Ultrafast bulk carrier dynamics in various GaN crystals at near-infrared wavelengths under one- and two-photon absorption

2019 ◽  
Vol 114 (11) ◽  
pp. 112108 ◽  
Author(s):  
Yu Fang ◽  
Junyi Yang ◽  
Zhengguo Xiao ◽  
Xingzhi Wu ◽  
Jidong Jia ◽  
...  
Keyword(s):  
Near Infrared ◽  
Carrier Dynamics ◽  
Photon Absorption ◽  
Bulk Carrier ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Infrared Wavelengths

Two-photon absorption spectra of a near-infrared 2-azaazulene polymethine dye: solvation and ground-state symmetry breaking

2013 ◽  
Vol 15 (20) ◽  
pp. 7666 ◽  
Author(s):  
Honghua Hu ◽  
Olga V. Przhonska ◽  
Francesca Terenziani ◽  
Anna Painelli ◽  
Dmitry Fishman ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Absorption Spectra ◽  
Ground State ◽  
Near Infrared ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Polymethine Dye

scholarly journals Polyfluorenylacetylene for near-infrared laser protection: polymer synthesis, optical limiting mechanism and relationship between molecular structure and properties

RSC Advances ◽  
2017 ◽  
Vol 7 (85) ◽  
pp. 53785-53796 ◽  
Author(s):  
Gang Zhao ◽  
Yan Feng ◽  
Shanyi Guang ◽  
Hongyao Xu ◽  
Naibo Lin ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Near Infrared ◽  
Optical Limiting ◽  
High Thermal Stability ◽  
Photon Absorption ◽  
Structure And Properties ◽  
Absorption Mechanism ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Good Solubility

The incorporation of styryl/stilbene–fluorene into polyacetylenes not only endowed the polymers with novel near-infrared optical limiting properties based on a two-photon absorption mechanism but good solubility and high thermal stability.

scholarly journals Two-photon excited deep-red and near-infrared emissive organic co-crystals

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Yu Wang ◽  
Huang Wu ◽  
Penghao Li ◽  
Su Chen ◽  
Leighton O. Jones ◽  
...  
Keyword(s):  
Cross Sections ◽  
Optical Materials ◽  
Near Infrared ◽  
Infrared Emission ◽  
Photon Absorption ◽  
Electromagnetic Spectrum ◽  
Absorption Bands ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Near Infrared Emission

Abstract Two-photon excited near-infrared fluorescence materials have garnered considerable attention because of their superior optical penetration, higher spatial resolution, and lower optical scattering compared with other optical materials. Herein, a convenient and efficient supramolecular approach is used to synthesize a two-photon excited near-infrared emissive co-crystalline material. A naphthalenediimide-based triangular macrocycle and coronene form selectively two co-crystals. The triangle-shaped co-crystal emits deep-red fluorescence, while the quadrangle-shaped co-crystal displays deep-red and near-infrared emission centered on 668 nm, which represents a 162 nm red-shift compared with its precursors. Benefiting from intermolecular charge transfer interactions, the two co-crystals possess higher calculated two-photon absorption cross-sections than those of their individual constituents. Their two-photon absorption bands reach into the NIR-II region of the electromagnetic spectrum. The quadrangle-shaped co-crystal constitutes a unique material that exhibits two-photon absorption and near-infrared emission simultaneously. This co-crystallization strategy holds considerable promise for the future design and synthesis of more advanced optical materials.

Nondegenerate and degenerate two-photon absorption in cuprous oxide thin film

2019 ◽  
Vol 28 (02) ◽  
pp. 1950015 ◽  
Author(s):  
Huijun Liang ◽  
Qunchao Ma ◽  
Jian Liu ◽  
Xinwei Shi ◽  
Gongjin Yang ◽  
...  
Keyword(s):  
Thin Film ◽  
Cuprous Oxide ◽  
Near Infrared ◽  
Rf Magnetron Sputtering ◽  
Photonic Devices ◽  
Photon Absorption ◽  
Oxide Thin Film ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Nir Absorption

