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Please use this identifier to cite or link to this item: http://hdl.handle.net/1783.1/6638
Title: Lasing from dye-doped icosahedral quasicrystals in dichromate gelatin emulsions
Authors: Kok, Mang Hin
Lu, Weixin
Tam, Wing Yim
Wong, George K. L.
Keywords: Nanophotonics and photonic crystals
Microstructure fabrication
Holography
Issue Date: 27-Apr-2009
Citation: Optics express, v. 17, no. 9, p. 7275-7284
Abstract: Lasing requires an active gain medium and a feedback mechanism. In conventional lasers the feedback is provided externally, e.g. by mirrors. An alternate approach is through Bloch waves in photonic crystals composed of periodic dielectric materials in which propagation of light in certain frequency ranges, known as photonic bandgaps, is forbidden. Compared to periodic crystals, quasicrystals have higher symmetry and are more favorable for the formation of photonic bandgaps. Hence quasicrystals are more efficient in providing the feedback mechanism for lasing. Here we report observation of lasing at visible wavelengths from dye-doped three-dimensional icosahedral quasicrystals fabricated in dichromate gelatin emulsions using a novel seven-beam optical interference holographic method. Multi-directional lasing exhibiting the icosahedral symmetry was observed. The lasing modes and pattern were explained by using the lasing condition expressed in the reciprocal lattice space of the icosahedral quasicrystal.
Rights: We would like to give credit to the Optical Society of America for granting us permission to repost this Optics Express article. The original article is posted on the journal's web site at http://www.opticsexpress.org
URI: http://hdl.handle.net/1783.1/6638
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