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Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy

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Published on: May 18, 2011

Microlens Hollow-Core Fiber Probes for Operando Raman Spectroscopy.

Megan J Groom^1,2, Ermanno Miele^1,2, Jonathan Pinnell¹

¹Nanophotonics Centre, Department of Physics, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, U.K.

|August 26, 2024

Summary

This summary is machine-generated.

We developed a compact fiber-optic Raman probe for in situ spectroscopy. This flexible probe enables real-time chemical analysis within devices, like lithium batteries, offering an alternative to traditional microscopes.

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Area of Science:

Materials Science
Spectroscopy
Optics

Background:

In situ spectroscopy is crucial for understanding dynamic processes in devices.
Traditional Raman microscopy setups are often bulky and not suitable for integration into devices.
There is a need for miniaturized spectroscopic probes for operando analysis.

Purpose of the Study:

To introduce a flexible microscale all-fiber-optic Raman probe for embedded, in situ spectroscopy.
To characterize the performance of the developed fiber probe for chemical analysis.
To demonstrate the probe's viability as an alternative to bulk optic Raman microscopes.

Main Methods:

Fabrication of a probe using nested antiresonant nodeless hollow-core fiber and a barium titanate microlens.
Characterization of 785 nm pump laser excitation and near-infrared collection.
Testing the probe's efficacy with surface-enhanced Raman spectroscopy samples and a copper battery electrode.

Main Results:

Achieved an excitation spot with a 1.1 μm full-width-half-maximum.
Demonstrated comparable Raman scattering collection efficiency to a 10x objective.
Validated the probe's capability for operando analysis in lithium battery monitoring.

Conclusions:

The developed fiber-optic Raman probe is a viable tool for operando in situ spectroscopy.
This technology enables real-time chemical analysis within devices, advancing battery research and other applications.
The probe offers a flexible and compact alternative to conventional Raman microscopy.