Optical colorimetric LiTaO3 wafers for high-precision lithography on frequency control of SAW devices
Ming Hui Fang,
Yinong Xie,
Fangqi Xue
et al.
Abstract:Surface acoustic wave (SAW) resonators based on lithium tantalate (LT, LiTaO3) wafers are crucial elements of mobile communication filters. The use of intrinsic LT wafers typically brings about low fabrication accuracy of SAW resonators due to strong UV reflection in the lithography process. This hinders their resonance frequency control seriously in industrial manufacture. LT doping and chemical reduction could be applied to decrease the UV reflection of LT wafers for high lithographic precision. However, con… Show more
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