Optical Fiber Sensors

7Liquid Crystal Optical Fibers for Sensing Applications

Sunish Mathews and Yuliya Semenova

Contents

7.1 Introduction

7.2 Tunability of LC-Filled PCFs

7.2.1 LC Tunability

7.2.2 Tuning and Sensing Mechanism of LCPCFs

7.2.2.1 Effect of LC Infiltration on PCF Propagation

7.2.2.2 Electrical Tuning of Photonic Bandgaps of LCPCF

7.3 Electric Field Sensing Using LCPCFs

7.3.1 All-Fiber Probe for E-Field Parameters

7.3.1.1 Miniature Electric Field Sensing Probe

7.3.1.2 Measurement of Electric Field Intensity

7.3.1.3 Applied E-Field Frequency Response of LCPCFs

7.3.2 Polarimetric Electric Field Sensing Scheme

7.3.2.1 Polarimetric Electric Field Sensing Principle

7.3.2.2 Selective Infiltration and Infiltration Length Control

7.3.2.3 Electric Field Directional ...