Spectroscopic sensing enhanced by quantum molecular coherence and by plasmonic nanoantennas

Mariia Shutova; Anton D. Shutov; Alexei V. Sokolov

doi:10.1117/12.2552553

25 February 2020 Spectroscopic sensing enhanced by quantum molecular coherence and by plasmonic nanoantennas

Mariia Shutova, Anton D. Shutov, Alexei V. Sokolov

Author Affiliations +

Proceedings Volume 11296, Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology II; 1129605 (2020) https://doi.org/10.1117/12.2552553
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

Raman scattering is a powerful instrument for spectroscopic sensing, which offers superb selectivity but typically at the expense of low signal and long collection times. In this paper we discuss mechanisms for signal enhancement that dramatically improve the performance of Raman spectroscopic systems. Several approaches, as well as their combinations are considered. One approach is to produce Raman coherence; other approaches exploit the advantages of nanosized antenna-like structures, or employ wavefront shaping of the applied laser beams. Combining these techniques in one system leads to multiplicative signal enhancement and results in an unprecedented sensitivity. In a sequence of steps toward this goal, we show that the automated feedback-based wavefront shaping algorithm is capable of improving coherent cascaded Raman scattering in crystals. In addition, we utilize the fact that specially designed nanoantennas, placed in the vicinity of the target molecule, can significantly increase the probability of exciting dipole-forbidden electronic transitions. Nanostructure-enhanced spectroscopy with shaped beams will allow for an increase in spectroscopic sensitivity and efficient detection of magnetic dipole and electric quadrupole transitions induced in molecules. The ultimate goal for developing these techniques is to achieve single-molecule sensitivity in spectroscopy, combined with atomic spatial resolution, study the layout and chemical bonds of the molecular structure and extract information relevant to chirality.

Citation Download Citation

Mariia Shutova, Anton D. Shutov, and Alexei V. Sokolov "Spectroscopic sensing enhanced by quantum molecular coherence and by plasmonic nanoantennas", Proc. SPIE 11296, Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology II, 1129605 (25 February 2020); https://doi.org/10.1117/12.2552553

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE