Universität zu Köln

Perlangeli, Michele, Peli, Simone, Soranzio, Davide, Puntel, Denny, Parmigiani, Fulvio and Cilento, Federico (2020). Polarization-resolved broadband time-resolved optical spectroscopy for complex materials: application to the case of MoTe2 polytypes. Opt. Express, 28 (6). S. 8819 - 8830. WASHINGTON: OPTICAL SOC AMER. ISSN 1094-4087

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Abstract

Time-resolved optical spectroscopy (TR-OS) has emerged as a fundamental spectroscopic tool for probing complex materials, to both investigate ground-state-related properties and trigger phase transitions among different states with peculiar electronic and lattice structures. We describe a versatile approach to perform polarization-resolved TR-OS measurements, by combining broadband detection with the capability to simultaneously probe two orthogonal polarization states. This method allows us to probe, with femtoseconds resolution, the frequency-resolved reflectivity or transmittivity variations along two mutually orthogonal directions, matching the principal axis of the crystal structure of the material under scrutiny. We report on the results obtained by acquiring the polarization-dependent transient reflectivity of two polytypes of the MoTe2 compound, with 2H and 1T' crystal structures. We reveal marked anisotropies in the time-resolved reflectivity signal of IT'-MoTe2, which are connected to the crystal structure of the compound. Polarization- and time- resolved spectroscopic measurements can thus provide information about the nature and dynamics of both the electronic and crystal lattice subsystems, advancing the comprehension of their inter-dependence, in particular in the case of photoinduced phase transitions; in addition, they provide a broadband measurement of transient polarization rotations. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Perlangeli, Michele UNSPECIFIED UNSPECIFIED UNSPECIFIED Peli, Simone UNSPECIFIED UNSPECIFIED UNSPECIFIED Soranzio, Davide UNSPECIFIED UNSPECIFIED UNSPECIFIED Puntel, Denny UNSPECIFIED UNSPECIFIED UNSPECIFIED Parmigiani, Fulvio UNSPECIFIED UNSPECIFIED UNSPECIFIED Cilento, Federico UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-340877
DOI:	10.1364/OE.385419
Journal or Publication Title:	Opt. Express
Volume:	28
Number:	6
Page Range:	S. 8819 - 8830
Date:	2020
Publisher:	OPTICAL SOC AMER
Place of Publication:	WASHINGTON
ISSN:	1094-4087
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ULTRAFAST; SUPERCONTINUUM; GENERATION; MODULATION; TRANSITION Multiple languages Optics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/34087