A cuprous oxide (Cu2O) thin film was prepared by radio-frequency (RF) magnetron sputtering. The crystal structure, linear transmission spectrum and film thickness were characterized by X-ray diffraction (XRD), ultraviolet–visible–near infrared (UV–Vis–NIR) absorption spectroscopy and ellipsometry. By performing the pump-probe and [Formula: see text]-scan technique, respectively, nondegenerate and degenerate two-photon absorption (D-TPA) coefficients of the Cu2O thin film at several different excitation wavelengths were experimentally determined. The nondegenerate two-photon absorption (ND-TPA) coefficient always exhibits larger magnitude than the corresponding D-TPA coefficient. In particular, the ND-TPA coefficient shows a maximum value of [Formula: see text][Formula: see text]cm/GW. This study indicates that the cuprous oxide could be a potential material for ultrafast nonlinear photonic devices based on two-photon absorption due to its large ND-TPA coefficient.

scholarly journals Highly efficient singlet oxygen generation, two-photon photodynamic therapy and melanoma ablation by rationally designed mitochondria-specific near-infrared AIEgens

2020 ◽  
Vol 11 (9) ◽  
pp. 2494-2503 ◽  
Author(s):  
Zheng Zheng ◽  
Haixiang Liu ◽  
Shaodong Zhai ◽  
Haoke Zhang ◽  
Guogang Shan ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Singlet Oxygen ◽  
Near Infrared ◽  
Molecular Engineering ◽  
Photon Absorption ◽  
Oxygen Generation ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Singlet Oxygen Generation ◽  
Highly Efficient

Mitochondria-targeted photosensitizers with highly efficient singlet oxygen generation, bright near-infrared AIE and good two-photon absorption are obtained through ingenious molecular engineering for cancer cell-selective photodynamic therapy.

scholarly journals Ultrafast sub–30-fs all-optical switching based on gallium phosphide

2019 ◽  
Vol 5 (6) ◽  
pp. eaaw3262 ◽  
Author(s):  
Gustavo Grinblat ◽  
Michael P. Nielsen ◽  
Paul Dichtl ◽  
Yi Li ◽  
Rupert F. Oulton ◽  
...  
Keyword(s):  
Gallium Phosphide ◽  
Optical Switching ◽  
Near Infrared ◽  
Optical Nonlinearity ◽  
Photon Absorption ◽  
Linear Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
All Optical ◽  
All Optical Switching

Gallium phosphide (GaP) is one of the few available materials with strong optical nonlinearity and negligible losses in the visible (λ > 450 nm) and near-infrared regime. In this work, we demonstrate that a GaP film can generate sub–30-fs (full width at half maximum) transmission modulation of up to ~70% in the 600- to 1000-nm wavelength range. Nonlinear simulations using parameters measured by theZ-scan approach indicate that the transmission modulation arises from the optical Kerr effect and two-photon absorption. Because of the absence of linear absorption, no slower free-carrier contribution is detected. These findings place GaP as a promising ultrafast material for all-optical switching at modulation speeds of up to 20 THz.

scholarly journals Two-photon absorption in penicillamine capped CdS tetrapods

2017 ◽  
Vol 5 (7) ◽  
pp. 1724-1729 ◽  
Author(s):  
D. Wawrzyńczyk
Keyword(s):  
Wavelength Range ◽  
Near Infrared ◽  
Water Soluble ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Semiconducting Nanoparticles ◽  
Two Photon ◽  
Infrared Excitation

Synthesized penicillamine stabilized CdS tetrapods showed two-photon absorption in a wavelength range between 600 and 850 nm, and strong two-photon excited emission upon near infrared excitation. These water soluble colloidal, semiconducting nanoparticles show potential for applications in nonlinear bioimaging.

Synthesis of a Nickel Bis(dithiolene) Complex with Strong Near-Infrared Two-Photon Absorption

2008 ◽  
Vol 485 (1) ◽  
pp. 915-927 ◽  
Author(s):  
Jian-Yang Cho ◽  
Jie Fu ◽  
Lazaro A. Padilha ◽  
Stephen Barlow ◽  
Eric W. Van Stryland ◽  
...  
Keyword(s):  
Near Infrared ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon

scholarly journals A water soluble probe with near infrared two-photon absorption and polarity-induced fluorescence for cerebral vascular imaging

2013 ◽  
Vol 4 (7) ◽  
pp. 2833 ◽  
Author(s):  
Julien Massin ◽  
Azzam Charaf-Eddin ◽  
Florence Appaix ◽  
Yann Bretonnière ◽  
Denis Jacquemin ◽  
...  
Keyword(s):  
Near Infrared ◽  
Water Soluble ◽  
Vascular Imaging ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Cerebral Vascular
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