| Title |
Optimization of Slanted and Chirp IDT Configurations for Realizing and Propagating Surface Acoustic Wave with Wide Bandwidth |
| Authors |
이태윤(Lee, Tae-Yoon) ; 푸첸(Fu, Chen) ; 이기근(Lee, Kee-Keun) |
| DOI |
https://doi.org/10.5370/KIEE.2013.62.12.1730 |
| Keywords |
Surface acoustic wave (SAW) ; Wide bandwidth ; Interdigital transducer (IDT) ; Slant ; chirp ; Lithium niobate |
| Abstract |
Slanted and chirp interdigital transducer(IDT) configurations were studied for generating the surface acoustic wave(SAW) with wide bandwidths on a piezoelectric substrate. These devices can be applied to manipulate optical path of light along the waveguide, ultimately used for optical switches and holographic image implementation. Prior to fabrication, the coupling of modes(COM) modeling and simulation were performed to extract optimal design parameters. The optimally designed wideband device showed wide bandwidth of 30MHz, low insertion loss of -25dB, and abrupt side suppression ratio (SSR). Several design conditions were determined during device implementation, such as slanted angle, aperture length, number of fingers, and central frequencies of IDTs. These factors were experimentally analyzed and described in details in this paper. |