One- and Two-Photon Absorption in CdS Nanodots and Wires: The Role of Dimensionality in the One- and Two-Photon Luminescence Excitation Spectrum

2014 ◽  
Vol 119 (2) ◽  
pp. 1260-1267 ◽  
Author(s):  
Alexander W. Achtstein ◽  
Ana Ballester ◽  
Jose L. Movilla ◽  
Jonas Hennig ◽  
Juan I. Climente ◽  
...  
Keyword(s):  
Excitation Spectrum ◽  
Luminescence Excitation Spectrum ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
The One

Theoretical Investigation on the One- and Two-photon Absorption Properties of Porphyrin-thiophene Chromophores

2009 ◽  
Vol 27 (7) ◽  
pp. 1269-1279 ◽  
Author(s):  
Wenchao LI ◽  
Jikang FENG ◽  
Aimin REN ◽  
Xiangbiao ZHANG ◽  
Chiachung SUN
Keyword(s):  
Theoretical Investigation ◽  
Photon Absorption ◽  
Absorption Properties ◽  
Two Photon Absorption ◽  
Two Photon ◽  
The One

Theoretical studies on the one- and two-photon absorption of tetrabenzoporphyrins and phthalocyanines

2004 ◽  
Vol 82 (1) ◽  
pp. 19-26 ◽  
Author(s):  
Xin Zhou ◽  
Ai-Min Ren ◽  
Ji-Kang Feng ◽  
Xiao-Juan Liu
Keyword(s):  
Dipole Moment ◽  
Cross Sections ◽  
Density Functional ◽  
Transition Dipole Moment ◽  
Photon Absorption ◽  
Transition Dipole ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Order Of Magnitude ◽  
The One

The one-photon absorption (OPA) properties of tetrabenzoporphyrins (TBPs) and phthalocyanines (Pcs) were studied using the semiempirical ZINDO method and time-dependent density functional theory (TDDFT), respectively. The compared results confirmed that the semiempirical ZINDO method was reasonably reliable when calculating the OPA of tetrabenzoporphyrins and phthalocyanines. On the basis of the OPA properties obtained from the ZINDO method, two-photon absorption (TPA) properties of two series of molecules were investigated, using ZINDO and sum-over-states (SOS) methods. The results showed that the TPA cross-sections of all molecules were in the range of 220.6 × 10–50 – 345.9 × 10–50 cm4·s·photon–1, which were in the same order of magnitude as the values reported in the literature. The relatively larger δ(ω) value for Pcs with respect to that for corresponding TBPs originates from larger intramolecular charge transfer, which can be characterized by the difference of dipole moment between S0 and S1 and the transition dipole moment between S1 and S5.Key words: two-photon absorption, ZINDO, sum-over-states, tetrabenzoporphyrin, phthalocyanines.

OPTICAL LIMITING STUDIES IN PHOTOREFRACTIVE PURE AND IRON-DOPED Bi12SiO20 CRYSTALS

2000 ◽  
Vol 09 (02) ◽  
pp. 217-225 ◽  
Author(s):  
P. SREERAMANA AITHAL ◽  
P. PREM KIRAN ◽  
D. NARAYANA RAO
Keyword(s):  
Excited State Absorption ◽  
Optical Limiting ◽  
Photon Absorption ◽  
Limiting Behavior ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Iron Incorporation ◽  
Optical Limiter ◽  
Level Model

Optical limiting characteristics of pure and 150 ppm Fe-doped Bi 12 SiO 20 (BSO:Fe) crystals are studied at high intensity nanosecond pulse regime. When the input light is at 532 nm and at 595 nm with 6 ns pulse duration, a good optical limiting behavior is observed due to simultaneous effect of trap assisted excited state absorption and two photon absorption. The precise role of the internal defects due to impurity centers present in the crystal lattice is explained on the basis of a four level model. This study reveal that the increased nonlinear absorption due to iron incorporation in BSO makes it an excellent passive optical limiter.

