• Chinese Optics Letters
  • Vol. 20, Issue 2, 021201 (2022)
Chaoying Shi1, Xiuhong Liu1、*, Jinhua Hu2, Haiyan Han1, and Jijun Zhao2
Author Affiliations
  • 1School of Mathematics & Physics, Hebei University of Engineering, Handan 056038, China
  • 2School of Information & Electrical Engineering, Hebei University of Engineering, Handan 056038, China
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    DOI: 10.3788/COL202220.021201 Cite this Article
    Chaoying Shi, Xiuhong Liu, Jinhua Hu, Haiyan Han, Jijun Zhao. High performance optical sensor based on double compound symmetric gratings[J]. Chinese Optics Letters, 2022, 20(2): 021201 Copy Citation Text show less

    Abstract

    A high performance optical sensor based on a double compound symmetric gratings (DCSGs) structure is designed. The reflection spectrum of the DCSG is investigated by utilizing a method that combines a theoretical model with the eigenmode information of the grating structure. The theoretical results, which are observed to agree well with those acquired by rigorous coupled-wave analysis, show that the linewidth of the reflection spectrum decreases upon the increasing distance between the grating strips. This research work will lay a foundation for studying high performance integrated optical sensors in miniature nanostructures.

    1. Introduction

    Optical biosensors are needed in many fields, such as biomolecular testing[1,2], chemical analyses[3], and environmental monitoring[4]. Many kinds of optical technologies have been proposed to achieve high performance optical biosensors in recent years, including surface plasmon resonance (SPR)[5] and guided-mode resonance (GMR) biosensors, typically. In 1993, Wang and Magnusson discovered the GMR effect of periodic waveguide gratings[6]. This effect means that when the phase of the incident light wave matches the guiding mode of the grating, a sharp resonant peak will appear in the output spectrum due to the modulation of the grating structure. In 2000, a new type of GMR device integrating a waveguide grating with a subwavelength period on the endface of an optical fiber was proposed by Wawro et al.[7]. In addition, the advantages of no fluorescent labeling, easy integration, and real-time detection have made GMR-based grating sensors widely used in biomedical sensing[8,9]. In 2005, Magnusson et al. described the characteristics of GMR and demonstrated their utility in biosensors[10]. However, for now, GMR-based grating sensors still have some shortcomings. Some cannot be adapted to high sensitivity detection environments because of low sensitivity[11,12]; some have difficulty achieving high performance optical sensing owing to low figure of merit (FOM)[13,14]. On the other hand, the complex structure and demanding fabrication process make it difficult to achieve mass production of these devices. In order to solve these problems, we have designed an optical sensor based on a double compound symmetric gratings (DCSGs) structure, which simply means that a compound waveguide grating (CWG) structure is added to a dual-grating (DG) structure[15].

    Chaoying Shi, Xiuhong Liu, Jinhua Hu, Haiyan Han, Jijun Zhao. High performance optical sensor based on double compound symmetric gratings[J]. Chinese Optics Letters, 2022, 20(2): 021201
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