Pyrolectric Liquid Crystal Materials for Uncooled IR Sensors

Abstract

We have developed new ferroelectric liquid crystalline materials with large pyroelectric coefficients (rho). Data on rho have been obtained using the Byer-Roundy technique that allows a direct determination of rho by ramping the temperature of the sample at a fixed rate. Our results show that the liquid crystalline materials developed by us exhibit rho values in the range of 30-150 nC/crm(2)K without any applied bias voltage, while rho values of 150-300 nC/cm(2)K have been observed in the presence of bias voltages. We also discuss the figure of merit of these materials for uncooled IR sensing applications.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1999
Accession Number
ADA390060

Entities

People

  • D. Shenoy
  • J. Naciri
  • K. Crandall
  • R. Shashidhar
  • S. Gray

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Coefficients
  • Crystals
  • Data Acquisition
  • Detectors
  • Dielectric Permittivity
  • Electric Fields
  • Engineering
  • Infrared Detectors
  • Liquid Crystals
  • Materials
  • Measurement
  • Military Research
  • Phase
  • Phase Transformations
  • Resistance
  • Transition Temperature
  • Transitions

Readers

  • Materials Science and Engineering.
  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.
  • Statistical inference.