A Smart Material for Infrared Modulation Applied to IR Sensor

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Authors
  1. Paradis, S.
Corporate Authors
Defence R&D Canada - Valcartier, Valcartier QUE (CAN)
Abstract
Vanadium dioxide (VO2) is a smart material that offers substantial potential to modulate incident infrared radiation. Its property changes upon phase transition make it an attractive solution as a non-mechanical optical/electrical shutter or functional component in electro-optic systems. The purpose of this document is to report our latest results on the fabrication and characterization of the smart material VO2 deposited by magnetron radio-frequency sputtering technique. The specific properties under study are the temperature of phase transition Tt, electrical resistivity, and optical transmittance and reflectance in the longwave infrared (LWIR) range. Tungsten (W) dopant was used to tailor the optical properties of VO2. Films with tungsten concentrations of 1.8, 3.3 and 4.1at.% were studied. The results indicate a shift of Tt from 65°C for undoped film to room temperature (~19°C) for the 1.8at.% W film. The resistivity drop after phase transition for the 1.8at.% W films is 1.5 orders of magnitude compared to 3 orders of magnitude for the undoped films. With concentrations of >3.3at.% W, no phase transition was seen in the temperature range under study. For undoped films, the optical transmittance and reflectance contrast (namely the percentage of transmittance below Tt minus the percentage of the transmittance above Tt) at an IR wavelength of 8 μm are ~80% and ~ 40%, respectively. These valu

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Keywords
optical shutter;vanadium dioxide;IR modulation;doped thin films;smart material
Report Number
DRDC-VALCARTIER-TR-2008-160 — Technical Report
Date of publication
01 Oct 2008
Number of Pages
44
DSTKIM No
CA031470
CANDIS No
530384
Format(s):
CD ROM

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