High-frequency optoacoustic transmitter based on nanostructured germanium via metal-assisted chemical etching
OPTICAL MATERIALS EXPRESS(2016)
摘要
We propose the use of nanostructured germanium (Ge) fabricated by simple metalassisted chemical (MAC) etching as a high-frequency optoacoustic ultrasound transmitter. As an acoustic transfer medium, an elastomeric polymer, polydimethylsiloxane (PDMS), is spin-coated on top of Ge nanostructures, which is prepared with three different thicknesses with various MAC etching time in order to compare optoacoustic conversion efficiency. Under pulsed laser excitation, the Ge transmitter generates ultrasound pressure of 7.5 times stronger than that of Cr reference with comparable high frequency spectra (primary: 15 MHz and 6dB roll-off at 27 MHz) to CNT-PDMS composite. Considering its simple fabrication process without substrate limitation, the nanostructured Ge overlaid with PDMS can offer a promising approach for a highly efficient optoacoustic transmitter and toward all-optical high-frequency ultrasound transducers. (C) 2016 Optical Society of America
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