Spatial and Fourier-space distribution of confined optical Tamm modes

Abstract

In this paper, we characterize the electric field distribution of confined optical modes in a 0D Tamm structure, consisting in a metallic disk deposited on a Bragg mirror. The modes are probed at room temperature, through the fluorescence of semiconductor colloidal nanocrystals. We perform a combined analysis of the resonant modes distribution in both direct space and Fourier space and show, in good agreement with numerical simulations, that a subportion of the structure will radiate with a different angular distribution depending on its position. Such analysis is shown to probe the gradient of the phase of the confined optical modes.

Confined Tamm optical states coupled to quantum dots in a photoconductive detector

“…5 for the 11 lm and 15 lm disks. Previous measurements by Fourier microscopy on confined Tamm structures have indicated 27,28 that excitation of large Tamm disks at different real-space positions results in different spectral responses in k-space. This behavior is the real-space equivalent of this k-space behavior.…”

Active control of radiation beaming from Tamm nanostructures by optical microscopy

“…The localized Tamm states structures fabrication was described in [22,23] and is briefly summarized here: a TiO 2 /SiO 2 λ/4 Bragg mirror was fabricated with stop band centered at 640 nm (7 pairs, SiO 2 index 1.44, TiO 2 index 2.25, maximum reflectivity 98%, manufacturer Kerdry, France). The upper layer was a 80 nm SiO 2 thin film, in order to position the emitters at a height inside the sample where the Tamm-state electric field is maximum.…”

“…A 55 nm silica layer was finally deposited for tuning the Tamm mode at resonance with the nanocrystals' emission. Optical lithography (lift-off resist, 350 nm thickness) was then used to create holes and deposit Ag disks with several microns diameter and 45 nm thickness, which were finally covered by a protective 50 nm layer of PMMA (as in [23], there was no lift-off of the unexposed resist in order to reduce the luminescence from the nanocrystals located outside the disk). The obtained structures are known to exhibit 0D-Tamm states confined between the Bragg mirror and the Ag layer, and localized below the disk [17,22].…”