16 September 2016 Optically driven self-oscillations of a silica nanospike at low gas pressures
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Abstract
We report light-driven instability and optomechanical self-oscillation of a fused silica “nanospike” at low gas pressures. The nanospike (tip diameter 400 nm), fabricated by thermally tapering and HF-etching a single mode fiber (SMF), was set pointing at the endface of a hollow-core photonic crystal fiber (HC-PCF) into the field created by the fundamental optical mode emerging from the HC-PCF. At low pressures, the nanospike became unstable and began to self-oscillate for optical powers above a certain threshold, acting like a phonon laser or "phaser". Because the nanospike is robustly connected to the base, direct measurement of the temporal dynamics of the instability is possible. The experiment sheds light on why particles escape from optical traps at low pressures.
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Shangran Xie, Riccardo Pennetta, Roman E. Noskov, Philip St. J. Russell, "Optically driven self-oscillations of a silica nanospike at low gas pressures", Proc. SPIE 9922, Optical Trapping and Optical Micromanipulation XIII, 99220A (16 September 2016); doi: 10.1117/12.2236656; https://doi.org/10.1117/12.2236656
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