Optomechanics with Diamond Photonic Crystal Cavities

4 11/2013

Monday, 04 Nov. 2013, 16:00 - 17:00

Workgroup Aspelmeyer Group

Presenter: Laura Kipfstuhl, Universität des Saarlandes, Saarbrücken, D
Host: M. Aspelmeyer
Where: Schrödingerzimmer, 4th floor, Boltzmanngasse 5, 1090 Wien

The simultaneous localization of photons and phonons in one cavity allows for the coupling of optical and mechanical modes. One promising system to achieve optomechanical interaction is a combination of photonic and phononic crystal cavities. The small mode volume of this resonator type provides a strong spatial localization of the optical and mechanical fields whereas an advanced cavity design can yield very high quality factors for both the optical and the mechanical mode.

Diamond is a promising material for this application as it has favourable optical properties in the visible range as well as a very high Young’s modulus. In addition, diamond is a host for a number of colour centers with promising applications in quantum information.

In FDTD simulations we find optical modes with mode volumes of ~1(λ/n)³ and quality factors up to 107. Using FEM simulations on the same structures we find localized mechanical modes with resonance frequencies in the range of few 10 GHz and quality factors up to 107. From the results of the simulations we can calculate optomechanical coupling constants g0 in the order of 106 Hz. This combination of parameters would allow for experiments in the resolved sideband regime.