Angular Redistribution of Near-Infrared Emission from Quantum Dots in Three-Dimensional Photonic Crystals

Abstract

We study the angle-resolved spontaneous emission of near-infrared light sources in 3D photonic crystals over a wavelength range from 1200 to 1550 nm. To this end PbSe quantum dots are used as light sources inside titania inverse opal photonic crystals. Strong deviations from the Lambertian emission profile are observed. An attenuation of 60 % is observed in the angle dependent radiant flux emitted from the samples due to photonic stop bands. At angles that correspond to the edges of the stop band the emitted flux is increased by up to 34 %. This increase is explained by the redistribution of Bragg-diffracted light over the available escape angles. The results are quantitatively explained by an expanded escape-function model. This model is based on diffusion theory and adapted to photonic crystals using band structure calculations. Our results are the first angular redistributions and escape functions measured at near-infrared, including telecom,wavelengths. In addition, this is the first time for this model to be applied to describe emission from samples that are optically thick for the excitation light and relatively thin for the photoluminesence light.

Polymer-based self-assembled photonic crystals to tune light transport and emission

“…Self-assembled photonic crystals with stop gaps lead only to directionally modified spontaneous emission. [74][75][76] Macroscopic emission spectroscopy experiments performed on self-assembled photonic crystals infiltrated with dye as an emitting source reveal suppression of the emission intensity by as much as B50%. 74,77 Unavoidable disorder and defects in self-organized microsphere assemblies lead to unwanted light scattering in a crystal, which can help emitted light to escape in different directions.…”

Cavity quantum electrodynamics with three-dimensional photonic band gap crystals

“…Consequently the cw intensity I(ω eg ) of the emitters becomes proportional to γ rad , hence I(ω eg ) is then an excellent probe of the LDOS. If one studies the cw intensity I(ω eg ) to obtain information on the crystal's LDOS, care must be taken to distinguish spectral features from several other effects, such as angular effects related to photonic bandstructures, as well as the angledependent excitation and the angle-dependent collection efficiency [38,43]. To interpret results in terms of the LDOS, the observed intensity spectrum I(ω eg ) is normalized to a reference that employs the same light sources in the same chemical environment.…”

Green Color Purification in Tb3+ Ions through Silica Inverse Opal Heterostructure

“…3,8 This feature can be exploited to control the spontaneous emission of an embedded light emitter in PhCs by manipulating the local photonic density of state. Several studies have been undertaken on the nature of spontaneous emission of semiconductors quantum dots [9][10][11] , organic dyes [12][13][14] and rare-earth ions [15][16][17][18][19][20] containing PhCs. In recent years, immense interest has aroused in (i) complex PhCs, produced by introduction of crystal defects (such as point, 8,[21][22] line, [23][24][25] or planar [26][27] ) and (ii) photonic crystal heterostructures [28][29][30] (termed as PhCHs) due to their potential in improving ultra-high quality nanocavity and light harvesting efficiency besides developing quality optical filters.…”