Chemical sensing in slotted photonic crystal heterostructure cavities

Applied Physics Letters - Tập 94 Số 6 - 2009
Andrea Di Falco1, Liam O’Faoláin1, Thomas F. Krauss1
1University of St. Andrews School of Physics and Astronomy, , North Haugh, St. Andrews, FIFE, KY16 9SS, United Kingdom

Tóm tắt

We fabricated slotted photonic crystal waveguides and cavities supporting resonant modes in air. Their peculiar geometry enables the detection of refractive index changes in a given analyte with high sensitivity because of the large overlap between the optical mode and the analyte. This yields a high figure of merit for the sensitivity of the device and we are able to report values of S=Δλ/Δn over 1500. By applying a photonic crystal heterostructure to the slotted geometry, we are able to create high quality-factor cavities essential for realizing low detection limits up to Q=50 000.

Từ khóa


Tài liệu tham khảo

2004, Opt. Lett., 29, 1209, 10.1364/OL.29.001209

2007, Opt. Lett., 32, 3080, 10.1364/OL.32.003080

2008, Photonics Nanostruct. Fundam. Appl., 6, 38, 10.1016/j.photonics.2007.08.001

2008, Appl. Phys. Lett., 92, 083501, 10.1063/1.2885072

2007, Opt. Lett., 32, 3284, 10.1364/OL.32.003284

2007, Opt. Express, 16, 11709, 10.1364/OE.16.011709

2003, Nature (London), 425, 944, 10.1038/nature02063

2003, Appl. Phys. Lett., 82, 4648, 10.1063/1.1586781

2006, Interfacial Forces in Aqueous Media

2004, Opt. Lett., 29, 1093, 10.1364/OL.29.001093

2007, Opt. Express, 15, 3169, 10.1364/OE.15.003169

2008, Opt. Lett., 33, 1623, 10.1364/OL.33.001623

2008, Opt. Express, 16, 1020, 10.1364/OE.16.001020

Thông tin
Thông tin xuất bản

Applied Physics Letters

Tập 94 Số 6

Thông tin tác giả