Abstract

We experimentally demonstrate a new class of optical waveguide consisting of $a‐\mathrm{Si}/{\mathrm{SiO}}_2$ autocloned photonic crystals with modulated lattice structure. The waveguide utilizes the macroscopic form birefringence of photonic crystals and confines light by the difference in the effective refractive index. A monopole modal field with spot diameters of $6.9 \mathit{\mu }\mathrm{m}\times 6.5 \mathit{\mu }\mathrm{m}$ was observed at a wavelength of $1.55 \mathit{\mu }\mathrm{m}$. The propagation loss of the waveguide at the wavelength was found to be $\sim 4.2 \mathrm{dB}/\mathrm{mm}$ at most.

© 2002 Optical Society of America

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