Revising of the Purcell effect in periodic metal-dielectric structures: the role of absorption

Abstract

Periodic metal-dielectric structures attract substantial interest since it was previously proposed that the spontaneous emission amplification rates (the Purcell factor) in such structures can reach enormous values up to 10 5 . However, the role of absorption in real metals has not been thoroughly considered. We provide a theoretical analysis showing that absorption leads to diminishing values of Purcell factor. We also suggest that using emitting organic compounds such as CBP (4,4-Bis(N-carbazolyl)-1,1-biphenyl) can lead to a moderate increase of about an order of magnitude in the Purcell factor. Defining the experimentally measured Purcell factor as a ratio between the excited state lifetimes in bare CBP and in periodic structure, this increase in the fabricated periodic structure is demonstrated through a 4–8 times decrease in excited state radiative lifetime compared to a bare organic material in a wide emission spectrum.

Purcell Enhancement and Wavelength Shift of Emitted Light by CsPbI3 Perovskite Nanocrystals Coupled to Hyperbolic Metamaterials

“… 32 − 36 The photon emission rate enhancement has been experimentally investigated using periodical metal-dielectric structures for different types of single emitters (dye molecules, metal–organic complexes, and quantum dots), 37 − 40 as also confirmed theoretically. 41 , 42 It is worth noting the study of recombination rate enhancement using a film of CsPbBr 3 PNCs deposited by spin coating on top of single and double metal–insulator–metal cavities. 43 The advantage of using HMMs along with simple deposition techniques of PNCs does not require any deterministic positioning of the QE, as in the case of 2D photonic cavities.…”

Control of the surface plasmon dispersion and Purcell effect at the metamaterial-dielectric interface

“…The values of the Purcell factor have been calculated using the method described in detail previously 21 . In brief, we solve the Maxwell equation by postulating that the wave propagates along the layers, and its amplitude vanishes when moving away from the interface.…”

“…Previously, it was proposed that the major enhancement of the spontaneous emission probability can be achieved in plasmonic structures due to a high local density of states (LDOS) 19 . However, this conclusion has been argued 20 in recently published paper 21 , where it was demonstrated that for the frequency range, where the LDOS peak is occurring, this enhancement is dramatically reduced due to light absorption in metals. Nevertheless, the existence of features in the dispersion curve suggests that the effective utilization of the surface plasmons still can be achieved 22 .…”

Unprecedented Fluorophore Photostability Enabled by Low‐Loss Organic Hyperbolic Materials

“…For Ag, the resonance peak wavelength is centered around 440 nm, [ 39 ] and for Au it is centered at 620 nm. [ 40–42 ] TiN‐based HMMs, [ 43,44 ] Ag‐based HMMs, [ 20,21,23,33,45–50 ] and Au‐based HMMs [ 40,51,52 ] support a broadband but relatively small PF. The OHMs used in this work provide PFs two orders of magnitude larger than the values found in those plasmonic materials, and even comparable to the values attained by using plasmonic nanostructures such as nanoantennae, [ 11,41 ] nanocavities, [ 53 ] and nanogratings [ 21,48 ] in the spectral range of 480–560 nm.…”