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Frequency control of photonic crystal membrane resonators by monolayer deposition

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11 Author(s)
Strauf, S. ; University of California, Santa Barbara, Santa Barbara, California 93106 ; Rakher, M.T. ; Carmeli, I. ; Hennessy, K.
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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.

Published in:

Applied Physics Letters  (Volume:88 ,  Issue: 4 )

Date of Publication:

Jan 2006

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