Semiconductor photonic crystals and devices at optical wavelengths

Locally resonant phononic woodpile: A wide band anomalous underwater acoustic absorbing material

“…To solve this conflict, we notice the pioneer works on the woodpile photonic crystal that can extend the band gap width of photonic crystal. [11][12][13][14] In this paper, we introduced woodpile structure into the LRPC and developed a kind of underwater acoustic absorbing material, called "locally resonant phononic woodpile ͑LRPW͒," which possesses underwater sound absorption property in a wide band of frequencies. The most striking difference between the LRPW and the LRPC is that locally resonant units in the LRPC distribute discretely in the polymer matrix, while those in LRPW have locally resonant woodpile structure stacked in sequence by LRPC units.…”

“…The woodpile photonic crystal usually consists of layers of onedimensional rods with a stacking sequence that repeats itself every four layers. [11][12][13][14] Two-dimensional LRPC was produced by periodically embedding the metallic rods coated with soft polymer layer into hard polymer matrix. 15 Mimicking woodpile and LRPC structures, we coated a thin layer of soft polymer on woodpile skeleton and then filled the remaining space with hard polymer to make the LRPW.…”

Semicrystalline woodpile photonic crystals without complicated alignment via soft lithography

“…There are reports of a number of fabrication methods for the woodpile PCs ͑Refs. 12-17͒ which attempt to overcome the high cost of conventional photolithographic fabrication, 17,18 however, they are still more costly and time consuming than the inverse opal methods mainly because of complicated interlayer alignment. Recently, we have proposed the possibility that a semicrystalline woodpile PCs, in which no a large size of crystallite exists, would function as a perfect PC.…”

Three-dimensional metallic photonic crystals fabricated by soft lithography for midinfrared applications

“…As PBGs approach the optical range, semiconductor processing has emerged as a reliable means of achieving large-area structures with superior fidelity and intentional defects. 4,5 However, achieving PBG effects requires that the thickness be increased significantly, which is both costly and tedious using semiconductor processing techniques. On the other hand, one interesting alternative, direct laser writing using two-photon polymerization, seems to have the capability of fabricating highly layered structure even with nonperiodic functional defects.…”