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Detection and sensing of molecules via their interaction with light opens opportunities for studies ranging from nanoscale single-molecule readout to long-range experiments. Plasmonic antennas allow localized electromagnetic enhancement, allowing Raman-spectroscopic sensing with sub-nanometer spatial resolution. Further signal enhancement can be obtained through the use of molecular coherence - produced either through coherent Raman excitation or via direct infrared driving. The next level of improvements in signal-to-noise ratio will come with the use of properly engineered non-classical states of light.
Alexei V. Sokolov,Nathan Marshall,Jizhou Wang, andZhenhuan Yi
"Quantum-spectroscopic tools for nano-bio-photonics", Proc. SPIE PC12447, Quantum Sensing, Imaging, and Precision Metrology, PC124473A (9 March 2023); https://doi.org/10.1117/12.2657179
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