Gap-Plasmon Tip-Enhanced Raman Scattering of Semiconductor Nanostructures
Final Report Abstract
This project aimed at investigating gap-plasmon induced enhancement of Raman scattering by semiconductor nanocrystals in the vicinity of metallic nanostructures with nanometric spatial resolution. We also studied local optical phenomena of low-dimensional materials revealing some novel aspects of these systems. The key concept of this project was to utilize the localized surface plasmon resonance (LSPR) of metal nanostructures to induce resonance phenomena in adjacent low dimensional systems and to study the subsequent effects by tipenhanced Raman scattering (TERS) and surface-enhanced Raman scattering (SERS). Semiconducting nanocrystals or quantum dots (QDs) composed of CdSe and CdS with variable sizes were the main model systems studied in this project. They were deposited by the Langmuir-Blodgett technique onto arrays of gold nanostructures. To understand the plasmonic effects thoroughly, especially the impact of LSPR, we employed numerical simulation tools. This helped us to design our experiments in an efficient manner. With this detailed approach, it was possible to study local phonon properties of semiconducting nanostructures with a spatial resolution as low as approximately 2 nm. We also studied surface-enhanced photoluminescence from such nanostructures, which in comparison to SERS is less efficient due to non-radiative decay channels. Beyond the scope of the original project the (nano-) spectroscopic approach was applied to a range of other semiconductor systems. The results of this project reveal some new aspects of low-dimensional semiconductors, which have a significant impact on both fundamental understanding and towards development of technological applications.
Publications
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Nano-Raman Investigation of Monolayer MoS2 at the 2D/Plasmonic Heterointerface, and D.R.T. Zahn, Enhanced Spectroscopies of Semiconductor Quantum Dots and their Interfaces, International Conference on the Formation of Semiconductor Interfaces (ICFSI-17), Shanghai, China
Mahfujur Rahaman
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Tip-Enhanced Raman Scattering (TERS) of MoS2/Plasmonic Heterostructures: Understanding the TERS Sensitivity and Local Heterogeneities at the Interface, International Conference on Optics of Surfaces and Interfaces (OSI 13), Leon, Mexico
Mahfujur Rahaman
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Fine-tuning of localized surface plasmon resonance of metal nanostructures from near-Infrared to blue prepared by nanosphere lithography. Journal of Applied Physics, 128(23).
Rahaman, Mahfujur; Moras, Stefan; He, Lu; Madeira, Teresa I. & Zahn, Dietrich R. T.
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Resonant plasmon enhancement of light emission from CdSe/CdS nanoplatelets on Au nanodisk arrays. The Journal of Chemical Physics, 153(16).
Milekhin, I. A.; Anikin, K. V.; Rahaman, M.; Rodyakina, E. E.; Duda, T. A.; Saidzhonov, B. M.; Vasiliev, R. B.; Dzhagan, V. M.; Milekhin, A. G.; Batsanov, S. A.; Gutakovskii, A. K.; Latyshev, A. V. & Zahn, D. R. T.
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Resonant tip-enhanced Raman scattering by CdSe nanocrystals on plasmonic substrates. Nanoscale Advances, 2(11), 5441-5449.
Milekhin, I. A.; Rahaman, M.; Anikin, K. V.; Rodyakina, E. E.; Duda, T. A.; Saidzhonov, B. M.; Vasiliev, R. B.; Dzhagan, V. M.; Milekhin, A. G.; Latyshev, A. V. & Zahn, D. R. T.
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Conversion of 2-dimensional GaSe to 2-dimensional β-Ga2O3 by thermal oxidation. Nanotechnology, 33(4), 045702.
Schmidt, Constance; Rahaman, Mahfujur & Zahn, Dietrich R. T.
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Investigation of the Phonon Spectra in CdSe/CdS Nanoplatelets by Raman Spectroscopy. Journal of Physics: Conference Series, 2015(1), 012076.
