Engineering of the Photon Local Density of States: Strong Inhibition of Spontaneous Emission near the Resonant and High-Refractive Index Dielectric Nano-objects

Abstract

Metallic or dielectric nano-objects change the photon local density of states of closely placed emitters, particularly when plasmon or Mie resonances are present. Depending on the shape and material of these nano-objects, they may induce either a decrease or an increase in decay rates of the excited states of the emitter. In this work, we consider the reduction of the probability of optical transitions in emitters near high-refractive index dielectric (silicon and zinc selenide) nanoparticles. We tune the spectral positions of magnetic and electric modes of nanocylinders to obtain the largest overlap of the valleys in the total decay rate spectra for differently oriented dipoles and, in this way, find the highest inhibition of about 80% for randomly oriented emitters. The spectral positions of these valleys are easy to control since the wavelengths of the modes depend on the height and diameter of nanocylinders. The inhibition value is robust to the distance between the emitter and the nanoparticle in the range of nearly 50 nm, which is crucially important for the applications, such as selective optical transition engineering and photovoltaics.

Enhancement of perovskite spontaneous emission by phase change materials

“…According to Fermi's golden rule the emission rate is related to the integral over all possible final states, which involve the electron and photon wave functions. Thus, the photonic local density of states (LDOS) governs the luminescence properties as well as the overlap of the electronic wave functions [20][21][22]. It is important to note that the wellknown equation for the Purcell factor that is a function of mode volume and quality factor is correct for an emitter located at the center of a Fabry-Perot resonator and for its fundamental frequency only.…”

Quantum Dot Photoluminescence Enhancement in GaAs Nanopillar Oligomers Driven by Collective Magnetic Modes

“…For efficient interaction of the dipole sources with Mie-resonant nanoparticles, they should be localized close to [ 44 ] or inside [ 45 , 46 , 47 ] the nanostructure. Different location of quantum source, shape and material of nanoobjects affect the photonic mode density [ 48 ] resulting in PL intensity variations via Purcell effect [ 49 ]. They also act as nanoantennas [ 50 ] changing initially symmetric emission pattern of QDs, especially under the Kerker conditions [ 51 , 52 ], thus increasing the number of single photons reaching the detectors.…”