We present the full diagrammatic description of non-resonant impulsive femtosecond stimulated Raman spectroscopy in a multimode model system. In this technique the pump-probe scheme is exploited to study the vibrational structure of the sample via stimulated Raman scattering. We apply closed-time-path-loop diagrams to calculate the complete response of the system at the relevant perturbation order. We show that, in presence of low-frequency modes, coherences created by the impulsive pump modify the resulting Raman signal, which oscillates from gain to loss features, depending on the time delay between the pump and probe pulses. This leads to a redistribution of photons among the fields involved in the process and, consequently, the energy flows between fields and matter. Moreover, through this formalism, we address the case of extremely short delays in which the pump and probe fields overlap in time. We find that, even in absence of photo-induced dynamics due to absorption of the pump pulse, the overlap condition can generate time dependent features, arising from additional diagrams, which oer no contribution for well separated pulses.

Probing ultrafast processes by fifth order Stimulated Raman Scattering / Fumero, Giuseppe; Batignani, Giovanni; Dorfman, Konstantin E.; Mukamel, Shaul; Scopigno, Tullio. - In: JOURNAL OF PHYSICS. CONFERENCE SERIES. - ISSN 1742-6588. - ELETTRONICO. - 689:(2016), pp. 012023 1-012023 6. ((Intervento presentato al convegno 6th Young Researcher Meeting tenutosi a L’Aquila, Italia nel October 12th-14th 2015 [10.1088/1742-6596/689/1/012023].

Probing ultrafast processes by fifth order Stimulated Raman Scattering

Fumero, Giuseppe;BATIGNANI, GIOVANNI;SCOPIGNO, TULLIO
2016

Abstract

We present the full diagrammatic description of non-resonant impulsive femtosecond stimulated Raman spectroscopy in a multimode model system. In this technique the pump-probe scheme is exploited to study the vibrational structure of the sample via stimulated Raman scattering. We apply closed-time-path-loop diagrams to calculate the complete response of the system at the relevant perturbation order. We show that, in presence of low-frequency modes, coherences created by the impulsive pump modify the resulting Raman signal, which oscillates from gain to loss features, depending on the time delay between the pump and probe pulses. This leads to a redistribution of photons among the fields involved in the process and, consequently, the energy flows between fields and matter. Moreover, through this formalism, we address the case of extremely short delays in which the pump and probe fields overlap in time. We find that, even in absence of photo-induced dynamics due to absorption of the pump pulse, the overlap condition can generate time dependent features, arising from additional diagrams, which oer no contribution for well separated pulses.
6th Young Researcher Meeting
Coherent Raman Spectroscopy; Time Resolved Raman Spectroscopy; Raman signal
04 Pubblicazione in atti di convegno::04c Atto di convegno in rivista
Probing ultrafast processes by fifth order Stimulated Raman Scattering / Fumero, Giuseppe; Batignani, Giovanni; Dorfman, Konstantin E.; Mukamel, Shaul; Scopigno, Tullio. - In: JOURNAL OF PHYSICS. CONFERENCE SERIES. - ISSN 1742-6588. - ELETTRONICO. - 689:(2016), pp. 012023 1-012023 6. ((Intervento presentato al convegno 6th Young Researcher Meeting tenutosi a L’Aquila, Italia nel October 12th-14th 2015 [10.1088/1742-6596/689/1/012023].
File allegati a questo prodotto
File Dimensione Formato  
Fumero_Raman-scattering.pdf

accesso aperto

Tipologia: Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza: Creative commons
Dimensione 3.3 MB
Formato Adobe PDF
3.3 MB Adobe PDF Visualizza/Apri PDF

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/872315
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? ND
social impact