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Updated: Feb 11, 2026
07:28
Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
Published on: August 30, 2012
11.2K
Adjustable microscopic measurement of nanogap waveguide and plasmonic structures
Applied Optics
|May 5, 2018
Summary
We explored surface plasmon and Fabry-Perot modes in closely spaced layers. The Fabry-Perot modes show over ten times better refractive index sensing than the Kretschmann configuration.
Area of Science:
- Optics and Photonics
- Nanotechnology
- Materials Science
Background:
- Surface plasmon resonance (SPR) and Fabry-Perot (FP) interferometry are optical sensing techniques.
- The Kretschmann configuration is a common method for exciting surface plasmons.
- Investigating modes at varying layer separations is crucial for developing novel sensors.
Purpose of the Study:
- To explore surface plasmon and Fabry-Perot modes in dual-layer structures.
- To identify modes excitable at lower incident angles with high refractive index responsivity.
- To develop a versatile method for studying such structures across various separations.
Main Methods:
- Utilized back focal plane observation for mode analysis.
- Employed signal processing techniques for data interpretation.
- Investigated both Otto and hybrid Kretschmann-Otto configurations.
Main Results:
- Demonstrated Otto configuration performance at visible wavelengths for unreported separations.
- Introduced the Kretschmann-Otto configuration with continuously tunable modes.
- Showcased Fabry-Perot modes with over an order of magnitude superior refractive index responsivity compared to the Kretschmann configuration.
Conclusions:
- The study presents a novel approach to excite and analyze optical modes in layered structures.
- The developed hybrid configuration offers tunable optical responses.
- Fabry-Perot modes in this configuration exhibit significantly enhanced refractive index sensing capabilities.
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