Titanium Nitride Modified Photoluminescence from Single Semiconductor Nanoplatelets

Abstract

Titanium nitride (TiN) is an alternative plasmonic material that has the potential for visible and nearinfrared optical applications due to their distinct properties. Here, coupling effects between TiN This article is protected by copyright. All rights reserved. 2 nanohole array films and nearby excitonic emitters, semiconductor nanoplatelets (NPLs), are investigated using single particle spectroscopy. At the emission wavelength of the NPLs, the local field enhancement close to the surface of the TiN nanohole array films induces an increase in the radiative decay rates of the emitters by a factor of up to 2. This effect diminishes quickly as the distance between the TiN nanohole array films and emitters increases. At short wavelengths where the NPLs are excited, the TiN nanohole array films exhibit lossy dielectric characteristics. Local field modification at these wavelengths leads to a reduced local density of electromagnetic states, and hence the photoluminescence intensity of the emitters. This study shows the potential of TiN as an alternative plasmonic material for optoelectronic and photonic applications, especially in the long wavelength ranges.

Strain-Induced Trapping of Indirect Excitons in MoSe2/WSe2 Heterostructures

“…The much longer lifetimes of the IXs compared to these of the intralayer excitons is caused by the spatial separation of electrons and holes in the two different monolayers comprising the heterostructures, which reduces the wave function overlaps between the electrons and holes and, according to the Fermi's golden rule, the corresponding oscillator strength of the optical transitions. 45,46 This reduction in the oscillator strength and increase in the radiative lifetime can also lead to an enhanced contribution from the nonradiaitve recombination processes, which further increase the observed PL lifetimes, as we will discuss below.…”

Interface study of thermally driven chemical kinetics involved in Ti/Si3N4 based metal-substrate assembly by X-ray photoelectron spectroscopy

“…Moreover, as TiN appears to be the majority phase, the presented substrate mediated nitridation technique can be adopted to fabricate stoichiometric TiN which is known for its versatile functionalities in the field of superconductivity [72,73], optics [74], plasmonics [75][76][77][78], ceramics [79,80] and in many other multidisciplinary areas [81][82][83][84][85]. Besides, the combination of TiN and TiSi2 based binary composites can eventually serve as Ti-Si-N based ternary family of composite materials that can be produced without the presence of any external source of N and Si.…”

Microcavity-Modified Emission from Rare-Earth Ion-Based Molecular Complexes

“…The most plausible mechanisms that may lead to the observed PL enhancement and accelerated spontaneous emission mainly include the cavity-induced Purcell effect, , amplified spontaneous emission, , and superradiance. − We first evaluate the influence of the Purcell effect by estimating the Purcell factor, F P , of the system, which can be derived theoretically from , where λ is the emission wavelength, n the refractive index at the position of the emitter, V the cavity mode volume, and Q the quality factor of the cavity. We extract the Q values of the cavities to be around 35 from the reflection spectrum at k ∥ = 0.…”

“…The most plausible mechanisms that may lead to the observed PL enhancement and accelerated spontaneous emission mainly include the cavity-induced Purcell effect, 22,23 amplified spontaneous emission, 24,25 and superradiance. 26−28 We first evaluate the influence of the Purcell effect by estimating the Purcell factor, F P , of the system, which can be derived theoretically 29…”