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Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators

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Broadband absorbance in a liquid-core optical ring resonator.

Thomas C Oates¹, Lloyd W Burgess

¹Department of Chemistry, University of Washington, Seattle, Washington 98125-1700, USA. oatest@u.washington.edu

Applied Spectroscopy

|October 12, 2011

Summary

We developed a broadband liquid-core optical ring resonator (BLCORR) for enhanced spectroscopy. This device enables sensitive surface absorbance measurements, outperforming traditional cuvettes for concentrated samples.

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Area of Science:

Optical Spectroscopy
Chemical Sensing
Materials Science

Background:

Traditional spectroscopy methods often have limitations in sensitivity and sample volume.
Optical ring resonators offer enhanced light-matter interaction for spectroscopic analysis.

Purpose of the Study:

To demonstrate a broadband liquid-core optical ring resonator (BLCORR) for enhanced absorption spectroscopy.
To investigate the device's capability for surface-sensitive measurements and analysis of concentrated chromophores.

Main Methods:

Constructed a BLCORR using a fused silica capillary and tapered optical fibers.
Employed a light-emitting diode (LED) as the light source.
Compared BLCORR performance with standard cuvette measurements using methylene blue (MB) and bromothymol blue (BTB) dyes.

Main Results:

Achieved an apparent path length of 5 cm for MB, significantly higher than BTB, indicating surface sensitivity.
Demonstrated the ability to distinguish high concentrations (10^-2 M and 10^-3 M) of BTB, surpassing cuvette performance.
Confirmed that the sensing region is primarily within the evanescent field at the capillary's inner surface.

Conclusions:

The BLCORR enables enhanced surface absorbance measurements in capillaries.
The device shows potential for analyzing highly concentrated chromophores and integrating into microfluidic systems.
BLCORR offers a sensitive and versatile platform for various spectroscopic applications.