December 21, 2019 Journal article Open Access

Dzmitry V Yakimchuk; Egor Yu Kaniukov; Sergey Lepeshov; Victoria D Bundyukova; Sergey E Demyanov; Grigory M Arzumanyan; Nelya V Doroshkevich; Kahramon Z Mamatkulov; Arne Bochmann; Martin Presselt; Ondrej Stranik; Soslan A Khubezhov; Alex Krasnok; Andrea Alù; Vladimir A Sivakov

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    <subfield code="u">Department of Physic, ITMO University, 49 Avenue Kronverksky 197101 St. Petersburg, Russian Federation &amp; Photonics Initiative, Advanced Science Research Center, 85 St. Nicholas Terrace, 10031 New York, United States</subfield>
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    <subfield code="u">Photonics Initiative, Advanced Science Research Center, 85 St. Nicholas Terrace, 10031 New York, United States &amp; Physics Program, Graduate Center City University of New York, 85 St. Nicholas Terrace 10031 New York, United States &amp; Department of Electrical Engineering, City College of New York, 85 St. Nicholas Terrace 10031 New York, United States</subfield>
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    <subfield code="a">Dzmitry V Yakimchuk</subfield>
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    <subfield code="a">Self-organized spatially separated silver 3D dendrites as efficient plasmonic nanostructures for Surface-enhanced Raman spectroscopy applications</subfield>
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    <subfield code="a">&lt;p&gt;Surface-enhanced Raman spectroscopy (SERS) is a promising optical method for analyzing molecular samples of various nature. Most SERS studies are of an applied nature indicating a serious potential for their application in analytical practice. Dendrite-like nanostructures have great potential for SERS, but the lack of a method for their predictable production significantly limits their implementation. In this paper, a method for controllable obtaining spatially separated, self-organized and highly-branched silver dendrites via template synthesis in pores of SiO2/Si is proposed. The dendritic branches have nanoscale roughness creating many plasmon-active &amp;ldquo;hot spots&amp;rdquo; required for SERS. The first held 3D modeling of the external electromagnetic wave interaction with such a dendrite, as well as experimental data, confirm this theory. Using the example of a reference biological analyte, which is usually used as a label for other biological molecules, the dendrites SERS-sensitivity up to 10&amp;ndash;15 M was demonstrated with Enhancement factor of 108. The comparison of simulation results with SERS experiments allows distinguishing the presence of electromagnetic and chemical contributions, which have a different effect at various analyte concentrations.&lt;/p&gt;</subfield>
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