DNA-Assembled Plasmonic Waveguides for Nanoscale Light Propagation to a Fluorescent Nanodiamond

Abstract

 Users may download and print one copy of any publication from the public portal for the purpose of private study or research.  You may not further distribute the material or use it for any profit-making activity or commercial gain  You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

Mechanotunable Plasmonic Properties of Colloidal Assemblies

“…The resulting localized surface plasmon resonance (LSPR) evokes intense colors, which are influenced by the size, shape, material, and dielectric environment of the colloidal particle . The resonant field enhancement and subdiffraction electromagnetic energy confinement has led to a variety of applications such as electrochromic smart windows, enhanced oxidation reactions, highly sensitive Raman scattering, energy transport below the diffraction limit, optically active cavities, and nonlinear optical processes . The use of plasmonic back reflectors in photovoltaic devices is of particular interest because they increase the conversion efficiency of inorganic as well as organic solar cells.…”

Complex-k modes of plasmonic chain waveguides

“…Plasmonic chain waveguide in its simple setting has been studied mostly through theoretical modeling [1,[6][7][8][9][10][11][12][13] and, in fewer occasions, through experiments [14][15][16][17][18][19][20][21]. There are several ways to prepare chain waveguides.…”

“…Especially, self-assembly of colloidal particles on wrinkled elastomeric template [21,22] has produced chains with 20 and even more gold nanoparticles with fairly homogeneous particle spacings (<2 nm). Very recently, based on the DNA origami method [23], there have been several work demonstrating well-structured plasmonic chains with gap size precisely controlled at sub-10 nm level [20,[24][25][26]. Nanotechnology is seemingly on its way to make perfect chain structures.…”

“…In [1], it was found after geometrical optimization that propagation length for a silver chain waveguide with a period of 75 nm in vacuum is as short as ∼0.9 μm at nearultraviolet (UV) wavelength. In the latest experimental endeavor [20], a gold chain waveguide was shown to have a propagation loss (L mode) of 0.8dB per 50 nm (which is about one period size), apparently too much for information-transfer applications. Another recent work [25] demonstrated that adding a silver nanoparticle in between two gold nanoparticles can increase energy transfer between the two gold particles.…”

“…It shall be pointed out that most experimental and some theoretical work focused on chains made of a few particles (e.g. [16,20,21,29]). Such short chains, owing to reflections at two ends, support Fabry-Pérot resonances; consequently, a single propagating mode in an originally infinitely periodic waveguide becomes several modes appearing at distinct resonant frequencies.…”