Results 41 to 50 of about 379,398 (143)

Ultrafast optical nonlinearity in quasi-one-dimensional Mott-insulator ${\rm Sr_2CuO_3}$

, 2000
We report strong instantaneous photoinduced absorption (PA) in the quasi-one-dimensional Mott insulator ${\rm Sr_2CuO_3}$ in the IR spectral region. The observed PA is to an even-parity two-photon state that occurs immediately above the absorption edge ...
A. Keren, A. Mathy, A. Shukla, B. Lawrence, E. W. Van Stryland, G. I. Stegeman, H. Eisaki, H. Ghosh, H. Suzuura, J. Zaanen, K. Matsuda, K. Matsuda, M. Ashida, M. Chandross, M. Imada, M. Kuwata-Gonokami, N. Motoyama, N. Motoyama, R. W. Boyd, S. Mazumdar, S. Uchida, Shigeru Nakamura, T. Ogasawara, Y. Tokura   +23 more
core   +1 more source

Defect state enhanced nonlinear absorption and optical limiting behaviour of erbium doped silver molybdate nanostructures

Scientific Reports
Transition metal based optical limiting materials have garnered significant attention due their crucial role in protecting sensitive optical system from high intense laser damage.
B. Binish, K. Mani Rahulan, T. C. Sabari Girisun, Nisha S. Panicker   +3 more
doaj   +1 more source

Electronic coupling mechanisms and characteristics for optically nonlinear photoactive nanomaterials [PDF]

, 2004
In a range of nanophotonic energy harvesting materials, resonance energy transfer (RET) is the mechanism for the intermolecular and intramolecular transfer of electronic excitation following the absorption of ultraviolet/visible radiation.
Andrews, David, Bradshaw, D.S.
core   +1 more source

Calculation of divergent photon absorption in ultrathin films of a topological insulator

, 2013
We perform linear and non-linear photon absorption calculations in topological insulator ultra-thin films on a substrate. Due to the unique band structure of the coupled topological surface states, novel features are observed for suitable photon ...
Mabuchi, Hideo, Qi, Xiao-Liang, Wang, Jing   +2 more
core   +1 more source

Frequency-Domain Coherent Control of Femtosecond Two-Photon Absorption: Intermediate-Field vs. Weak-Field Regime [PDF]

, 2007
Coherent control of femtosecond two-photon absorption in the intermediate-field regime is analyzed in detail in the powerful frequency domain using an extended 4th-order perturbative description.
Andrey Gandman, Gandman A Chuntonov L Rybak L Amitay Z, Leonid Rybak, Lev Chuntonov, Shapiro M, Zohar Amitay   +5 more
core   +1 more source

The convolution theorem for nonlinear optics

, 2007
We have expressed the nonlinear optical absorption of a semiconductor in terms of its linear spectrum. We determined that the two-photon absorption coefficient in a strong DC-electric field of a direct gap semiconductor can be expressed as the product of
Franz W., Hernando Garcia, Keldysh L., Ramki Kalyanaraman   +3 more
core   +1 more source

Enhancing entangled two-photon absorption of Nile Red via temperature-controlled SPDC

APL Quantum
Entangled two-photon absorption can enable linear scaling of fluorescence emission with the excitation power. In comparison with classical two-photon absorption with quadratic scaling, this can allow fluorescence imaging or photolithography with a high ...
Aleksa Krstić, Tobias Bernd Gäbler, Nitish Jain, Patrick Then, Valerio Flavio Gili, Sina Saravi, Frank Setzpfandt, Christian Eggeling, Markus Gräfe   +8 more
doaj   +1 more source

New Fluorescent Porphyrins with High Two-Photon Absorption Cross-Sections Designed for Oxygen-Sensitization: Impact of Changing the Connectors in the Peripheral Arms

Photochem, 2023
In the continuation of our sustained interest in porphyrin-based dendrimers and their use as luminescent photosensitizers for two-photon photodynamic therapy (2P-PDT), we wondered about the effect of changing the connectors in our macromolecular ...
Limiao Shi, Zhipeng Sun, Nicolas Richy, Olivier Mongin, Mireille Blanchard-Desce, Frédéric Paul, Christine O. Paul-Roth   +6 more
doaj   +1 more source

On-demand single-photon state generation via nonlinear absorption

, 2004
We propose a method for producing on-demand single-photon states based on collision-induced exchanges of photons and unbalanced linear absorption between two single-mode light fields.
A. Beveratos, C. H. Bennett, D. E. Walls, Makoto Yamashita, Michael W. Jack, Tao Hong   +5 more
core   +1 more source

A novel approach towards two-photon absorption based detectors [PDF]

, 2003
Summary: We have demonstrated that the inherent inefficiency of the TPA process in semiconductors can be overcome by incorporating the semiconductor in a microcavity structure.
Barry, Liam P., Bradley, Ann Louise, Donegan, John Francis, Folliot, H., Hill, G., Krug, T., Lynch, Michael, Roberts, J.S.   +7 more
core   +1 more source