Nonlinear Optical Response of Excitons Confined to one Dimension

1987 ◽  
Vol 109 ◽  
Author(s):  
B. I. Greene ◽  
J. Orenstein ◽  
M. Thakur ◽  
D. H. Rapkine
Keyword(s):  
Single Crystals ◽  
Nonlinear Optical ◽  
Transient Absorption ◽  
Wavelength Region ◽  
Nonlinear Optical Response ◽  
One Dimension ◽  
Optical Nonlinearities ◽  
Exciton Resonance ◽  
Absorption Data ◽  
Time Resolved

ABSTRACTWe present femtosecond time-resolved transient absorption data taken on polydiacetylene-pTS single crystals over the entire wavelength region of exciton resonance. Observed optical changes are accounted for by a model which predicts quantitatively the large resonant and nonresonant optical nonlinearities.

scholarly journals Investigations of the Energy Transfer in the Phycobilisome Antenna of Arthrospira platensis Using Femtosecond Spectroscopy

2020 ◽  
Vol 10 (11) ◽  
pp. 4045
Author(s):  
Alexandra Fălămaș ◽  
Sebastian A. Porav ◽  
Valer Tosa
Keyword(s):  
Energy Transfer ◽  
Transient Absorption ◽  
Single Photon ◽  
Global Analysis ◽  
Photon Counting ◽  
Excitation Energy Transfer ◽  
Arthrospira Platensis ◽  
Absorption Data ◽  
Time Resolved ◽  
Photocurrent Amplification

Understanding the energy transfer in phycobilisomes extracted from cyanobacteria can be used for building biomimetic hybrid systems for optimized solar energy collection and photocurrent amplification. In this paper, we applied time-resolved absorption and fluorescence spectroscopy to investigate the ultrafast dynamics in a hemidiscoidal phycobilisome obtained from Arthrospira platensis. We obtained the steady-state and time-resolved optical properties and identified the possible pathways of the excitation energy transfer in the phycobilisome and its components, phycocyanin and allophycocyanin. The transient absorption data were studied using global analysis and revealed the existence of ultrafast kinetics down to 850 fs in the phycobilisome. The fluorescence lifetimes in the nanosecond time-scale assigned to the final emitters in each sample were obtained from the time-correlated single photon counting fluorescence experiments.

Ultrafast and large optical nonlinearity of a TiSe2 saturable absorber in the 2 μm wavelength region

Nanoscale ◽  
2019 ◽  
Vol 11 (46) ◽  
pp. 22277-22285
Author(s):  
Rongfei Wei ◽  
Xiangling Tian ◽  
Lupeng Yang ◽  
Dandan Yang ◽  
Zhijun Ma ◽  
...  
Keyword(s):  
Saturable Absorber ◽  
Nonlinear Optical ◽  
Wavelength Region ◽  
Optical Response ◽  
Optical Nonlinearity ◽  
Nonlinear Optical Response ◽  
Non Equilibrium

It is desirable to achieve significant nonlinear optical response with ultrafast and large optical nonlinearity utilizing common materials. Femtosecond response and large nonlinearity induced by non-equilibrium electrons are investigated.

Nonlinear optical response of excitons confined to one dimension

1987 ◽  
Vol 58 (26) ◽  
pp. 2750-2753 ◽  
Author(s):  
B. I. Greene ◽  
J. Orenstein ◽  
R. R. Millard ◽  
L. R. Williams
Keyword(s):  
Nonlinear Optical ◽  
Optical Response ◽  
Nonlinear Optical Response ◽  
One Dimension

scholarly journals Broadband spatial self-phase modulation and ultrafast response of MXene Ti3C2Tx (T=O, OH or F)