Kurus, N.N.; Milekhin, A.G.; Vasiliev, R.B.; Saidzhonov, B.M.; Anikin, K.V.; Sklyar, R.I.; Batsanov, S.A.; Gutakoskii, A.K.; Latyshev, A.V. & Zahn, D.R.T.
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Observation of Room‐Temperature Dark Exciton Emission in Nanopatch‐Decorated Monolayer WSe2 on Metal Substrate. Advanced Optical Materials, 9(24).
Rahaman, Mahfujur; Selyshchev, Oleksandr; Pan, Yang; Schwartz, Rico; Milekhin, Ilya; Sharma, Apoorva; Salvan, Georgeta; Gemming, Sibylle; Korn, Tobias & Zahn, Dietrich R. T.
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Plasmonic hot electron induced layer dependent anomalous Fröhlich interaction in InSe. Communications Physics, 4(1).
Rahaman, Mahfujur; Aslam, Muhammad Awais; He, Lu; Madeira, Teresa I. & Zahn, Dietrich R. T.
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Understanding the Role of Different Substrate Geometries for Achieving Optimum Tip-Enhanced Raman Scattering Sensitivity. Nanomaterials, 11(2), 376.
He, Lu; Rahaman, Mahfujur; Madeira, Teresa I. & Zahn, Dietrich R.T.
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Controlling excitons in the quantum tunneling regime in a hybrid plasmonic/2D semiconductor interface. Applied Physics Reviews, 9(3).
Ferrera, M.; Rahaman, M.; Sanders, S.; Pan, Y.; Milekhin, I.; Gemming, S.; Alabastri, A.; Bisio, F.; Canepa, M. & Zahn, D. R. T.
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Near-field infrared spectroscopy of SiOx nanowires. Applied Surface Science, 584, 152583.
Milekhin, I.A.; Kozhukhov, A.S.; Sheglov, D.V.; Fedina, L.I.; Milekhin, A.G.; Latyshev, A.V. & Zahn, D.R.T.
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Optical Response of CVD-Grown ML-WS2 Flakes on an Ultra-Dense Au NP Plasmonic Array. Chemosensors, 10(3), 120.
Ferrera, Marzia; Ramò, Lorenzo; Convertino, Domenica; Orlandini, Giorgio; Pace, Simona; Milekhin, Ilya; Magnozzi, Michele; Rahaman, Mahfujur; Zahn, Dietrich R. T.; Coletti, Camilla; Canepa, Maurizio & Bisio, Francesco
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Plasmon-enhanced Raman spectroscopy of two-dimensional semiconductors. Journal of Physics: Condensed Matter, 34(33), 333001.
Rahaman, Mahfujur & Zahn, Dietrich R. T.
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Signature of lattice dynamics in twisted 2D homo/hetero-bilayers. 2D Materials, 9(4), 045018.
Pan, Yang; Li, Shutong; Rahaman, Mahfujur; Milekhin, Ilya & Zahn, Dietrich R. T.
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Surface- and Tip-Enhanced Raman Scattering by CdSe Nanocrystals on Plasmonic Substrates. Nanomaterials, 12(13), 2197.
Milekhin, Ilya A.; Milekhin, Alexander G. & Zahn, Dietrich R. T.
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Tip-Enhanced Raman Spectroscopy of 2D Semiconductors. Recent Developments in Atomic Force Microscopy and Raman Spectroscopy for Materials Characterization. IntechOpen.
Rahaman, Mahfujur & R.T. Zahn, Dietrich
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Local phonon imaging of AlN nanostructures with nanoscale spatial resolution. Nanoscale Advances, 5(10), 2820-2830.
Milekhin, Ilya; Anikin, Kirill; Kurus, Nina N.; Mansurov, Vladimir G.; Malin, Timur V.; Zhuravlev, Konstantin S.; Milekhin, Alexander G.; Latyshev, Alexander V. & Zahn, Dietrich R. T.
