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Title of Journal: Appl Phys B

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Abbravation: Applied Physics B

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Springer-Verlag

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DOI

10.1016/0003-9861(55)90182-x

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1432-0649

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Highly collimated emission from a lefthanded phot

Authors: W Y Liang J W Dong G Q Liang H Z Wang
Publish Date: 2009/07/18
Volume: 96, Issue: 4, Pages: 781-
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Abstract

We study the collimated emission characteristics from a dipole source inside a negativeeffectiverefractiveindex photonic crystal with a quasicavity constructed by a concave photonic crystal reflector The emissions along the ±X and −Y directions are forbidden by the quasicavity so that most emissions propagate along the +Y direction Simulation results show that a narrow collimated beam is achieved due to the nearzero negative effective refractive index Moreover the halfpower beam width of such a collimated beam can be reduced to 348° by optimizing the size of the source area Such a compact structure would have potential applications in microoptical devices

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