Fabrication of optical photonic crystals by holographic lithography

As a method of combining holography and photoinduced polymerization techniques, holographic lithography (HL) has been extensively applied in fabricating mesoscale structures such as photonic crystals recently because of the advantages of flexibility, convenience and high efficiency over some other conventional techniques. In this contribution, we demonstrate the fabrication of visible photonic band gap structures using SU8 resin or dichromate gelatin (DCG) holographic materials. The optical spectrum shows that the structures exhibit colorful photonic band-gap characteristics in the whole visible range. Due to the sharp photonic band gap in optical spectrum, the optical structures will shed light to study photon localization phenomenon and the spontaneous emission of dye atoms in these kinds of optical photonic crystals.