Physics Commons^™

Hot Electron Chemistry On Bimetallic Plasmonic Nanoparticles, Bryn E. Merrill, Bingjie Zhang, Jerry Larue

Student Scholar Symposium Abstracts and Posters

Catalysis provides pathways for efficient and selective chemical reactions through the lowering of energy barriers for desired products. Gold nanoparticles (AuNP) show excellent promise as plasmonic catalysts. Localized surface plasmon resonances are oscillations of the electron bath at the surface of a nanoparticle that generate energetically intense electric fields and rapidly decay into energetically excited electrons. The excited electrons have the potential to destabilize strongly bound oxygen atoms through occupation of accessible anti-bonding orbitals. Tuning the anti-bonding orbitals to make them accessible for occupancy will be achieved by coating the AuNP in a thin layer of another transition metal, such …

Compact Sensing Platforms Based On Localized Surface Plasmon Resonance, Zhutian Ding

Electronic Thesis and Dissertation Repository

The development of plasmonic sensors mainly focuses on the improvement of their sensitivities that are approaching the theoretical limit. This work aims to propose, fabricate and characterize compact sensing platforms that are highly adaptable and easy to be miniaturized, without compromising their sensitivities. A plasmonic sensing system that allows the excitation of localized surface plasmon resonance (LSPR) by individual waveguide modes is presented conceptually and experimentally. Another compact sensing platform is proposed based on the ensemble hypothesis developed in this thesis.

A Mass-Producible And Versatile Sensing System: Localized Surface Plasmon Resonance Excited By Individual Waveguide Modes, Zhutian Ding, James M. Stubbs, Danielle Mcrae, Johanna M. Blacquiere, François Lagugné-Labarthet, Silvia Mittler

Physics and Astronomy Publications

A plasmonic sensing system that allows the excitation of localized surface plasmon resonance (LSPR) by individual waveguide modes is presented conceptually and experimentally. Any change in the local environment of the gold nanoparticles (AuNPs) alters the degree of coupling between LSPR and a polymer slab waveguide, which then modulates the transmission-output signal. In comparison to conventional LSPR sensors, this system is less susceptible to optical noise and positional variation of signals. Moreover, it enables more freedom in the exploitation of plasmonic hot spots with both transverse electric (TE) and transverse magnetic (TM) modes. Through real-time measurement, it is demonstrated that …

Plasmonic Enhancement Of Organic Light Emitting Diodes (Oleds) With Periodic And Random Nanostructures, Pavel Markeev

Graduate Masters Theses

This revised thesis has been submitted in 2021 due to findings of academic misconduct in the original thesis. The misconduct included improper citation and plagiarism of Dr. Khadir’s PhD thesis [1], particularly in the introduction, the state of the art and images 1.1-1.6, 2.4, 3.2, 3.4.

The localized surface plasmon resonance (LSPR) is known as a phenomenon that allow to enhance the efficiency of Organic Light Emitting Diodes (OLED). This work researches the dependence of OLED performance with and without metallic nanoparticle incorporated in the organic layers. Diodes with periodic (PMN) and random (RMN) metallic nanoparticles along with both types …

Optical Characterization Of Anisotropic Interfaces, Renjie Hou

Electronic Thesis and Dissertation Repository

The understanding of optical properties of surfaces and interfaces are critical for the development of new technologies ranging from photonics to molecular electronics. Knowing for example the orientation of molecules functionalized onto a surface yields valuable information about the macroscopic properties of the resulting surface. The optical properties can be tuned using various strategies such as molecular functionalization or patterning of meta-structures that ultimately interact with light in a rational way. Advanced optical and spectroscopy methods allowing one to probe such surfaces are therefore key to correlate properties and surface functionalization.

In this thesis, multiple approaches have been taken to …

Localized Surface Plasmon Resonance Of Single Silver Nanoparticles Studied By Dark-Field Optical Microscopy And Spectroscopy, Wei Cao, Tao Huang, Xiao-Hong Nancy Xu, Hani E. Elsayed-Ali

Electrical & Computer Engineering Faculty Publications

Localized surface plasmon resonance (LSPR) of Ag nanoparticles (NPs) with different shapes and disk-shaped Ag NP pairs with varying interparticle distance is studied using dark-field optical microscopy and spectroscopy (DFOMS). Disk-, square-, and triangular-shaped Ag NPs were fabricated on indium tin oxide-coated glass substrates by electron beam lithography. The LSPR spectra collected from single Ag NPs within 5×5 arrays using DFOMS exhibited pronounced redshifts as the NP shape changed from disk to square and to triangular. The shape-dependent experimental LSPR spectra are in good agreement with simulations using the discrete dipole approximation model, although there are small deviations in the …