Control of near-infrared dye fluorescence lifetime in all-polymer microcavities

Abstract

The control of radiative decay rate is a crucial issue both for fundamental studies in quantum electrodynamics and for the development of efficient lasers, light emitting devices and photovoltaic cells....

From Landfill to Photonics: The Upcycling of Plastic Waste

“…Since the PBG shift is related to the known dispersion of the photonic band structure, we assume that the observed effect on the PL spectra is intrinsic to the photonic band structure of the DBR and not to the emitters. These results are in full agreement with the theory, ,,− confirming recycled polymer materials do have a future for plastic photonics. To highlight the properties related to the photonic band structure of our system, Figure c shows the ratio between the PL spectra of the DBR recorded at different collection angles and the spectrum of the reference CA film.…”

“…Thus, we can conclude that there is a spectral redistribution of the PL intensity, corresponding to a redistribution of the oscillator strength within the DBR. This is a clear feature of the photonic band structure, consistent with previous findings in the literature, and is controlled by the local density of photonic states (LPDOS). ,,,,− Indeed, for an emitter embedded in a homogeneous medium with refractive index n , the LPDOS shows the typical n ν 3 dependence (ν is the photon frequency). , However, the PhC structure, with its periodic modulation of the refractive index, deeply changes the surrounding medium and leads to a corresponding change in the LPDOS, which is minimum (no photonic states available) at the PBG, while at its edges, the conservation rule for the oscillator strength requires the LPDOS to increase. Far away from the PBG, the LPDOS is not affected.…”

“…Reflectance, transmittance, and fluorescence spectra (excitation at 405 nm, 10 mW power) were recorded using a home-built system described previously that allows angle-resolved detection. 25 Scanning Electron Microscopy (SEM). SEM observations were carried out using a Tescan Mira3 LM FE on film cross sections obtained by brittle fracture of the samples in liquid nitrogen.…”

“…Reflectance, transmittance, and fluorescence spectra (excitation at 405 nm, 10 mW power) were recorded using a home-built system described previously that allows angle-resolved detection …”

On-chip organic optoelectronic system for fluorescence detection

“…The optical performance of polymer DBRs have been demonstrated in several photonic fields. [33][34][35] The strong angle-dependent characteristics of the DBR filter is one of the key-enabling factors that allows to reach high sensing performance once the correct layout of integration is identified. Optical simulations are implemented, considering angle-and wavelengthdependent efficiencies of all components, to determine the optimal size and relative positioning of the elements in the integrated system, as well as to predict the output signal from the sensor.…”