Optical sensing of square lattice photonic crystal point-shifted nanocavity for protein adsorption detection

Tsan Wen Lu; Pin Tso Lin; Kuan Un Sio; Po Tsung Lee

doi:10.1063/1.3436550

Optical sensing of square lattice photonic crystal point-shifted nanocavity for protein adsorption detection

Tsan Wen Lu^*, Pin Tso Lin, Kuan Un Sio, Po Tsung Lee

^*Corresponding author for this work

Department of Photonics

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

19 Scopus citations

Abstract

We propose a point-shifted D0 nanocavity formed by locally modulating four central air holes in square lattice photonic crystal for optical sensing application. Three defect modes in this nanocavity, including monopole, whispering-gallery, and dipole modes, are identified in experiments. We also apply a chemical treatment on InGaAsP surface to form a 1-octadecanethiol linking monolayer, which enables the following protein adsorption. In experiments, the wavelength shifts of lasing modes in the D0 nanocavity due to the protein adsorption are observed and agree with the simulation results. This can be a practical tool for label-free molecule detection in biomedical researches.

Original language	English
Article number	213702
Journal	Applied Physics Letters
Volume	96
Issue number	21
DOIs	https://doi.org/10.1063/1.3436550
State	Published - 24 May 2010

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abstract = "We propose a point-shifted D0 nanocavity formed by locally modulating four central air holes in square lattice photonic crystal for optical sensing application. Three defect modes in this nanocavity, including monopole, whispering-gallery, and dipole modes, are identified in experiments. We also apply a chemical treatment on InGaAsP surface to form a 1-octadecanethiol linking monolayer, which enables the following protein adsorption. In experiments, the wavelength shifts of lasing modes in the D0 nanocavity due to the protein adsorption are observed and agree with the simulation results. This can be a practical tool for label-free molecule detection in biomedical researches.",

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AU - Lu, Tsan Wen

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AU - Lee, Po Tsung

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AB - We propose a point-shifted D0 nanocavity formed by locally modulating four central air holes in square lattice photonic crystal for optical sensing application. Three defect modes in this nanocavity, including monopole, whispering-gallery, and dipole modes, are identified in experiments. We also apply a chemical treatment on InGaAsP surface to form a 1-octadecanethiol linking monolayer, which enables the following protein adsorption. In experiments, the wavelength shifts of lasing modes in the D0 nanocavity due to the protein adsorption are observed and agree with the simulation results. This can be a practical tool for label-free molecule detection in biomedical researches.

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Optical sensing of square lattice photonic crystal point-shifted nanocavity for protein adsorption detection

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