Second-harmonic reflectors on 128/spl deg/ LiNbO/sub 3/

Author

Lehtonen, Saku ; Plessky, Victor P. ; Koskela, Julius ; Salomaa, Martti M.

Volume

50

Issue

8

fYear

2003

Firstpage

972

Lastpage

978

Abstract

In this work, we study theoretically the operation of long surface acoustic wave reflectors, comprising a large number of electrodes, at the fundamental and second harmonic frequencies on the 128/spl deg/ LiNbO/sub 3/ substrate for various electrode thicknesses and metallization ratios. Numerical simulations utilizing tailored test structures and time gating indicate that the reflectivity of the second-harmonic reflectors can be very high for certain geometries. Furthermore, our simulations suggest that inside the stopband the total losses for the second harmonic are of the same order as those for operation at the fundamental harmonic.

Keywords

acoustic arrays; acoustic wave reflection; electrodes; harmonics; metallisation; reflectivity; surface acoustic wave devices; 128/spl deg/ LiNbO/sub 3/ substrate; LiNbO/sub 3/; electrode metallization ratios; electrode thicknesses; long SAW reflectors; long surface acoustic wave reflectors; reflectivity; second-harmonic reflectors; test structures; time gating; Aluminum; Electrodes; Fingers; Frequency; Gratings; Integrated circuit modeling; Physics; Reflection; Reflectivity; Surface acoustic waves;

fLanguage

English

Journal_Title

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on

Publisher

ieee

ISSN

0885-3010

Type

jour

DOI

10.1109/TUFFC.2003.1226541

Filename

1226541