| Original Articles |
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An Integrative Biosensor Based on Contra-Directional Coupling Two-dimensional Photonic Crystal Waveguides |
MAO Xiao-Yu;YAO Di-Bi;ZHAO Ling-Yun;HUANG Yi-Dong;ZHANG Wei;PENG Jiang-De |
| State Key Lab of Integrated Optoelectronics, Department of Electronics Engineering, Tsinghua University, Beijing 100084 |
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| Cite this article: |
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MAO Xiao-Yu, YAO Di-Bi, ZHAO Ling-Yun et al 2008 Chin. Phys. Lett. 25 141-143 |
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Abstract We propose an integrative biochemical sensor utilizing the dip in the transmission spectrum of a normal single-line defect photonic crystal (PC) waveguide, which has a contra-directional coupling with another PC waveguide. When the air holes in the PC slab are filled with a liquid analyte with different refractive indices, the dip has a wavelength shift. By detecting the output power variation at a certain fixed wavelength, a sensitivity of 1.2×10-4 is feasible. This structure is easy for integration due to its plane waveguide structure and omissible pump source. In addition, high signal to noise ratio can be expected because signal transmits via a normal single-line defect PC waveguide instead of the PC hole area or analyte.
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| Keywords:
42.70.Qs
78.20.Bh
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Received: 30 May 2007
Published: 27 December 2007
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| PACS: |
42.70.Qs
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(Photonic bandgap materials)
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78.20.Bh
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(Theory, models, and numerical simulation)
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