We present experimental and finite-difference time-domain simulation results on the tunability of optical resonant modes of spiral microtube cavities, rolled-up from square patterned $\mathrm{Si}\mathrm{O}∕\mathrm{Si}{\mathrm{O}}_2$ thin nanomembranes on glass substrates. The peak positions of resonant TM modes shift to lower energies by coating the microtube wall with ${\mathrm{Al}}_2{\mathrm{O}}_3$ monolayers, which is well described by simulations. Moreover, a second group of tunable resonant modes appears beyond a certain critical thickness of the coated ${\mathrm{Al}}_2{\mathrm{O}}_3$ . The polarization of this group of modes is TE, as we find out by a detailed analysis of the polarization-dependent photoluminescence spectra.

© 2009 Optical Society of America

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