Towards cavity optomechanics with integrated multi-element mechanical resonators
Examensarbete för masterexamen
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|Type: ||Examensarbete för masterexamen|
|Title: ||Towards cavity optomechanics with integrated multi-element mechanical resonators|
|Authors: ||Kolvik, Johan|
|Abstract: ||Cavity optomechanics describes the interaction between an intracavity light field and a mechanical resonator. This mutual coupling allows for a means to optically control mechanical motion down to the quantum regime. Using an optomechanical device to observe non-linear quantum effects, such as direct generation of non-classical states, requires the strong single photon-phonon coupling regime, which is yet to be experimentally realized for chip-based devices. Coupling light to the collective motion of an array of highly reflective mechanical resonators has been predicted to increase the coupling strength and is therefore a promising way forward in achieving this goal.
In this thesis, I present the first steps towards realizing cavity optomechanics with multielement membrane-type resonators fabricated from an AlGaAs heterostructure. The optical and mechanical properties of single- and double-layer resonators are characterized, showing resonance frequencies in the 100 kHz regime and room temperature mechanical quality factors of 10^4 at high vacuum. The reflectivity of the AlGaAs heterostructure is measured to be > 95 % at telecom wavelengths. The membrane devices are subsequently inserted as the back mirror of a 10 mm long Fabry-Pèrot-type cavity. This membrane-at-the-edge geometry shows a cavity linewidth of 6.38(8) MHz, corresponding to a finesse of 2370(30). Finally, an experimental setup for characterizing optomechanical properties is discussed, and its performance is analyzed in terms of cavity mirror impedance mismatch and membrane clipping loss.|
|Keywords: ||cavity optomechanics;AlGaAs heterostructures;micromechanical resonator;optical measurement;quantum optics|
|Issue Date: ||2021|
|Publisher: ||Chalmers tekniska högskola / Institutionen för mikroteknologi och nanovetenskap (MC2)|
|Collection:||Examensarbeten för masterexamen // Master Theses|
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