摘要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.
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.
[1]Victor S Y et al 1997 Science 278 31 [2] Gao J, Gao T and Michael J S 2000 Appl. Phys. Lett. 77 67 [3] Matthew P D, Zhang Z, Mira S et al 2000 Anal. Chem. 72 13 [4] Yang X Y, Liu D M, Xie W C et al 2007 Chin. Phys.Lett. 24 2 [5] Tushar P, Daniel M M and Vicki L C 2006 Opt. Mater. 29 56 [6] Hamza K and Citrin D S 2005 Appl. Phys. Lett. 87 041108 [7] Topol'ancik J, Bhattacharya P, Sabarinathan J et al 2003 Appl. Phys. Lett. 82 8 [8] Richard M, Ahmed S, John H et al 2006 Proc. SPIE 6322 63220I [9] Mindy L and Philippe M F 2006 Proc. SPIE 632263220B [10] Loncar M, Yoshie T, Okamoto K et al 2004 IEICETrans. Electron. E87-C 3 [11] Qiu M et al 2002 Appl. Phys. Lett. 81 7 [12] Kin S C 1996 IEEE Trans. Microwave Theor. Tech. 44 5