Towards polarization-based excitation tailoring for extended Raman spectroscopy

Grosche S, Hünermann R, Sarau G, Christiansen S, Boyd RW, Leuchs G, Banzer P (2020)

Publication Language: English

Publication Type: Journal article

Publication year: 2020

Journal

Optics Express Optical Society of America

URI: https://www.osapublishing.org/oe/abstract.cfm?uri=oe-28-7-10239

DOI: 10.1364/OE.388943

Open Access Link: https://www.osapublishing.org/oe/abstract.cfm?uri=oe-28-7-10239

Abstract

Undoubtedly, Raman spectroscopy is one of the most elaborate spectroscopy tools in materials science, chemistry, medicine and optics. However, when it comes to the analysis of nanostructured specimens or individual sub-wavelength-sized systems, the access to Raman spectra resulting from different excitation schemes is usually very limited. For instance, the excitation with an electric field component oriented perpendicularly to the substrate plane is a difficult task. Conventionally, this can only be achieved by mechanically tilting the sample or by sophisticated sample preparation. Here, we propose a novel experimental method based on the utilization of polarization tailored light for Raman spectroscopy of individual nanostructures. As a proof of principle, we create three-dimensional electromagnetic field distributions at the nanoscale using tightly focused cylindrical vector beams impinging normally onto the specimen, hence keeping the traditional beam-path of commercial Raman systems. In order to demonstrate the convenience of this excitation scheme, we use a sub-wavelength diameter gallium-nitride nanostructure as a test platform and show experimentally that its Raman spectra depend sensitively on its location relative to the focal vector field. The observed Raman spectra can be attributed to the interaction with transverse and pure longitudinal electric field components. This novel technique may pave the way towards a characterization of Raman active nanosystems, granting direct access to growth-related parameters such as strain or defects in the material by using the full information of all Raman modes.

Authors with CRIS profile

Simon Grosche Lehrstuhl für Multimediakommunikation und Signalverarbeitung Richard Hünermann Lehrstuhl für Experimentalphysik (Optik) Gerhard Leuchs Lehrstuhl für Experimentalphysik (Optik)

Involved external institutions

Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light DE Germany (DE) University of Ottawa CA Canada (CA)

How to cite

APA:

Grosche, S., Hünermann, R., Sarau, G., Christiansen, S., Boyd, R.W., Leuchs, G., & Banzer, P. (2020). Towards polarization-based excitation tailoring for extended Raman spectroscopy. Optics Express. https://doi.org/10.1364/OE.388943

MLA:

Grosche, Simon, et al. "Towards polarization-based excitation tailoring for extended Raman spectroscopy." Optics Express (2020).

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