scholarly journals Exciton-acoustic phonon coupling revealed by resonant excitation of single perovskite nanocrystals

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yan Lv ◽  
Chunyang Yin ◽  
Chunfeng Zhang ◽  
Xiaoyong Wang ◽  
Zhi-Gang Yu ◽  
...  
Keyword(s):  
Acoustic Phonon ◽  
Laser Light ◽  
Light Sources ◽  
Resonance Fluorescence ◽  
Photoluminescence Excitation ◽  
Phonon Coupling ◽  
Research Attention ◽  
Perovskite Nanocrystals ◽  
Piezoelectric Potential ◽  
Exciton Dephasing

AbstractSingle perovskite nanocrystals have attracted great research attention very recently due to their potential quantum-information applications, which critically depend on the development of powerful optical techniques to resolve delicate exciton photophysics. Here we have realized resonant and near-resonant excitations of single perovskite CsPbI3 nanocrystals, with the scattered laser light contributing to only ~10% of the total collected signals. This allows us to estimate an ultranarrow photoluminescence excitation linewidth of ~11.32 µeV for the emission state of a single CsPbI3 nanocrystal, corresponding to an exciton dephasing time of ~116.29 ps. Meanwhile, size-quantized acoustic phonons can be resolved from a single CsPbI3 nanocrystal, whose coupling with the exciton is proposed to arise from the piezoelectric potential. The ability to collect resonance fluorescence from single CsPbI3 nanocrystals, with the subsequent revelation of exciton-acoustic phonon coupling, has marked a critical step towards their steady advancement into superior quantum-light sources.

scholarly journals Long Exciton Dephasing Time and Coherent Phonon Coupling in CsPbBr2Cl Perovskite Nanocrystals

Nano Letters ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 7546-7551 ◽  
Author(s):  
Michael A. Becker ◽  
Lorenzo Scarpelli ◽  
Georgian Nedelcu ◽  
Gabriele Rainò ◽  
Francesco Masia ◽  
...  
Keyword(s):  
Coherent Phonon ◽  
Phonon Coupling ◽  
Dephasing Time ◽  
Perovskite Nanocrystals ◽  
Exciton Dephasing

Disentangling Electron–Phonon Coupling and Thermal Expansion Effects in the Band Gap Renormalization of Perovskite Nanocrystals

2020 ◽  
pp. 569-575
Author(s):  
Andrea Rubino ◽  
Adrián Francisco-López ◽  
Alex J. Barker ◽  
Annamaria Petrozza ◽  
Mauricio E. Calvo ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Band Gap ◽  
Phonon Coupling ◽  
Perovskite Nanocrystals ◽  
Electron Phonon Coupling

scholarly journals Acoustic phonon lifetimes limit thermal transport in methylammonium lead iodide

2018 ◽  
Vol 115 (47) ◽  
pp. 11905-11910 ◽  
Author(s):  
Aryeh Gold-Parker ◽  
Peter M. Gehring ◽  
Jonathan M. Skelton ◽  
Ian C. Smith ◽  
Dan Parshall ◽  
...  
Keyword(s):  
Lattice Dynamics ◽  
Acoustic Phonon ◽  
Optoelectronic Devices ◽  
High Energy ◽  
High Energy Resolution ◽  
Phonon Coupling ◽  
Lead Iodide ◽  
Phonon Modes ◽  
Electron Phonon Coupling ◽  
Methylammonium Lead Iodide

Hybrid organic–inorganic perovskites (HOIPs) have become an important class of semiconductors for solar cells and other optoelectronic applications. Electron–phonon coupling plays a critical role in all optoelectronic devices, and although the lattice dynamics and phonon frequencies of HOIPs have been well studied, little attention has been given to phonon lifetimes. We report high-precision momentum-resolved measurements of acoustic phonon lifetimes in the hybrid perovskite methylammonium lead iodide (MAPI), using inelastic neutron spectroscopy to provide high-energy resolution and fully deuterated single crystals to reduce incoherent scattering from hydrogen. Our measurements reveal extremely short lifetimes on the order of picoseconds, corresponding to nanometer mean free paths and demonstrating that acoustic phonons are unable to dissipate heat efficiently. Lattice-dynamics calculations using ab initio third-order perturbation theory indicate that the short lifetimes stem from strong three-phonon interactions and a high density of low-energy optical phonon modes related to the degrees of freedom of the organic cation. Such short lifetimes have significant implications for electron–phonon coupling in MAPI and other HOIPs, with direct impacts on optoelectronic devices both in the cooling of hot carriers and in the transport and recombination of band edge carriers. These findings illustrate a fundamental difference between HOIPs and conventional photovoltaic semiconductors and demonstrate the importance of understanding lattice dynamics in the effort to develop metal halide perovskite optoelectronic devices.

