Light-Emitting Halide Perovskite Nanoantennas

Abstract

Nanoantennas made of high-index dielectrics with low losses in visible and infrared frequency ranges have emerged as a novel platform for advanced nanophotonic devices. On the other hand, halide perovskites are known to possess high refractive index, and they support excitons at room temperature with high binding energies and quantum yield of luminescence that makes them very attractive for all-dielectric resonant nanophotonics. Here we employ halide perovskites to create light-emitting nanoantennas with enhanced photoluminescence due to the coupling of their excitons to dipolar and multipolar Mie resonances. We demonstrate that the halide perovskite nanoantennas can emit light in the range of 530-770 nm depending on their composition. We employ a simple technique based on laser ablation of thin films prepared by wet-chemistry methods as a novel cost-effective approach for the fabrication of resonant perovskite nanostructures.

All‐Optical Nanoscale Heating and Thermometry with Resonant Dielectric Nanoparticles for Controllable Drug Release in Living Cells

“…Despite the fact that larger -Fe 2 O 3 NPs do not possess a perfect spherical shape, the aspect ratio remains sufficiently low to maintain the quasi-spherical approach reasonable for theoretical calculations, since the factor of facets for resonant dielectric NPs is almost negligible as shown in previous works. [8,10] X-ray photoelectron spectroscopy (XPS) results confirm that NPs are composed of iron oxide (Figure 3b). However, the peaks in the obtained spectra correspond to both +II and +III oxidation states (i.e.…”

“…In this work, we incorporate optically resonant dielectric NPs into polymer capsules for all‐optical remote drug release with simultaneous nanothermometry upon laser irradiation. In order to achieve high optical field enhancement in the NPs and their efficient heating, we employ biocompatible iron oxide (α‐Fe 2 O 3 ) NPs instead of previously used dielectric ones, owing to their high refractive index (2.7–3.2) and moderate losses (0.02–0.2) in red and near‐infrared (NIR) ranges . This phase of iron oxide has very pronounced and easily recognizable multipeak Raman response in broad range of wavenumbers (200–1400 cm −1 ), making it much more convenient for temperature‐induced peak shift registration as compared to the silicon possessing only one Raman‐active phonon mode .…”

Active meta-optics and nanophotonics with halide perovskites

“…In the work 26 , pronounced Mie resonances were observed experimentally in individual nanoparticles smaller than 500 nm made of different types of halide perovskite MAPb(Br x I 1−x ) 3 , as shown schematically in Fig.8a. As we discussed in previous sections, the main advantages of Mie resonances are local field enhancement and far-field control for incident light, as well as acceleration of radiative recombination at the emission wavelength of material.…”

“…Moreover, in situ chemical variation of the perovskites band gap 24,25 and, thus, the spectrum of their luminescence, opens up unprecedented opportunities for reconfigurable nanophotonic devices not achievable with the use of the conventional GaAs platform. As a result, halide perovskite nanoparticles 26 , nanowires 27,28 , microdisks 29 , microplates 30 , nanoscale gratings 31 , and metasurfaces 32,33 are easy to fabricate and process, and they can become a convenient and cheap part of optical circuitry in the near future 34 . Nevertheless, the existing silicon-based platform is much more developed for on-chip integrated photonics 35 , but it is expected to be outperformed by the perovskites in the future.…”

“…Creation of perovskite nanoparticles with a quasi-spherical shape and much higher precision of spatial positioning was demonstrated by means of laser transfer technique 26,95 . It represents a physical method (laser ablation) to obtain single perovskite nanoparticles flying from spin-coated perovskite films to an arbitrary substrate.…”