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A Photonic-Crystal Optical Antenna for Extremely Large Local-Field Enhancement

Research Area: Nanophotonics Year: 2010
Type of Publication: Article Keywords: photonic crystal, nonlinear optics, Raman spectroscopy, Purcell factor
Authors: Chang, H. -J.; Kim, Se-Heon; Lee, Y. -H.; Kartalov, Emil; Scherer, Axel
Journal: Optics Express Volume: 18
Number: 23 Pages: 24163
Month: November
We propose a novel design of an all-dielectric optical antenna based on photonic-band-gap confinement. Specifically, we have engineered the photonic-crystal dipole mode to have broad spectral response (Q similar to 70) and well-directed vertical-radiation by introducing a plane mirror below the cavity. Considerably large local electric-field intensity enhancement similar to 4,500 is expected from the proposed design for a normally incident planewave. Furthermore, an analytic model developed based on coupled-mode theory predicts that the electric-field intensity enhancement can easily be over 100,000 by employing reasonably high-Q (similar to 10,000) resonators.
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