J. Semicond. > 2011, Volume 32 > Issue 3 > 034008

SEMICONDUCTOR DEVICES

Design of a photonic crystal microcavity for biosensing

Li Junhua, Kan Qiang, Wang Chunxia, Su Baoqing, Xie Yiyang and Chen Hongda

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DOI: 10.1088/1674-4926/32/3/034008

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Abstract: We have designed an air-bridged PhC microcavity with high sensitivity and a high quality factor. The structure parameters of the microcavity are optimized by three-dimensional finite-difference time-domain method. We compare the performance of a silicon-on-insulator PhC microcavity and an air-bridged PhC microcavity, and analyze the effect of the thickness of the slab and the radius of the defect hole on the performance of the air-bridged PhC microcavity. For a thinner slab and a larger defect hole, the sensitivity is higher while the quality factor is lower. For the air-bridged photonic crystal slab, the sensitivity can reach 320-nm/RIU (refractive index unit) while the quality factor keeps a relatively high value of 120 by selecting the proper slab thickness and the defect hole radius, respectively, when the refractive index is 1.33. This is meaningful for low-detection-limit biosensing.

Key words: air-bridged PhC microcavity

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    Received: 18 August 2015 Revised: 12 October 2010 Online: Published: 01 March 2011

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      Li Junhua, Kan Qiang, Wang Chunxia, Su Baoqing, Xie Yiyang, Chen Hongda. Design of a photonic crystal microcavity for biosensing[J]. Journal of Semiconductors, 2011, 32(3): 034008. doi: 10.1088/1674-4926/32/3/034008 ****Li J H, Kan Q, Wang C X, Su B Q, Xie Y Y, Chen H D. Design of a photonic crystal microcavity for biosensing[J]. J. Semicond., 2011, 32(3): 034008. doi: 10.1088/1674-4926/32/3/034008.
      Citation:
      Li Junhua, Kan Qiang, Wang Chunxia, Su Baoqing, Xie Yiyang, Chen Hongda. Design of a photonic crystal microcavity for biosensing[J]. Journal of Semiconductors, 2011, 32(3): 034008. doi: 10.1088/1674-4926/32/3/034008 ****
      Li J H, Kan Q, Wang C X, Su B Q, Xie Y Y, Chen H D. Design of a photonic crystal microcavity for biosensing[J]. J. Semicond., 2011, 32(3): 034008. doi: 10.1088/1674-4926/32/3/034008.

      Design of a photonic crystal microcavity for biosensing

      DOI: 10.1088/1674-4926/32/3/034008
      • Received Date: 2015-08-18
      • Accepted Date: 2010-09-07
      • Revised Date: 2010-10-12
      • Published Date: 2011-02-23

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