Chemical sensing in slotted photonic crystal heterostructure cavities

Andrea Di Falco; Liam O'Faolain; Thomas Fraser Krauss

doi:10.1063/1.3079671

Chemical sensing in slotted photonic crystal heterostructure cavities

Andrea Di Falco, Liam O'Faolain, Thomas Fraser Krauss

Research output: Contribution to journal › Article › peer-review

Abstract

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=Delta lambda/Delta n 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.

Original language	English
Article number	063503
Number of pages	3
Journal	Applied Physics Letters
Volume	94
Issue number	6
DOIs	https://doi.org/10.1063/1.3079671
Publication status	Published - 9 Feb 2009

Keywords

chemical sensors
photonic crystals
refractive index
voids (solid)
BIOCHEMICAL SENSOR
MICROCAVITY

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10.1063/1.3079671

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title = "Chemical sensing in slotted photonic crystal heterostructure cavities",

abstract = "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=Delta lambda/Delta n 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.",

keywords = "chemical sensors, photonic crystals, refractive index, voids (solid), BIOCHEMICAL SENSOR, MICROCAVITY",

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AU - Di Falco, Andrea

AU - O'Faolain, Liam

AU - Krauss, Thomas Fraser

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Y1 - 2009/2/9

N2 - 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=Delta lambda/Delta n 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.

AB - 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=Delta lambda/Delta n 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.

KW - chemical sensors

KW - photonic crystals

KW - refractive index

KW - voids (solid)

KW - BIOCHEMICAL SENSOR

KW - MICROCAVITY

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UR - http://www.st-andrews.ac.uk/~photocryst/Assets/Publications/ChemSensing.pdf

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VL - 94

JO - Applied Physics Letters

JF - Applied Physics Letters

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M1 - 063503

ER -

Chemical sensing in slotted photonic crystal heterostructure cavities

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