Physics – Optics
Scientific paper
2009-07-31
Optics Express, Vol. 17, Issue 22, pp. 20078-20098 (2009)
Physics
Optics
25 pages, 9 figures
Scientific paper
10.1364/OE.17.020078
Periodically structured materials can sustain both optical and mechanical excitations which are tailored by the geometry. Here we analyze the properties of dispersively coupled planar photonic and phononic crystals: optomechanical crystals. In particular, the properties of co-resonant optical and mechanical cavities in quasi-1D (patterned nanobeam) and quasi-2D (patterned membrane) geometries are studied. It is shown that the mechanical Q and optomechanical coupling in these structures can vary by many orders of magnitude with modest changes in geometry. An intuitive picture is developed based upon a perturbation theory for shifting material boundaries that allows the optomechanical properties to be designed and optimized. Several designs are presented with mechanical frequency ~ 1-10 GHz, optical Q-factor Qo > 10^7, motional masses meff 100 femtograms, optomechanical coupling length LOM < 5 microns, and a radiation-limited mechanical Q-factor Qm > 10^7.
Chan Jasper
Eichenfield Matt
Painter Oskar
Safavi-Naeini Amir H.
Vahala Kerry J.
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