| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Emissions of Photonic Crystal Waveguides with Discretely Modulated Surfaces |
| TANG Dong-Hua, CHEN Li-Xue, LIU Yan, SUN Xiu-Dong, DING Wei-Qiang |
| Department of Physics, Harbin Institute of Technology, Harbin 150001 |
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| Cite this article: |
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TANG Dong-Hua, CHEN Li-Xue, LIU Yan et al 2009 Chin. Phys. Lett. 26 054214 |
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Abstract Transmission properties of photonic crystal (PC) waveguides with discretely modulated exit surfaces are investigated numerically using the finite-difference time-domain (FDTD) method. Unlike the case of periodically modulated surfaces, where the transmission beam tends to be a single and directional beam, when the exit surfaces are modulated only at several discrete points, the emission power tends to split into multiple and directional beams. We explain this phenomenon using a multiple point source interference model. Based on these results, we propose a 1-to-Nbeam splitter, and numerically realized high efficiency coupling between a PC sub-wavelength waveguide and three traditional dielectric waveguides with a total efficiency larger than 92%. This simple, easy fabrication, and controllable mechanism may find more potential applications in integrated optical circuits.
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| Keywords:
42.70.Qs
42.79.Fm
42.82.Et
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Received: 24 November 2008
Published: 23 April 2009
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| PACS: |
42.70.Qs
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(Photonic bandgap materials)
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42.79.Fm
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(Reflectors, beam splitters, and deflectors)
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42.82.Et
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(Waveguides, couplers, and arrays)
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