[14p-K304-1~16] 3.7 Optical measurement, instrumentation, and sensor

2:00 PM - 2:15 PM JST(5:00 AM - 5:15 AM UTC)

[14p-K304-2] Highly sensitive and contact-free measurement of thermal fluctuation of ripplon in water droplet using a high-Q optical cavity

〇Motoki Asano¹, Riku Takahashi^1,2, Koji Sakai^1,2, Aya Tanaka^1,2, Hiroshi Yamaguchi¹, Hajime Okamoto¹ (1.NTT BRL, 2.NTT BMC)

Keywords:

Cavity optomechanics,Ripplon

By using light strongly confined in an optical cavity, the interaction with a solid-state mechanical resonator is enhanced and the mechanical vibration can be measured in the standard quantum limit. However, it has been difficult to use a resonator for vibration measurement of a liquid in which the optical Q factor of the cavity is significantly degraded by light scattering and absorption. We demonstrated a cavity-enhanced measurement of surface tension waves (ripplons) generated by the surface tension of water droplets as vapor fluctuations, and succeeded in measuring nanometer-scale thermal fluctuations.