Quantum optics and optomechanics with microtoroids

McRae, Terry Graham (2012). Quantum optics and optomechanics with microtoroids PhD Thesis, School of Mathematics and Physics, The University of Queensland.

       
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Author McRae, Terry Graham
Thesis Title Quantum optics and optomechanics with microtoroids
School, Centre or Institute School of Mathematics and Physics
Institution The University of Queensland
Publication date 2012
Thesis type PhD Thesis
Supervisor Warwick Bowen
Joachim Knittel
Total pages 165
Total colour pages 55
Total black and white pages 110
Language eng
Subjects 0206 Quantum Physics
020604 Quantum Optics
0205 Optical Physics
Formatted abstract
In this thesis we use the microtoroid whispering gallery mode optical resonator to facilitate the study of quantum optics and optomechanics. We start in the familiar domain of quantum optics and use standard coupled cavity modelling techniques to show that optical parametric amplification in microtoroids can be used to generate time delayed entanglement and propose a quantum memory based on this technique. To our knowledge this is the first proposal for time delayed entanglement in systems that are purely optical. This model also showed that maximum entanglement can be tuned away from the carrier frequency and also therefore from technical noise sources.

In chapter 4 we turn to practical issues of stabilization of the laser to the microtoroid cavity resonance and apply a technique, previously applied to microspheres, that uses optical feedback and the resonator thermal bistability to hold the microtoroid on resonance over 12 hours and reduce the linewidth of the laser to less than the 300 kHz resolution of our diagnostic equipment without any electronic feedback control.

The thermal bistability then proved critical in the demonstration of a phase sensitive amplifier where the phase sensitivity is caused by the dynamic interaction between the optical field and the mechanical structure of the microtoroid optical cavity (chapter 5). This optomechanical amplifier had a record amplification of 37 dB with 12 μW of optical input power and under different coupling conditions can alternatively act as a notch filter for radio frequency (RF) noise on the optical carrier wave.

The weak nature of radiation pressure for mechanical actuation was addressed by developing electrical gradient force actuation on the dielectric silica of the microtoroid structure. This enhanced mechanical actuation has enabled direct imaging (chapter 6) as well as cooling (not presented here) of the driven mechanical mode and may be a suitable technology for generating mechanical squeezed states.
Keyword Quantum optics
Quantum measurement
Cavity optoelectromechanical systems
Optomechanical cooling
Cavity optomechanics
Laser stabilization
Optical microcavity
Microtoroid
Microscopy
Entanglement

 
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Created: Mon, 22 Oct 2012, 16:48:12 EST by Terry Mcrae on behalf of Scholarly Communication and Digitisation Service