scholarly journals Two-Photon-Induced Blue Shift of Core and Shell Optical Transitions in Colloidal CdSe/CdS Quasi-Type II Quantum Rods

ACS Nano ◽  
2013 ◽  
Vol 7 (3) ◽  
pp. 2443-2452 ◽  
Author(s):  
Marco Allione ◽  
Ana Ballester ◽  
Hongbo Li ◽  
Alberto Comin ◽  
José L. Movilla ◽  
...  
Keyword(s):  
Blue Shift ◽  
Type Ii ◽  
Optical Transitions ◽  
Two Photon ◽  
Quantum Rods

scholarly journals Two-photon activated precision molecular photosensitizer targeting mitochondria

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Inês F. A. Mariz ◽  
Sandra N. Pinto ◽  
Ana M. Santiago ◽  
José M. G. Martinho ◽  
Javier Recio ◽  
...  
Keyword(s):  
Anticancer Agents ◽  
Near Infrared ◽  
Therapeutic Potential ◽  
Blue Shift ◽  
Specific Cell ◽  
Animal Cells ◽  
Mitochondrial Potential ◽  
Live Animal ◽  
Two Photon ◽  
Mitochondria Targeting

AbstractMitochondria metabolism is an emergent target for the development of novel anticancer agents. It is amply recognized that strategies that allow for modulation of mitochondrial function in specific cell populations need to be developed for the therapeutic potential of mitochondria-targeting agents to become a reality in the clinic. In this work, we report dipolar and quadrupolar quinolizinium and benzimidazolium cations that show mitochondria targeting ability and localized light-induced mitochondria damage in live animal cells. Some of the dyes induce a very efficient disruption of mitochondrial potential and subsequent cell death under two-photon excitation in the Near-infrared (NIR) opening up possible applications of azonia/azolium aromatic heterocycles as precision photosensitizers. The dipolar compounds could be excited in the NIR due to a high two-photon brightness while exhibiting emission in the red part of the visible spectra (600–700 nm). Interaction with the mitochondria leads to an unexpected blue-shift of the emission of the far-red emitting compounds, which we assign to emission from the locally excited state. Interaction and possibly aggregation at the mitochondria prevents access to the intramolecular charge transfer state responsible for far-red emission.

scholarly journals Межзонный двухфотонный линейно-циркулярный дихроизм в полупроводниках в приближении Кейна

2022 ◽  
Vol 56 (1) ◽  
pp. 61
Author(s):  
В.Р. Расулов ◽  
Р.Я. Расулов ◽  
Б.Б. Ахмедов ◽  
И.А. Муминов
Keyword(s):  
Circular Dichroism ◽  
Photon Absorption ◽  
Degree Of Polarization ◽  
Optical Transitions ◽  
Narrow Gap ◽  
Two Photon Absorption ◽  
Narrow Gap Semiconductors ◽  
Two Photon ◽  
Absorption Of Light ◽  
Circular Dichroïsm

Interband two-photon optical transitions are classified and expressions are obtained for the matrix elements in a narrow-gap semiconductor depending on the band parameters, degree of polarization, and light frequency. It is shown that the main contribution to two-photon linear-circular dichroism in narrow-gap semiconductors is made by optical transitions proceeding from the subband of light holes to the conduction band. The dependences of the partial coefficients of interband two-photon absorption of light, which differ from each other by the types of optical transitions, are analyzed depending on the degree of polarization of the light, and a quantitative analysis of the coefficient of linear-circular dichroism of two-photon absorption of light is carried out. Expressions are obtained for the spectral dependence of the coefficient of interband two-photon absorption of light in narrow-gap semiconductors in the Kane model.

High-visibility two-photon interference in femtosecond pulse pumped type-II SPDC

2003 ◽  
pp. 503-504
Author(s):  
Yoon-Ho Kim ◽  
Maria V. Chekhova ◽  
Sergei P. Kulik ◽  
Morton H. Rubin ◽  
Yanhua Shih
Keyword(s):  
Femtosecond Pulse ◽  
Type Ii ◽  
Two Photon

TEMPERATURE DEPENDENCE OF PHOTOLUMINESCENCE OF FLAT AND UNDULATED SiGe/Si MULTIPLE QUANTUM WELLS

2002 ◽  
Vol 16 (28n29) ◽  
pp. 4211-4214 ◽  
Author(s):  
B. W. CHENG ◽  
J. G. ZHANG ◽  
Y. H. ZUO ◽  
R. W. MAO ◽  
C. J. HUANG ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Quantum Wells ◽  
Blue Shift ◽  
Band Alignment ◽  
Multiple Quantum Wells ◽  
Luminescence Spectra ◽  
Multiple Quantum ◽  
Type Ii ◽  
Thermally Activated ◽  
Strained Sige

Photoluminescence (PL) of strained SiGe/Si multiple quantum wells (MQW) with flat and undulated SiGe well layers was studied at different temperature. With elevated temperature from 10K, the no-phonon (NP) peak of the SiGe layers in the flat samples has firstly a blue shift due to the dominant transition converting from bound excitons (BE) to free excitons (FE), and then has a red shift when the temperature is higher than 30K because of the narrowing of the band gap. In the undulated sample, however, monotonous blue shift was observed as the temperature was elevated from 10 K to 287 K. The thermally activated electrons, confined in Si due to type-II band alignment, leak into the SiGe crest regions, and the leakage is enhanced with the elevated temperature. It results in a blue shift of the SiGe luminescence spectra.

Electronic states and intraband terahertz optical transitions in InGaAs quantum rods

2012 ◽  
Vol 111 (7) ◽  
pp. 073110 ◽  
Author(s):  
Nikola Prodanović ◽  
Nenad Vukmirović ◽  
Dragan Indjin ◽  
Zoran Ikonić ◽  
Paul Harrison
Keyword(s):  
Electronic States ◽  
Optical Transitions ◽  
Quantum Rods

TWO-PHOTON HIGH-DIMENSIONAL SPATIAL ENTANGLEMENT: THEORY AND EXPERIMENT

2006 ◽  
Vol 20 (01) ◽  
pp. 1-23 ◽  
Author(s):  
LEONARDO NEVES ◽  
G. LIMA ◽  
J. G. AGUIRRE GÓMEZ ◽  
C. H. MONKEN ◽  
C. SAAVEDRA ◽  
...  
Keyword(s):  
Quantum Systems ◽  
High Dimensional ◽  
Entangled States ◽  
Type Ii ◽  
Opaque Screen ◽  
Two Photon ◽  
Parametric Down Conversion ◽  
Experimental Works ◽  
Maximally Entangled States ◽  
Down Conversion

We review recent theoretical and experimental works where are proposed and demonstrated how to use photon pairs created by spontaneous parametric down-conversion to generate entangled states of D-dimensional quantum systems, or qudits. This is the first demonstration of high-dimensional entanglement based on the intrinsic transverse momentum entanglement of the type-II down-converted photons. The qudit space is defined by an aperture made up of an opaque screen with D slits (paths), placed in the arms of the twin photons. By manipulating the pump beam profile we can prepare different entangled states of these possible paths. We focus our attention on an important case for applications in quantum information: the maximally entangled states. Experimental results for qudits with D=4 and D=8 are shown and measuring a two-photon conditional interference, we also demonstrate the nonclassical character of the correlations.

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