Wavelength-sized Optomechanical Disk Resonator Embedded in a Sunflower Circular Photonic Crystal

Photonic nanocavities are a key component in many applications because of their capability of trapping and storing photons and enhancing interactions of light with various functional materials and structures. The maximal number of photons that can be stored in silicon photonic cavities is limited by the free-carrier and thermo-optic effects at room temperature. To reduce such effects, we performed the first experimental study of optical nonlinearities in ultrahigh-Q silicon disk nanocavities at cryogenic temperatures in a superfluid helium environment. At elevated input power, the cavity transmission spectra exhibit distinct blue-shifted bistability behavior when temperature crosses the liquid helium lambda point. At even lower temperatures, the spectra restore to symmetric Lorentzian shapes. Under this condition, we obtain a large intracavity photon number of about 40,000, which is limited ultimately by the local helium phase transition. These new discoveries are explained by theoretical calculations and numerical simulations.

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Nonlinear optical effects of ultrahigh-Q silicon photonic nanocavities immersed in superfluid helium

Sun

Zhang

Schuck

et al. 2013

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Wavelength-sized Optomechanical Disk Resonator Embedded in a Sunflower Circular Photonic Crystal

Abstract: We demonstrate a micron-sized ultrahigh-Q (Q o =740,000) disk cavity by embedding it in a sunflower-type circular photonic crystal. The disk's fundamental mechanical radial-contour mode is optically transduced at 2.19 GHz with a displacement sensitivity of 6.4 am/Hz 1/2 .

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Nonlinear optical effects of ultrahigh-Q silicon photonic nanocavities immersed in superfluid helium

Nonlinear optical effects of ultrahigh-Q silicon photonic nanocavities immersed in superfluid helium

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