High resolution and wide dynamic range pressure sensor based on two-dimensional photonic crystal

Saeed Olyaee,Ali Asghar Dehghani

doi:10.1007/s13320-011-0044-1

Saeed Olyaee, Ali Asghar Dehghani

Open Access

https://doi.org/10.1007/s13320-011-0044-1

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Journal: Photonic Sensors	Publication Date: Nov 19, 2011
Citations: 80	License type: CC BY 2.0

Affiliation: Shahid Rajaee Teacher Training University

Abstract

The authors present a new design of high resolution and wide dynamic range photonic crystal pressure sensor. This sensor is based on two-dimensional photonic crystal with square array of silicon rods surrounded by air. The sensor consists of a photonic crystal waveguide which is coupled to a photonic crystal nanocavity. The waveguide is configured by removing one row of Si rods and nanocavity is formed by modifying the radius of one Si rod. The sensor is designed for 1300 nm–1400 nm wavelengths. Simulation results show that resonant wavelength of nanocavity is linearly shifted to larger wavelengths by increasing the pressure. The designed sensor has a linear behavior between 0.1 GPa to 10 GPa of applied pressure and 8 nm/GPa of pressure sensitivity.

Highlights

Since the last decade, photonic crystals (PhCs) have been attractive optional structures for controlling and manipulating the light
The authors present a new design of high resolution and wide dynamic range photonic crystal pressure sensor
This sensor is based on two-dimensional photonic crystal with square array of silicon rods surrounded by air

Summary

Introduction

Photonic crystals (PhCs) have been attractive optional structures for controlling and manipulating the light. The PhCs are the periodic microstructures with a period in order of optical wavelength that the refractive index of material changes in one, two, or three directions. Their inherent properties, such as photonic band gap (PBG), reflectance-transmittance, high design flexibility, and possibility to be made in nanometer range, make it possible to utilize these structures in many applications such as waveguides, nano-resonators, photonic crystal fibers [1,2,3,4,5]. The resonant wavelength of nanocavity is a function of shape, dimension, and surface state of defects This point is a fundamental work of pressure sensor. We propose a novel, linear, and high resolution pressure sensor

Principle of the pressure sensor

Design of PhC sensor structure

Simulation results

Conclusions