Nanophotonics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 2415-2424 ◽  
Author(s):  
Jie Li ◽  
Zilong Zhang ◽  
Jun Yi ◽  
Lili Miao ◽  
Jing Huang ◽  
...  
Keyword(s):  
Phase Modulation ◽  
Nonlinear Optical ◽  
Transient Absorption ◽  
Optical Response ◽  
Nonlinear Optical Response ◽  
Transient Absorption Spectroscopy ◽  
Superior Performance ◽  
Self Phase Modulation ◽  
New Class ◽  
Femtosecond Transient Absorption

AbstractTwo-dimensional layered materials (2DLM) have become the subject of intensive research in various applications such as electronics, photonics and optoelectronics due to their unique physical properties. As a new class of 2DLM, MXenes have attracted great interest due to their superior performance in a wide variety of applications such as batteries, supercapacitors, catalysts, electronics and optics. Here, we have investigated the broadband spatial self-phase modulation (SSPM) and ultrafast response of the MXene Ti3C2Tx (T=O, OH or F) experimentally. The MXene Ti3C2Tx exhibited the broadband nonlinear optical response via SSPM from 400 nm to ~1 μm under the ultrafast laser excitation, and ultrafast carrier characteristics with an ultrafast recovery time with femtosecond transient absorption spectroscopy. The experimental results have shown that the MXenes have the broadband nonlinear optical response, which can lay a foundation for the application prospect for the MXene-based ultrafast optoelectronic devices.

Nonlinear optical response of As+‐ion implanted GaAs studied using time resolved reflectivity

1996 ◽  
Vol 68 (23) ◽  
pp. 3287-3289 ◽  
Author(s):  
S. Janz ◽  
Usman G. Akano ◽  
Ian V. Mitchell
Keyword(s):  
Nonlinear Optical ◽  
Optical Response ◽  
Nonlinear Optical Response ◽  
Time Resolved ◽  
Ion Implanted

scholarly journals Ultrafast Nonlinear Optical Response and Carrier Dynamics in Layered Gallium Sulfide (GaS) Single-Crystalline Thin Films

2021 ◽  
Vol 8 ◽  
Author(s):  
Haishuang Lu ◽  
Yu Chen ◽  
Kexin Yang ◽  
Yawei Kuang ◽  
Zhongguo Li ◽  
...  
Keyword(s):  
Thin Films ◽  
Nonlinear Absorption ◽  
Nonlinear Optical ◽  
Transient Absorption ◽  
Optical Response ◽  
Carrier Dynamics ◽  
Nonlinear Optical Response ◽  
Saturable Absorption ◽  
Gallium Sulfide ◽  
Femtosecond Transient Absorption

Gallium sulfide (GaS) is a layered metal monochalcogenide semiconductor that has recently garnered considerable attention in various fields. In this study, we investigated the nonlinear absorption characteristics of multilayer β-GaS thin films on sapphire substrate by using femtosecond open-aperture Z-scan method. The β-GaS films exhibit saturable absorption behavior at 532 nm while nonlinear absorption appears under 650 nm excitation. The nonlinear absorption coefficient of β-GaS was determined to be −1.8 × 10–8 m/W and 4.9 × 10–8 m/W at 532 and 650 nm, respectively. The carrier dynamics of β-GaS films was studied via femtosecond transient absorption (TA) measurements. The TA results demonstrated that β-GaS films have broad photo-induced absorption in the visible regime and sub-nanosecond lifetime. Our results indicate that gallium sulfide has large nonlinear optical response and long carrier lifetime, which could be applied in future photonic devices.

scholarly journals Giant Enhancement of Nonlinear Optical Response in Nd:YAG Single Crystals by Embedded Silver Nanoparticles

ACS Omega ◽  
2017 ◽  
Vol 2 (4) ◽  
pp. 1279-1286 ◽  
Author(s):  
Rang Li ◽  
Ningning Dong ◽  
Chen Cheng ◽  
Feng Ren ◽  
René Hübner ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Single Crystals ◽  
Nonlinear Optical ◽  
Optical Response ◽  
Nonlinear Optical Response
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