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19 April 2024 |
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Optomechanical Transduction and Characterization of a Silica Microsphere Pendulum via Evanescent Light | | Ramgopal Madugani
; Yong Yang
; Jonathan M Ward
; Vu H Le
; Síle Nic Chormaic
; | | Date: |
19 Jan 2015 | | Abstract: | Transduction of the motion of a micron- or nano-sized object to an optical
signal is essential for optomechanical systems. Here, we study the optical
response of a cantilever-like, silica, microsphere pendulum, evanescently
coupled to a ?ber taper. In this system, the optical coupling element also acts
as the mechanical motion transducer and the pendulum’s oscillations modulate
the optical whispering gallery modes (WGMs) both dispersively and
dissipatively. This unique mechanism leads to an experimentally-observable,
asymmetric response function of the transduction spectrum. This phenomenon is
explained by using coupled mode theory with Fourier transforms. The
optomechanical transduction and its relation to the external coupling gap is
experimentally investigated in depth and shows good agreement with the theory.
A deep understanding of this mechanism is necessary in order to explore cooling
and trapping of a micropendulum system. | | Source: | arXiv, 1501.4461 | | Services: | Forum | Review | PDF | Favorites | |
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