Multichannel cavity optomechanics for all-optical amplification of radio frequency signals

Abstract

optomechanical phenomena in photonic devices provide a new means of light-light interaction mediated by optical force actuated mechanical motion. In cavity optomechanics, this interaction can be enhanced significantly to achieve strong interaction between optical signals in chip-scale systems, enabling all-optical signal processing without resorting to electro-optical conversion or nonlinear materials. However, current implementation of cavity optomechanics achieves both excitation and detection only in a narrow band at the cavity resonance. This bandwidth limitation would hinder the prospect of integrating cavity optomechanical devices in broadband photonic systems. Here we demonstrate a new configuration of cavity optomechanics that includes two separate optical channels and allows broadband readout of optomechanical effects. The optomechanical interaction achieved in this device can induce strong but controllable nonlinear effects, which can completely dominate the device's intrinsic mechanical properties. utilizing the device's strong optomechanical interaction and its multichannel configuration, we further demonstrate all-optical, wavelengthmultiplexed amplification of radio-frequency signals.

Single laser modulated drive and detection of a nano-optomechanical cantilever

“…This would especially be true at large device displacements where the linear assumption of the transduction coefficient no longer holds, analogously to the force dependence on device displacement. 28 This may affect the measured signal which is especially important to take into account when using such devices in a sensor environment.…”

“…3) (supplementary material) the peak magnitudes scale supralinearly with the AC drive, in contrast to the DC background. This could occur if the optical gain factor, or force, on the nanomechanical beam increases at higher drive powers and beam deflections, 28 or if the transduction coefficient increases and is no longer linear itself.…”

A one-dimensional optomechanical crystal with a complete phononic band gap

“…As the establishment of cavity optomechanics [1][2][3] , the transduction of phonons through light has led to a wide variety of applications in sensing [4][5][6] and communications [7][8][9][10] . Moreover, the manipulation of mechanical degrees of freedom with light, with reported demonstrations of energy transfer from photons to phonons (amplification 11 ) and from phonons to photons (sideband resolved OM cooling 12,13 ), has paved the way towards the coherent quantum control of a mechanical oscillator [14][15][16][17][18] .…”

Controllable optomechanical coupling in serially-coupled triple resonators

“…13,14 The mostly studied optomechanical device consists of a single resontor system, where one optical resonant mode couples to the mechanical mode. [15][16][17][18][19][20][21][22][23][24] Generally, different optical modes will all couple to the mechanical mode that modifies the effective light path in a single resonator system, since the displacement of this mechanical mode has the overlap with different optical modes and thus changes the optical resonance conditions.…”