An analysis of superprism effect in low index contrast polymer photonic crystal is presented. It shows extremely sensitivity to the wavelength and angle of the incident light due to the strong anisotropy of photonic band structures. Two-dimensional (2-D) polymer photonic crystals with triangular lattice structure were fabricated by soft lithography using elastomeric polydimethylsiloxane (PDMS) templates. Dense two dimensional photonic crystal superprism structures with feature sizes of 150-500nm and aspect ratios of up to 1.25 were successfully replicated by soft lithography. Large field size and easy fabrication are two major advantages when compared with other imprint technology. Atomic Force Microscopy images showed that the molded structures had high fidelity to the masters. Such an effective, low cost, and high throughput soft lithography technique could find wide use in making photonic crystal based nanostructures.
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