| 研究課題/領域番号 |
16F16786
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| 研究機関 | 北海道大学 |
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研究代表者 |
O・B Wright 北海道大学, 工学研究院, 教授 (90281790)
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| 研究分担者 |
DEVAUX THIBAUT 北海道大学, 工学(系)研究科(研究院), 外国人特別研究員
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| 研究期間 (年度) |
2016-11-07 – 2019-03-31
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| キーワード | extraordinary / transmission / metamaterial / audio / ultrasonics / sound |
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| 研究実績の概要 |
We have demonstrated an Extraordinary-Transmission (ET)-based scanning acoustic microscope based on membrane resonance (MR) in the audio (up to 20 kHz) range (wavelength ~1-10 mm) with deeply sub-wavelength (<lamba/30) resolution. The microscope has a plastic membrane of diameter around 1 cm working at around 1000 Hz. We confirmed operation for topography measurement up to 15 mm distance. Linear scans were made of several materials to confirm lambda/20 resolution. We have also done simulations on GHz ET of longitudinal waves in nanoscale silicon bridges and confirmed the principle works with grooves at the input side. Similar simulations of GHz ET for surface acoustic waves have also been successful.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
Last year we demonstrated an Extraordinary-Transmission (ET)-based scanning acoustic microscope based on membrane resonance (MR) in the audio (up to 20 kHz) range (wavelength ~1-10 mm) with deeply sub-wavelength (<lamba/30) resolution. The microscope has a plastic membrane of diameter around 1 cm working at around 1000 Hz. We extended this work by making 2D images of two different structures: 1) a triangular sample of rubber less than 1 mm thick, and 2) a wooden cross about 10 mm thick. We confirmed operation for topography measurement up to 15 mm distance. We also confirmed lambda/300 resolution in the vertical direction and around lambda/20 resolution in the lateral direction, where lambda is the acoustic wavelength. We are also developing an analytical model of the microscope based on lumped impedances. We are in the process of writing a paper on these results.
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| 今後の研究の推進方策 |
We have also continued to do simulations on GHz ET of longitudinal waves in nanoscale silicon bridges and with grooves at the input or output side. We optimized the groove geometry to obtain a very high value of the transmission efficiency >100, surpassing our previous results for surface waves in similar silicon bridge structures. We in the process of writing a journal paper on these results.
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