Polarization-controlled optimal scatter suppression in transient absorption spectroscopy

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10370641" target="_blank" >RIV/00216208:11320/17:10370641 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1038/srep43484" target="_blank" >http://dx.doi.org/10.1038/srep43484</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/srep43484" target="_blank" >10.1038/srep43484</a>

Result language

angličtina

Original language name

Polarization-controlled optimal scatter suppression in transient absorption spectroscopy

Original language description

Ultrafast transient absorption spectroscopy is a powerful technique to study fast photo-induced processes, such as electron, proton and energy transfer, isomerization and molecular dynamics, in a diverse range of samples, including solid state materials and proteins. Many such experiments suffer from signal distortion by scattered excitation light, in particular close to the excitation (pump) frequency. Scattered light can be effectively suppressed by a polarizer oriented perpendicular to the excitation polarization and positioned behind the sample in the optical path of the probe beam. However, this introduces anisotropic polarization contributions into the recorded signal. We present an approach based on setting specific polarizations of the pump and probe pulses, combined with a polarizer behind the sample. Together, this controls the signal-to-scatter ratio (SSR), while maintaining isotropic signal. We present SSR for the full range of polarizations and analytically derive the optimal configuration at angles of 40.5 degrees between probe and pump and of 66.9 degrees between polarizer and pump polarizations. This improves SSR by 3 root 3 approximate to 5.2 (or root 3 compared to polarizer parallel to probe). The calculations are validated by transient absorption experiments on the common fluorescent dye Rhodamine B. This approach provides a simple method to considerably improve the SSR in transient absorption spectroscopy.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Project

<a href="/en/project/GA14-25752S" target="_blank" >GA14-25752S: Microscopic environmental determinants and self-regulation of photosynthetic energy transfer</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Scientific Reports

ISSN

2045-2322

e-ISSN

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Volume of the periodical

7

Issue of the periodical within the volume

7

Country of publishing house

GB - UNITED KINGDOM

Number of pages

7

Pages from-to

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UT code for WoS article

000395427700001

EID of the result in the Scopus database

2-s2.0-85014741182