| 초록 |
General photonic crystals are made up materials that have different real part of refractive index and until now, imaginary part of refractive index in photonic crystals is not considered. However, absorption can also open the photonic bandgap and affect to photonic properties. So, we investigated how resonance between absorbance and reflectance affects to photonic property of photonic crystals. We use polydopamine (PDA) nanoparticles as absorbing material. When PDA put into SiO2 quasi-amorphous photonic solution (QAPS), PDA/SiO2 QAPS shows high contrast photonic color and enhanced reflectance. Also, when dye trapped polystyrene (PS) nanoparticles are added in QAPS, novel phenomena occurred. Only when photonic bandgap region matched with absorbance band of dye, reflectance of QAPS enhanced. Otherwise reflectance intensity not changed. This result show interplay between absorption and reflectance and considerably encourage in field of optics using photonic crystals. |