Computational study of the one- and two-photon absorption properties of macrocyclic thiophene derivatives

2011 ◽  
Vol 91 (2) ◽  
pp. 248-257 ◽  
Author(s):  
Shuang Huang ◽  
Ai-Min Ren ◽  
Lu-Yi Zou ◽  
Yang Zhao ◽  
Jing-Fu Guo ◽  
...  
Keyword(s):  
Computational Study ◽  
Photon Absorption ◽  
Absorption Properties ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Thiophene Derivatives ◽  
The One

Spectral profiles of two-photon absorption: Coherent versus two-step two-photon absorption

2004 ◽  
Vol 846 ◽  
Author(s):  
S. Polyutov ◽  
I. Minkov ◽  
F. Gel'mukhanov ◽  
K. Kamada ◽  
A. Baev ◽  
...  
Keyword(s):  
Cross Sections ◽  
Degrees Of Freedom ◽  
Photon Absorption ◽  
Final State ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Spectral Bands ◽  
Spectral Profiles ◽  
The One ◽  
Spectral Shapes

ABSTRACTWe present a theory of two-photon absorption in solutions which addresses the formation of spectral shapes taking account of the vibrational degrees of freedom. The theory is used to rationalize observed differences between spectral shapes of one- and two-photon absorption. We elaborate on two underlying causes, one trivial and one non-trivial, behind these differences. The first refers simply to the fact that the set of excited electronic states constituting the spectra will have different relative cross sections for one-and two- photon absorption. The second reason is that the two-step and coherent two-photon absorption processes are competing, making the one-and two-photon spectral bands different even considering a single final state. The theory is applied to the N-101 molecule [di-phenyl-amino-nitro-stilbene] which was recently studied experimentally in the paper [ T.-C. Lin, G.S. He, P.N. Prasad, and L.-S. Tan, J. Mater. Chem., 14, 982, 2004.]

Multiphoton Excitation Studies on GaN with PS Pulses

1996 ◽  
Vol 449 ◽  
Author(s):  
I. H. Libon ◽  
C. Voelkmann ◽  
D. Kim ◽  
V. Petrova-Koch ◽  
Y. R. Shen
Keyword(s):  
Excitation Spectrum ◽  
Photon Absorption ◽  
Multiphoton Excitation ◽  
Defect States ◽  
Sum Frequency ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Theoretical Predictions ◽  
Frequency Excitation ◽  
Two Photon Absorption Coefficient

ABSTRACTWe report the observation of UV photoluminescence (PL) from wurtzite GaN by multiphoton excitation. The dependence of the PL intensity on excitation intensity as well as PL excitation measurements with sub-bandgap photon energies indicate the existence of deep defect states centered at about 1.0 eV above the top of the valence band. This result was confirmed by a sum-frequency excitation spectrum. We correlate these measurements with the omnipresent yellow luminescence in GaN. Our two-photon PL excitation spectrum yields a two-photon absorption coefficient that agrees very well with theoretical predictions.

Transient and steady-state behavior of single and two-photon absorption by microwave driven field

2014 ◽  
Vol 92 (4) ◽  
pp. 284-288
Author(s):  
Seyyed Hossein Asadpour ◽  
H. Rahimpour Soleimani
Keyword(s):  
Steady State ◽  
Microwave Field ◽  
Single Photon ◽  
Photon Absorption ◽  
State Behavior ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Probe Gain ◽  
The One ◽  
Transient And Steady State

In this paper, the effect of microwave field on the transient and steady state response of the four-level inverted Y-type atomic system is investigated. It is found that the properties of transient and steady processes can be affected by microwave field. It is found that the absorption spectrum behaves differentially for single-photon absorption and two-photon absorption. Also it is observed that in the one-photon absorption, the microwave field can lead to the probe gain and for two-photon absorption case, the strong microwave can enhance the absorption.

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