS is analyzed using the transmission line method (TLM). The maximum sensitivity and FOM of the main RIS obtain 725.1 nm/RIU and 91.78 RIU-1, respectively. By coupling two SRs, two NDRs containing MSs, and two SRs and NDRs containing MSs simultaneously, the other three RIS structures are designed. Increasing Q factors of the designed RISs results in higher FOM values for these new structures. The maximum FOM values for RIS I, RIS II, and RIS III are achieved at 120.18, 144.27, and 113.07 RIU-1, respectively.

关键词： Surface plasmon polaritons Stub resonator Nano-disk resonator Metal strips Plasmonic refractive index sensor Plasmon induced transparency finite-difference time-domain method

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Compact on-chip THz circular polarization detectors with high discrimination based on chiral plasmonic antennas

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OPTICAL MATERIALS EXPRESS 2023年第11期13卷 3330-3341页

作者： Li, Fangzhe Chu, Zeshi Zhou, Jing Deng, Jie Shen, Jinyong Zhu, Tianyun Jing, Wenji Dai, Xu Ye, Jiexian Chen, Xiaoshuang Chinese Acad Sci Shanghai Inst Tech Phys State Key Lab Infrared Phys Shanghai 200083 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China ShanghaiTech Univ Sch Phys Sci & Technol Shanghai 201210 Peoples R China

THz circular polarization detection is an important technology in many applications of THz waves. With the ongoing miniaturization of optoelectronic systems, there is an increasing demand for compact on-chip THz circular polarization detectors. Here, we propose what we belive to be a novel device of this kind based on the composite structure of quantum well (QW) infrared detection material sandwiched by a chiral plasmonic antenna array and a metal plane. Due to the circular polarization dependent light coupling discrimination provided by the cavity enhanced chiral antenna and the second polarization selection of the QWs, a circular polarization extinction ratio as high as 25 is achieved, surpassing all reported on-chip THz circular polarization detectors. Due to the field enhancement at the QWs, the absorption for the principle circular polarization is 15 times higher than a standard reference. The absorption peak can be tuned over the range from 6.41 to 6.56 THz, while considerable absorption enhancement and high circular polarization discrimination are preserved even under non-normal incidence. Our proposed device's structure is compatible with the QWIP focal plane array and has far-reaching application prospects opens a new avenue to the development of high-performance compact on-chip THz circular polarization detectors.

关键词： Circular polarization Effective medium theory Extinction ratios Field enhancement finite-difference time-domain method Infrared detectors

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High sensitivity meta-surface plasmonic sensor 19

High sensitivity meta-surface plasmonic sensor

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Conference on Silicon Photonics XIX

作者： Sayed, Mostafa Maher, Abdullah Ghanim, AbdelRahman M. Yahia, Ashraf Swillam, Mohamed. A. Amer Univ Cairo Branch Dept Phys New Cairo Egypt Ain Shams Univ Fac Sci Dept Phys Cairo 11566 Egypt

ISBN: (纸本)9781510670433;9781510670426

Surface Plasmon Polariton resonant sensors (SPPs) have found wide-ranging applications, particularly for nanoscale sensing. The SPP dispersion is determined by the properties of a limited number of suitable metals and cannot be arbitrarily tuned. The proposed gas sensor is based on surface plasmon polariton manipulated in the metamaterial surface. The plasmonic sensor utilizes a metal-air interface to detect and analyze various substances and phenomena in the mid-infrared range. The utilization of the Mid-infrared (MIR) wavelength range offers numerous benefits across a wide range of applications, including chemical and biological detection. This paper introduces a metasurface composed of highly doped silicon that demonstrates a plasmonic effect in the mid-infrared wavelength range. Silicon has several benefits, including compatibility with CMOS technology and easy manufacturing utilizing traditional silicon fabrication techniques. In addition, operating in the mid-infrared (mid-IR) range and using doped silicon material enables the development of integrated plasmonic devices at the microscale. In this paper, a meta surface plasmonic grating is proposed for sensing and detecting the refractive index changes. In order to test the performance of the plasmonic sensor, a commercial Lumerical software based on finite difference time domain (FDTD) has been used. The suggested design shows high sensitivity at lambda = 13.9807 mu m and it can be used for gas sensing applications.

关键词： Plasmonic sensors Refractive index Silicon Reflection Sensors Mid infrared Metals Design finite-difference time-domain method Physics

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