Frequency control of photonic crystal membrane resonators by mono-layer deposition

Physics – Condensed Matter – Materials Science

Scientific paper

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3 pages, 4 figures, submitted to Appl. Phys. Lett

Scientific paper

10.1063/1.2164922

We study the response of GaAs photonic crystal membrane resonators to thin film deposition. Slow spectral shifts of the cavity mode of several nanometers are observed at low temperatures, caused by cryo-gettering of background molecules. Heating the membrane resets the drift and shielding will prevent drift altogether. In order to explore the drift as a tool to detect surface layers, or to intentionally shift the cavity resonance frequency, we studied the effect of self-assembled monolayers of polypeptide molecules attached to the membranes. The 2 nm thick monolayers lead to a discrete step in the resonance frequency and partially passivate the surface.

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