| 초록 |
Photonic crystals which have periodic refractive index contrast exhibit a property of photonic bandgap. Photons in a bandgap cannot propagate through materials, thereby showing iridescent reflection color. Multi-colored photonic crystals are appealing for display device, anti-counterfeiting and sensors. However, there is no practical method to create such color patterns with high reflectivity and resolution. In this study, we report a pragmatic strategy to create multi-color photonic micropatterns by localized anisotropic compression of inverse opals made of photoresist. The inverse opals are shrunken above glass transition temperature (Tg) to minimize surface energy. Because Tg of photoresist can be controlled by crosslinking density through UV irradiation, the degree of compression can be locally controlled by UV irradiation through photomask. This multi-color patterns exhibit high reflectivity due to high void fraction and resolution limit can be reduced down to a few micrometers. |
