The development of high-resolution Fabry-Pérot interferometers has enabled a wide range of scientific and technological advances—ranging from the characterization of material properties to the more fundamental studies of quasi particles in condensed matter. Spectral contrast is key to measuring weak signals and can reach a 103 peak-to-background ratio in a single-pass assembly.At its heart, this limit is a consequence of an unbalanced field amplitude across multiple interfering paths, with an ensuing reduced fringe visibility. Using a high-resolution, high-throughput virtually imaged phased array spectrometer, we demonstrate an intensity-equalization method to achieve an unprecedented 1000-fold increase in spectral contrast in a single-stage, single-pass configuration. To validate the system, we obtain the Brillouin spectrum of water at high scattering concentrations where, unlike with the standard scheme, the inelastic peaks are highly resolved. Our method brings the interferometer close to its ultimate limits and allows rapid high-resolution spectral analysis in a wide range of fields, including Brillouin spectroscopy, mechanical imaging, and molecular fingerprinting.

Breaking the Contrast Limit in Single-Pass Fabry-Pérot Spectrometers / Antonacci, G.; De Panfilis, S.; DI DOMENICO, Giuseppe; DEL RE, Eugenio; Ruocco, Giancarlo. - In: PHYSICAL REVIEW APPLIED. - ISSN 2331-7019. - ELETTRONICO. - 6:5(2016), pp. 054020-1-054020-5. [10.1103/PhysRevApplied.6.054020]

Breaking the Contrast Limit in Single-Pass Fabry-Pérot Spectrometers

DI DOMENICO, GIUSEPPE;DEL RE, EUGENIO;RUOCCO, Giancarlo
2016

Abstract

The development of high-resolution Fabry-Pérot interferometers has enabled a wide range of scientific and technological advances—ranging from the characterization of material properties to the more fundamental studies of quasi particles in condensed matter. Spectral contrast is key to measuring weak signals and can reach a 103 peak-to-background ratio in a single-pass assembly.At its heart, this limit is a consequence of an unbalanced field amplitude across multiple interfering paths, with an ensuing reduced fringe visibility. Using a high-resolution, high-throughput virtually imaged phased array spectrometer, we demonstrate an intensity-equalization method to achieve an unprecedented 1000-fold increase in spectral contrast in a single-stage, single-pass configuration. To validate the system, we obtain the Brillouin spectrum of water at high scattering concentrations where, unlike with the standard scheme, the inelastic peaks are highly resolved. Our method brings the interferometer close to its ultimate limits and allows rapid high-resolution spectral analysis in a wide range of fields, including Brillouin spectroscopy, mechanical imaging, and molecular fingerprinting.
2016
Brillouin spectroscopy; imaging
01 Pubblicazione su rivista::01a Articolo in rivista
Breaking the Contrast Limit in Single-Pass Fabry-Pérot Spectrometers / Antonacci, G.; De Panfilis, S.; DI DOMENICO, Giuseppe; DEL RE, Eugenio; Ruocco, Giancarlo. - In: PHYSICAL REVIEW APPLIED. - ISSN 2331-7019. - ELETTRONICO. - 6:5(2016), pp. 054020-1-054020-5. [10.1103/PhysRevApplied.6.054020]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/930565
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