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Piezoelectric and ferroelectric devices

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Determination of depth of proton exchanged layer in LiNbO3 from laser induced pyroelectric signals
Author(s): S. Tuli, A.B. Bhattacharyya
Source: Electronics Letters, Volume 29, Issue 8, April 1993, p. 708 - 710
Type: Article
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A new nondestructive technique for the determination of the depth of the proton exchanged (PE) layer in LiNbO3 is reported. The techniques relies on the difference in phase of measured pyroelectric voltages, induced by a modulated laser beam incident on the exchanged and unexchanged regions. Measurements of PE layer thickness in a Z-cut LiNbO3 sample have been corroborated by prevalent, more elaborate, optical characterisation techniques.

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Model for s.a.w. scattering by i.d.t. and its application to s.a.w. track changer
Author(s): P. Sudhakar, A.B. Bhattacharyya
Source: IEE Journal on Microwaves, Optics and Acoustics, Volume 3, Issue 3, 1979 , p. 128 - 132
Type: Article
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A superposition model for surface-acoustic-wave (s.a.w.) scattering by an interdigital transducer (i.d.t.) has been developed. In essence, it consists of two steps, (a) The incident s.a.w. induces a voltage across the i.d.t. (b) The bidirectionally radiated s.a.w., due to this induced voltage, is superposed with the incident s.a.w. to yield the scattered s.a.w. field. It is shown to considerably simplify the s.a.w. scattering parameter calculations for i.d.t. The results agree with earlier observations. Scattering parameter calculations of nonuniformly illuminated, resonantly loaded hybrid-junction i.d.t.s (r.l.h.i.d.t.) show that (i) s.a.w.s are unidirectionally radiated over the unilluminated part of the h.i.d.t. and (ii) it is described by a (track-changing) transfer function of bandpass type, with flat bandwidths up to 20% of nearly 0 dB loss, under appropriate conditions. The r.l.h.i.d.t. track changer should, therefore, be useful in realising long delay lines. The attractive feature of the r.l.h.i.d.t. as an s.a.w. track changer is that its implementation is practically feasible even on a low piezoelectric-coupling substrate like ST quartz. However, its main disadvantages are the requirement of (a) multilevel high-resolution lithography and (b) the additional high-Q tuning inductors for resonant loading.

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S.A.W. bandpass filter with −50 dB sidelobes using unweighted i.d.t.s
Author(s): P. Sudhakar, A.B. Bhattacharyya, Bimal Mathur
Source: Electronics Letters, Volume 14, Issue 14, July 1978, p. 437 - 439
Type: Article
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The use of a resonantly loaded i.d.t. (r.l.i.d.t.) as an s.a.w. track changer in bandpass filter design is described. A filter with 3dB fractional bandwidth (f.b.w.) of 11.5% and −50 dB sidelobes is realised using unweighted input/output i.d.t.s of 5½ finger pairs each and a 7½ finger pair r.l.i.d.t. as the s.a.w. track changer. The scheme is expected to be useful in realising low-shape-factor low-sidelobe bandpass filters using relatively short i.d.t.s.

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