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2017 | Book

General Introduction Read chapter Read first chapter

Studies on the Plasmon-Induced Photoexcitation Processes of Molecules on Metal Surfaces

Author: Dr. Fumika Nagasawa

Publisher: Springer Japan

Book Series : Springer Theses

Part of: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik"

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About this book

This thesis proposes a novel way to catch light energy using an ultrasmall nanostructure. The author has developed photon-materials systems to open the way for novel photoexcitation processes based on the findings obtained from in-situ observation of the systems in which localized surface plasmon (LSP) and molecules interact strongly. The highly ordered metal nanostructure provided the opportunity for anisotropic photoexcitation of materials in an eccentric way. The optimization of the systems via nanostructuring and electrochemical potential control resulted in the novel excitation process using LSP to realize the additional transition for photoexcitation. Furthermore, excited electronic states formed the strong coupling between LSP and excitons of molecules. This thesis will provide readers with an idea for achieving very effective processes for photon absorption, scattering, and emission beyond the present limits of photodevices.

Table of Contents

Frontmatter
Chapter 1. General Introduction
Abstract
The photoexcitation process is the basis for photochemical/physical technologies, such as photoenergy conversion, artificial photosynthesis and light-emitting diodes. If we are able to control the photoexcitation processes, these technologies could be drastically improved. The interaction between light and molecules is extremely restricted due to the intrinsic electronic structure of material. Moreover, the limitation of the maximum strength of interaction in the optimal electronic structure is well known. To address this limitation, the author applied surface plasmons (SPs) for the photoexcitation of materials. In this chapter, the present situation are summarised and discussed.
Fumika Nagasawa
Chapter 2. The Depolarisation Behaviour of Surface-Enhanced Raman Scattering Photons in a Metal Nanodimer Structure
Abstract
The SERS signal showing highly polarised characteristics generally reflects the anisotropic electromagnetic feature of the metal nanostructures. In this chapter, characteristic response of polarised SERS from molecules strongly adsorbed on metal nanostructure was measured to discuss the electronic state at the interface. Polarised SERS measurements give information about both the incident and Raman scattering polarisations, and several interesting polarised SERS behaviour was observed. The polarisation dependence on SERS from a well-ordered Ag dimer array was measured in an aqueous solution containing the target molecule, 4,4’-bipyridine. The polarisation dependence of the scattering photons is discussed with respect to the optical properties of the metal nanostructure and adsorption structure of the target molecule.
Fumika Nagasawa
Chapter 3. Simultaneous Measurement of Surface-Enhanced Raman Scattering and Conductance Using Mechanically Controllable Break Junction Technique
Abstract
Ensemble measurement of the adsorbed molecules and each metal structure showed fluctuation in the depolarisation SERS behaviour and the intensity ratio in the same spectrum. For further investigation of this depolarisation behaviour to know the details on the photoexcitation process, it is important to fabricate a single molecular junction combined with spectroscopy of the single molecule. In this chapter, simultaneous measurement of conductance and polarised SERS in relation to the molecular bridged metal nanojunction is performed. The conductance measurement proves the number of molecules, while polarised Raman measurement proves the orientation and CT character.
Fumika Nagasawa
Chapter 4. Electronic Excitation of an Isolated Single-Walled Carbon Nanotube by Tuning Electrochemical Potential
Abstract
Localised surface plasmon resonance is an effective perturbation to transfer the energy of photons to electrons in the material/molecule interface. Electronic excitation is extremely important in controlling the orientation of the molecules situated on the metal surface and the electronic state at the interface. Single-walled carbon nanotubes (SWNTs) represent a promising tool as an analyte because of their electronic structures, which are well defined by the geometrical structure characterised by chirality. In this chapter, the author measure the polarised Raman measurement performed in the electrochemical environment using a metal nanodimer array.
Fumika Nagasawa
Chapter 5. Raman Enhancement via Polariton States Produced by Strong Coupling Between Localised Surface Plasmons and Dye Excitons in Metal Nanodimers
Abstract
The character of the plasmon-induced photoexcitation process is modulated by the interaction between metal and molecules. Moreover, the energy of photoexcitation process is limited by the intrinsic energy of the materials. The search for active interactions between metals and molecules is necessary to determine the general versatility and wide-range use of photoexcitation. In this chapter, the author reported on the effects of Raman scattering on the formation of nanodimer–organic dye molecule complexes that achieve strong coupling between the plasmons of the nanodimer structure and the excitons of the adsorbed dye molecules.
Fumika Nagasawa
Chapter 6. Electrochemical Control of Strong Coupling Between Localised Surface Plasmons and Dye Excitons
Abstract
An LSP can be regarded as confined light to provide a highly polarised EM field with a specific resonant energy that can effectively interact with excitons of materials. Thus, especially in the strong-coupling regime using LSPs, these properties have attracted wide research interest as an entirely new concept of molecular plasmonics. In this chapter, electrochemical potential control is adopted for tuning the LSPR energy and the definition of the electronic properties of the strong-coupling regime. Raman spectra are also acquired to explore the molecular state in the strong-coupling regime.
Fumika Nagasawa
Backmatter
Metadata
Title
Studies on the Plasmon-Induced Photoexcitation Processes of Molecules on Metal Surfaces
Author
Dr. Fumika Nagasawa
Copyright Year
2017
Publisher
Springer Japan
Electronic ISBN
978-4-431-56579-6
Print ISBN
978-4-431-56577-2
DOI
https://doi.org/10.1007/978-4-431-56579-6

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