scholarly journals Medical Industry Trends That Promote the Use of Optical Medicine Fiber

2021 ◽  
pp. 76-79
Author(s):  
Dr. R. Thillaikkarasi ◽  
Sindhuja R ◽  
Sivabharati M ◽  
Abira Bright ◽  
Sreejith V
Keyword(s):  
Optical Fibers ◽  
Laser Light ◽  
Light Sources ◽  
Healthcare Industry ◽  
Future Prospects ◽  
Enabling Technology ◽  
Instruments And Techniques ◽  
Ancient Times ◽  
New Generation ◽  
Industry Trends

Optics has, since ancient times, being used as aid for the exam human patients and in some therapeutic treatments. Many of the optic medical instruments in use today were developed in the nineteenth century and, with the advent of optical fibers and laser light sources in the mid twentieth century, a new generation of medical devices, instruments, and techniques have been developed that have helped modernize medicine and perform task unimaginable only a few decades ago. This chapter illustrates through several optical instrument and application examples the uses, benefits, and future prospects that optics brings as an enabling technology to the medicine and the overall healthcare industry.

scholarly journals Coherent Ray Tracing Simulation Of Non-Imaging Laser Beam Shaping With Multi-Aperture Elements

2019 ◽  
Vol 215 ◽  
pp. 01001
Author(s):  
Raoul Kirner ◽  
Wilfried Noell ◽  
Toralf Scharf ◽  
Reinhard Voelkel
Keyword(s):  
Ray Tracing ◽  
Continuous Wave ◽  
Laser Light ◽  
Traditional Approach ◽  
Statistical Treatment ◽  
Diffraction Theory ◽  
Beam Shaping ◽  
Optical Systems ◽  
Light Sources ◽  
Mask Aligner

The application of laser light sources for illumination tasks like in mask aligner lithography relies on non-imaging optical systems with multi-aperture elements for beam shaping. When simulating such systems, the traditional approach is to separate the beam-shaping part (incoherent simulation) from dealing with coherence properties of the illuminating laser light source (diffraction theory with statistical treatment). We present an approach using Gaussian beam decomposition to include coherence simulation into ray tracing, combining these two parts, to get a complete picture in one simulation. We discuss source definition for such simulations, and verify our assumptions on a well-known system. We then apply our approach to an imaging beam shaping setup with microoptical multi-aperture elements. We compare the simulation to measurements of a similar beam-shaping setup with a 193 nm continuous-wave laser in a mask-aligner configuration.

scholarly journals Observation of Small Polaron and Acoustic Phonon Coupling in Ultrathin La 0.7 Sr 0.3 MnO 3 /SrTiO 3 Structures

2019 ◽  
Vol 13 (5) ◽  
pp. 1800657
Author(s):  
Bo Liu ◽  
Wei Niu ◽  
Xuezhong Ruan ◽  
Chunhui Zhu ◽  
Xuefeng Wang ◽  
...  
Keyword(s):  
Acoustic Phonon ◽  
Small Polaron ◽  
Phonon Coupling

scholarly journals Strong Carrier–Phonon Coupling in Lead Halide Perovskite Nanocrystals

ACS Nano ◽  
2017 ◽  
Vol 11 (11) ◽  
pp. 11024-11030 ◽  
Author(s):  
Claudiu M. Iaru ◽  
Jaco J. Geuchies ◽  
Paul M. Koenraad ◽  
Daniël Vanmaekelbergh ◽  
Andrei Yu. Silov
Keyword(s):  
Phonon Coupling ◽  
Perovskite Nanocrystals ◽  
Halide Perovskite ◽  
Lead Halide
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