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Gap maps for a dielectric contrast of 13:1. The insets show the contents of a unit cell. (a) The simple cubic P structure. (b) Three-term “diamond-like” structure (fcc translational symmetry). (c) Three term gyroid-like structure (bcc translational symmetry). In the case of the non-cubic structures additional directions in the Brillouin zone were considered.
SEM of the three-term diamond-like structure caused by the exposure of the four beam interference pattern in SU-8. Refraction is compensated for by using the prism configuration shown in the inset. Three views are shown: (a) off the threefold axis, (b) along the twofold axis, (c) cleaved sample showing the 3D nature of the structure across the thickness of the sample.
(a) SEM micrograph of the (100) surface for a P surface structure having a periodicity of . The inset shows a SEM image of a P surface structure having a periodicity of demonstrating size scalability. The inset diffraction pattern is from another P surface structure showing the (111) orientation. The scale bars shown are . (b) Two possible six-beam configurations for the fabrication of the P structure. The polarizations are indicated as small arrows on the beams.
Beam parameters for the four beam setup of the three term simple cubic P surface, diamond-like and gyroid-like structures.
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