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Article Dans Une Revue Physical Review Applied Année : 2023

Selective Detection in Impulsive Low-Frequency Raman Imaging Using Shaped Probe Pulses

Résumé

Impulsive stimulated Raman scattering (ISRS) using a single short femtosecond pump pulse to excite molecular vibrations offers an elegant pump-probe approach to perform vibrational imaging below 200cm−1. One shortcoming of ISRS is its inability to offer vibrational selectivity as all the vibrational bonds whose frequencies lie within the short pump-pulse bandwidth are excited. To date, several coherent control techniques have been explored to address this issue and selectively excite a specific molecular vibration by shaping the pump pulse. There has not been any systematic work that reports an analogous shaping of the probe pulse to implement preferential detection. In this work, we focus on vibrational imaging and report vibrational selective detection by shaping the probe pulse in time. We demonstrate numerically and experimentally two pulse-shaping strategies with one functioning as a vibrational notch filter and the other functioning as a vibrational low-pass filter. This enables fast (25μs/pixel) and selective hyperspectral imaging in the low-frequency regime (<200cm−1).
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Dates et versions

hal-04104243 , version 1 (23-05-2023)

Identifiants

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Siddarth Shivkumar, Dekel Ranann, Samuel Metais, Sisira Suresh, Nicolas Forget, et al.. Selective Detection in Impulsive Low-Frequency Raman Imaging Using Shaped Probe Pulses. Physical Review Applied, 2023, 19 (5), pp.054075. ⟨10.1103/PhysRevApplied.19.054075⟩. ⟨hal-04104243⟩
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