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High Frequency GaAs Nano-Optomechanical Disk Resonator
Physical Review Letters, 105 (26): 263903+ (декабря 2010)
DOI: 10.1103/physrevlett.105.263903
Аннотация
Optomechanical coupling between a mechanical oscillator and light trapped in a cavity increases when the coupling takes place in a reduced volume. Here we demonstrate a GaAs semiconductor optomechanical disk system where both optical and mechanical energy can be confined in a subwavelength scale interaction volume. We observe a giant optomechanical coupling rate up to 100 GHz/nm involving picogram mass mechanical modes with a frequency between 100 MHz and 1 GHz. The mechanical modes are singled-out measuring their dispersion as a function of disk geometry. Their Brownian motion is optically resolved with a sensitivity of 10-17 m/√Hz at room temperature and pressure, approaching the quantum limit imprecision.
