Nonlinear transmission, ultrafast relaxation and three-photon absorption in reduced SrTiO3

Demchuk, M. I.; Konevskii, V. S.; Кулешов, Н. В.; Mikhailov, V. P.; Prokoshin, P. V.; Yumashev, K. V.

doi:10.1016/0030-4018(91)90458-p

Cited by 18 publications

(5 citation statements)

References 7 publications

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“…Table 3 summarizes the measured 3PA coefficients reported for 3D perovskites. [39,52,54,60,81,82] It is interesting to compare these experimental data with theoretical models. With the theoretically quantitative model, one may design and synthesize 3D perovskites with the maximized magnitude of 3PA at a certain wavelength of light.…”

Section: Three-photon Absorption (3pa) In 3d Perovskite Crystals and Filmsmentioning

confidence: 99%

“…as a function of x = ℏω/E g in Figure 2c, it is found that the reported 3PA coefficients of CsPbCl 3 , MAPbCl 3 and SrTiO 3 are in, or, near the gray area as predicted by Equation ( 5) with S 3 * being in the range from 28 000 to 52 000. [39,52,54,81] By utilizing the technique of PLbased, wavelength-dependent, Z-scan nonlinear spectroscopy, Clark and co-workers determined 3PA coefficients of CsPbBr 3 bulk crystals, see the green triangle dots in Figure 2c, in a broad wavelength range from 1100 to 1700 nm. [39] The α 3 values are close to the trend estimated by the two-band model.…”

Section: Three-photon Absorption (3pa) In 3d Perovskite Crystals and Filmsmentioning

confidence: 99%

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Perovskites: Multiphoton Absorption and Applications

Zhou

Ran

Fan

et al. 2021

Advanced Optical Materials

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critical temperature superconductivity, ferroelectric semiconductor-based cells for solar-energy conversion and others. Analogous to the oxide counterparts, metal lead halide perovskites (MLHPs) (represented by CsPbX 3 , X = I, Br, Cl) also exhibit a cubic lattice in 3Ds at room temperature, as illustrated in Figure 1, but with high-defect tolerance. [9,10] Commonly, their defect tolerance is a major enabling factor for their remarkable optoelectronic properties, such as considerable optical absorption coefficients, long carrier diffusion lengths, and high photoluminescence (PL) efficiency. [11][12][13][14] Furthermore, MLHPs can be synthesized cost effectively on large scales through simple solutionbased processes. As a result, the MLHPs have been investigated for optoelectronic applications in photovoltaics, light-emitting diodes, laser devices, and photodetectors. Recently, the lead halide hybrid organic-inorganic perovskites (HOIPs) have been emerging as a new territory of photovoltaic materials. The HOIPs comprise earth-abundant elements, and yet, exhibit outstanding semiconducting and light-absorption properties. [15,16] In particular, the power-conversion efficiency of HOIP-based devices has surpassed 20% over several years of research and development. [17,18] The HOIPs have a large structural diversity. When the A-site is only occupied by small organic cations (typically methylammonium, MA), they ideally exhibit 3D structures in an octahedral coordination.More interestingly, the HOIPs can exist in layered structures, or 2Ds. 2D HOIPs with unique layered structures are constructed from alternately stacked molecular sheets of organic cations and inorganic anions, as illustrated in Figure 1. The stacking sheets in 2D HOIPs can be regarded as a multiquantum-well structure in semiconductor physics, greatly enhancing the quantum and/or dielectric confinements. As a result, the free charge carriers (electrons or holes) can be strongly confined in atomic-thickness layers, readily forming excitons, which can be treated theoretically as hydrogen-like quasi-particles but moving in 2Ds. As a result, NLO effects can be greatly enhanced along with strong exciton-photon coupling. [19][20][21][22] 2D perovskites have opened up a new opportunity for both fundamental research and practical applications in ultrathin and flexible optoelectronics devices.Moreover, perovskites can also be synthesized into various lower-dimensional structures such as nanocrystals with controllable shapes and sizes. [11,23,24] This allows ones to modulate the quantum confinement effect in the lower-dimensional structures to achieve desirable light-to-electrical conversion, light-emitting, lasing, photodetecting, and NLO properties for various optoelectronic applications.Recently, there have been intensive and extensive research works on perovskites because of their excellent electrical and optical properties. This review is focused on their multiphoton absorption (MPA) and applications. All the MPA coefficients or cross-sections reported in the ...

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Section: Three-photon Absorption (3pa) In 3d Perovskite Crystals and Filmsmentioning

confidence: 99%

Section: Three-photon Absorption (3pa) In 3d Perovskite Crystals and Filmsmentioning

confidence: 99%

Perovskites: Multiphoton Absorption and Applications

Zhou

Ran

Fan

et al. 2021

Advanced Optical Materials

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“…1 Depending on the material and excitation wavelength, MPA coefficients known from the literature can vary by several orders of magnitude (for β 3 values see, for example, Ref. 16,17 ). The coefficients determined by us through this indirect method are within these accepted ranges.…”

Section: Discussionmentioning

confidence: 99%

Scaling laws of subpicosecond laser-induced breakdown in dielectric films (Poster Award Paper)

Mero

Liu

Rudolph

2004

High-Power Laser Ablation V

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The scaling of the laser fluence for dielectric breakdown with respect to pulse duration and material bandgap was investigated in the sub-ps regime using various oxide films (TiO 2 , Ta 2 O 5 , HfO 2 , Al 2 O 3 , and SiO 2 ). A phenomenological model attributes the pulse duration dependence to the interplay of multiphoton ionization, impact ionization, and sub-ps electron decay out of the conduction band. The observed linear scaling of the breakdown fluence with bandgap, which is nearly independent of the pulse duration, can be explained within the framework of our model by invoking the bandgap dependence of the multi-photon absorption coefficient from Keldysh photoionization theory.

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“…Clearly, our analytical solution agrees well with the numerical simulation. For the 3PA-induced ESA process, the ESA lifetimes and ESA cross-section are of a few picoseconds and usually close to 10 −17 cm 2 , respectively [10,13,20]. It is interesting to note that the difference of effective 3PA coefficients measured in the nanosecond regime and in the femtosecond regime for the same sample could be too large in order of magnitude [12,13].…”

Section: Theorymentioning

confidence: 96%

“…Two-photon-induced ESA has been experimentally and theoretically investigated [14][15][16][17][18][19]. For a 3PA-induced ESA process, observations have been experimentally reported for CdS [13] and SrTiO 3 [20]. However, there is no report in the literature on the unambiguous characterization of 3PA-induced ESA.…”

Section: Introductionmentioning

confidence: 99%

Two-step four-photon absorption

2008

Opt. Express

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We report a theoretical investigation of effective four-photon absorption (4PA) process and propose a two-step 4PA model of three-photon- induced excited-state absorption (ESA). Based on three-level rate-equation theory, we find an analytical result for the effective 4PA coefficient that depends on the three-photon absorption (3PA) cross-section, excited-state photophysical properties, and laser pulse duration. We present the analytical theory of the z-dependent nonlinear transmission for straightforwardly yet unambiguously evaluating the 3PA and effective 4PA coefficients simultaneously.

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Nonlinear transmission, ultrafast relaxation and three-photon absorption in reduced SrTiO3

Cited by 18 publications

References 7 publications

Perovskites: Multiphoton Absorption and Applications

Perovskites: Multiphoton Absorption and Applications

Scaling laws of subpicosecond laser-induced breakdown in dielectric films (Poster Award Paper)

Two-step four-photon absorption

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