Pradhan, M. M. and Garg, R. K. and Arora, M. (1989) Studies on the domain wall coupling in the pyroelectric detector-modulator. Ferroelectrics , 94 (1). p. 465. ISSN 0015-0193

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Abstract

The infrared signal detected by a pyroelectric detector-modulator1 superimposes over the carrier frequencies, fed through an annular metallic ring formed near the front electrode of the pyroelectric detector. Electrodes of the detector and metallic ring are formed on the same chip of an unpoled single ferroelectric crystal. The coupling of the carrier frequency with the low frequency infrared signal has been demonstrated by various experiments and explained theoretically on the basis of electrical and mechanical solitary waves2 in the ferroelectric crystal. These solitary waves give rise to domain wall or electromechanical coupling. The electrical field of the carrier frequency causes growth of domains with polarisation aligned along carrier frequency field and the movement of the domain walls results in domain wall coupling. However, it is essential that the carrier frequency field should be greater than the threshold electric field of the ferroelectric crystal. In contrast to other modes of coupling, domain wall coupling is very efficient to modulate infrared signal through pyroelectric detector-modulator for remote transmission of the same.

Item Type:	Article
Subjects:	Materials Science Physical Chemistry/Chemical Physics Physics
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	01 Aug 2016 06:52
Last Modified:	01 Aug 2016 06:52
URI:	http://npl.csircentral.net/id/eprint/1687

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