Browsing by Author "Makarov, S. V."

Now showing 1 - 3 of 3

Open Access
High-quality CsPbBr3 perovskite films with modal gain above 10 000 cm−1 at room temperature
(Wiley-VCH Verlag GmbH, 2023-01-29) Tatarinov, D. A.; Anoshkin, S. S.; Tsibizov, I. A.; Sheremet, Volodymyr; Işık, Furkan; Zhizhchenko, A. Y.; Cherepakhin, A. B.; Kuchmizhak, A. A.; Pushkarev, A. P.; Demir, Hilmi Volkan; Makarov, S. V.
Halide perovskite lasers based on CsPbBr3 micro- and nanoscale crystals have demonstrated fascinating performance owing to their low-threshold lasing at room temperature and cost-effective fabrication. However, chemi-cally synthesized thin films of CsPbBr3 usually have rough polycrystalline morphology along with a large amount of crystal lattice defects and, thus, are mostly utilized for the engineering of light-emitting devices. This obstacle prevents their usage in many photonic applications. Here, a protocol to deposit large-grain and smooth CsPbBr3 thin films is developed. Their high quality and large scale allow to demonstrate a maximum optical gain up to 12 900 cm−1 in the spectral range of 530–540 nm, which is a record-high value among all previously reported halide perovskites and bulk semiconductors (e.g., GaAs, GaN, etc.) at room temperature. Moreover, femtosecond laser ablation technique is employed to create high-quality microdisc lasers on glass from these films to obtain excellent lasing characteristics. The revealed critical roles of thickness and grain size for the CsPbBr3 films with extremely high optical gain pave the way for development of low-threshold lasers or ultimately small nanolasers, as well as to apply them for polaritonic logical elements and integrated photonic chips.
Open Access
Observation of enhanced generation of a fifth harmonic from halide perovskite nonlocal metasurfaces
(American Chemical Society, 2023-03-11) Tonkaev, P.; Koshelev, K.; Masharin, Mikhail A.; Makarov, S. V.; Kruk, S. S.; Kivshar, Y.
Lead halide perovskites are widely employed in photonic and light-emitting devices because of their rich optoelectronic properties and simplicity of fabrication based on low-cost flexible technologies. Perovskite bulk crystals and films demonstrate outstanding nonlinear characteristics with large optical nonlinearities exceeding the nonlinear susceptibilities of conventional semiconductor materials by several orders of magnitude. One of the promising approaches for further enhancement of the nonlinear response of perovskites as dielectric photonic materials is to employ optical resonances of structured surfaces, or metasurfaces. Nonlocal metasurfaces supporting lattice modes over many unit cells provide a new approach to both spatial and spectral control of light fields, and they may deliver improved characteristics of nonlinear effects for a wide range of applications associated with broadband excitation of multiple high-quality resonances. Here we report on the first observation of enhanced fifth harmonic generation in MAPbBr3 halide perovskite nonlocal metasurfaces driven by high-quality resonances at the generated harmonic wavelength in the visible frequency range. The demonstrated enhancement is about 2 orders of magnitude compared to an unpatterned MAPbBr3 film of the same thickness, and is broadband by virtue of the excitation of multiple resonant modes in the highly nonlocal regime. Our work suggests a novel approach for achieving parametric processes in resonant dielectric structures with high efficiency.
Open Access
Room-temperature exceptional-point-driven polariton lasing from perovskite metasurface
(John Wiley and Sons Inc, 2023-05-25) Masharin, Mikhail A.; Samusev, A. K.; Bogdanov, A. A.; Iorsh, I. V.; Demir, Hilmi Volkan; Makarov, S. V.
Excitons in lead bromide perovskites exhibit high binding energy and high oscillator strength, allowing for a strong light-matter coupling regime in the perovskite-based cavities localizing photons at the nanoscale. This opens up the way for the realization of exciton-polariton Bose–Einstein condensation and polariton lasing at room temperature – the inversion-free low-threshold stimulated emission. However, polariton lasing in perovskite planar photon cavities without Bragg mirrors has not yet been observed and proved experimentally. In this study, perovskite metasurface is employed, fabricated with nanoimprint lithography, supporting so-called exceptional points to demonstrate the room-temperature polariton lasing. The exceptional points in exciton-polariton dispersion of the metasurface appear upon optically pumping in the nonlinear regime in the spectral vicinity of a symmetry-protected bound state in the continuum providing high mode confinement with the enhanced local density of states beneficial for polariton condensation. The observed lasing emission possesses high directivity with a divergence angle of 1° over one axis. The employed nanoimprinting approach for solution-processable large-scale polariton lasers is compatible with various planar photonic platforms suitable for on-chip integration.