发明名称 |
OPTICAL DEVICE WITH TWO DIMENSIONAL PHOTONIC BAND GAP |
摘要 |
In order to create an optical device with a photonic band gap extending in two dimensions and with very uniform properties in any direction and for any polarisation state, to within 1 %, air holes are etched within a substrate of low refractive index material such silicon oxynitride or silica glass. The ratio of air hole area to the remainder of the substrate is low, being less than 35 %. The air holes define a quasicrystal structure, having twelve fold symmetry, being based on a square-triangle system. In another development, an etched substrate with a regular crystal structure or quasicrystal structure exhibits a non-linear refractive index. Two adjacent areas in such a substrate have different lattice properties, or have defects in the lattices, to create a unidirectional transmission path (diode action). A further beam of light may be used to modulate the transmission path by reason of the non-linear refractive index. |
申请公布号 |
CA2404743(C) |
申请公布日期 |
2011.10.25 |
申请号 |
CA20012404743 |
申请日期 |
2001.04.06 |
申请人 |
BTG INTERNATIONAL LIMITED |
发明人 |
BAUMBERG, JEREMY JOHN;CHARLTON, MARTIN DAVID BRIAN;NETTI, MARIA CATERINA;PARKER, GREGORY JASON;ZOOROB, MAJD ELIAS |
分类号 |
G02B6/12;C30B29/60;C30B33/00;G02B1/02;G02B6/122;G02F1/31;G02F1/35 |
主分类号 |
G02B6/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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