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Attaching Biological Probes to Silica Optical Biosensors Using Silane Coupling Agents
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Two-Dimensional Hole-Array Grating-Coupling-Based Excitation of Bloch Surface Waves for Highly Sensitive Biosensing.

Daohan Ge1,2,3, Jianpei Shi4,5, Ahmed Rezk4

  • 1School of Mechanical Engineering, Jiangsu University, Zhenjiang, 212013, People's Republic of China. gedaohan@mail.ujs.edu.cn.

Nanoscale Research Letters
|October 11, 2019
PubMed
Summary

This study introduces a novel biosensing platform using a 2D grating on distributed Bragg reflectors to excite Bloch surface waves (BSW). This configuration significantly enhances angular sensitivity for refractive index sensing applications.

Keywords:
2D gratingBloch surface waveRefractive index sensorsSensitivity

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Area of Science:

  • Nanophotonics
  • Biosensing
  • Surface Physics

Background:

  • Distributed Bragg reflectors (DBRs) are crucial for optical devices.
  • Bloch surface waves (BSWs) offer enhanced light-matter interaction.
  • Existing biosensing methods face limitations in sensitivity and compactness.

Purpose of the Study:

  • To investigate a novel biosensing scheme utilizing a 2D grating on DBRs.
  • To explore the excitation of Bloch surface waves (BSWs) via grating coupling.
  • To evaluate the angular sensitivity and figure of merit for refractive index sensing.

Main Methods:

  • Fabrication of a 2D subwavelength hole-array grating on DBRs.
  • Excitation of BSW resonance using grating coupling (DG-BSW and GC-BSW configurations).
  • Measurement of material losses and angular sensitivity.

Main Results:

  • Achieved BSW resonance at different locations on the DBR structure.
  • Demonstrated significantly enhanced angular sensitivity compared to prism-coupled methods.
  • Reported maximum sensitivities of 1190°/RIU (DG-BSW) and 2255°/RIU (GC-BSW).

Conclusions:

  • The proposed grating-coupled BSW configurations offer a robust and highly sensitive platform for biosensing.
  • Compact refractive index sensors with a high figure of merit are achievable.
  • This approach advances nanophotonic biosensing capabilities.