Imaging single molecules by optical absorption at room temperature

2011 ◽  
Author(s):  
Michele Celebrano ◽  
Philipp Kukura ◽  
Alois Renn ◽  
Vahid Sandoghdar
Keyword(s):  
Optical Absorption ◽  
Room Temperature ◽  
Single Molecules

High photo-stability of single molecules in an organic crystal at room temperature observed by scanning confocal optical microscopy

1998 ◽  
Vol 95 (6) ◽  
pp. 1333-1338 ◽  
Author(s):  
LUDOVIC FLEURY ◽  
BEATE SICK ◽  
GERT ZUMOFEN ◽  
BERT HECHT ◽  
URS P. WILD
Keyword(s):  
Optical Microscopy ◽  
Room Temperature ◽  
Single Molecules ◽  
Organic Crystal ◽  
Photo Stability

OPTICAL ABSORPTION AND ESR SPECTRAL STUDIES ON COPPER-DOPED LEAD-CADMIUM GLASSES

2005 ◽  
Vol 19 (03) ◽  
pp. 119-128 ◽  
Author(s):  
M. PRASAD ◽  
M. CHANDRASEKHAR ◽  
V. CHANDRA MOULI
Keyword(s):  
Optical Absorption ◽  
Absorption Spectra ◽  
Room Temperature ◽  
Spectral Studies ◽  
Optical Absorption Spectra ◽  
Prepared Glass ◽  
Spin Resonance ◽  
Spectral Profiles ◽  
Hamiltonian Parameters ◽  
Ligand Bond

The electron spin resonance and optical absorption spectra of PbO-CdO glasses containing 1 mole% CuO have been investigated at room temperature. The optical absorption spectra of all glass samples have exhibited a broad asymmetric absorption band, which corresponds to a d–d transition of Cu 2+ ions. The prepared glass samples have been analyzed as a function of the photon energy. The results are interpreted based on the optical absorption spectral profiles and also the edge values upon the application of Davis and Mott's theory. From the ESR spectral features, the spin Hamiltonian parameters have been evaluated. The bonding coefficients were obtained, in order to elucidate the information on the Cu 2+ ligand bond nature.

scholarly journals Large Negative Photoresistivity in Amorphous NdNiO3 Film

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1411
Author(s):  
Alexandr Stupakov ◽  
Tomas Kocourek ◽  
Natalia Nepomniashchaia ◽  
Marina Tyunina ◽  
Alexandr Dejneka
Keyword(s):  
Energy Density ◽  
Optical Absorption ◽  
Power Density ◽  
Room Temperature ◽  
Amorphous Film ◽  
Amorphous Films ◽  
Metal Insulator ◽  
Wide Range ◽  
Potential Applications

A significant decrease in resistivity by 55% under blue lighting with ~0.4 J·mm−2 energy density is demonstrated in amorphous film of metal-insulator NdNiO3 at room temperature. This large negative photoresistivity contrasts with a small positive photoresistivity of 8% in epitaxial NdNiO3 film under the same illumination conditions. The magnitude of the photoresistivity rises with the increasing power density or decreasing wavelength of light. By combining the analysis of the observed photoresistive effect with optical absorption and the resistivity of the films as a function of temperature, it is shown that photo-stimulated heating determines the photoresistivity in both types of films. Because amorphous films can be easily grown on a wide range of substrates, the demonstrated large photo(thermo)resistivity in such films is attractive for potential applications, e.g., thermal photodetectors and thermistors.

Optical and EPR Study of Defects in Cadmium Germanium Arsenide

2002 ◽  
Vol 744 ◽  
Author(s):  
Lihua Bai ◽  
N. Y. Garces ◽  
Nanying Yang ◽  
P. G. Schunemann ◽  
S. D. Setzler ◽  
...  
Keyword(s):  
Absorption Band ◽  
Optical Absorption ◽  
Room Temperature ◽  
Hole Concentration ◽  
Paramagnetic Defect ◽  
Paramagnetic Resonance ◽  
Anion Site ◽  
Shallow Acceptors ◽  
P Type ◽  
Cadmium Germanium Arsenide

ABSTRACTBulk crystals of CdGeAs2 have been characterized using photoluminescence (PL), optical absorption, Hall effect, and electron paramagnetic resonance (EPR) techniques. An absorption band near 5.5 microns at room temperature is observed in all of the p-type samples we have studied. A correlation between the magnitude of this optical absorption and the excess hole concentration at room temperature is established. Also, an EPR signal is found to correlate with the strength of this absorption band. PL data are consistent with an increased concentration of shallow acceptors being present in high-absorption samples. From the EPR data, we suggest that a model for the paramagnetic defect associated with the absorption at 5.5 microns may be an acceptor on an anion site.

scholarly journals Thermally activated delayed fluorescence vs. room temperature phosphorescence by conformation control of organic single molecules

2019 ◽  
Vol 7 (22) ◽  
pp. 6616-6621 ◽  
Author(s):  
Przemyslaw Data ◽  
Masato Okazaki ◽  
Satoshi Minakata ◽  
Youhei Takeda
Keyword(s):  
Room Temperature ◽  
Single Molecules ◽  
Delayed Fluorescence ◽  
Room Temperature Phosphorescence ◽  
Time Resolved ◽  
Thermally Activated Delayed Fluorescence ◽  
Molecular Conformations ◽  
Thermally Activated ◽  
Luminescent Compound

The time-resolved photophysical analysis of a multi-color-changing mechanochromic luminescent compound has been disclosed, which reveals distinct different emission paths to boost TADF and RTP of the emitter depending on its molecular conformations.

scholarly journals Photothermal Microscopy: Imaging the Optical Absorption of Single Nanoparticles and Single Molecules

ACS Nano ◽  
2020 ◽  
Vol 14 (12) ◽  
pp. 16414-16445
Author(s):  
Subhasis Adhikari ◽  
Patrick Spaeth ◽  
Ashish Kar ◽  
Martin Dieter Baaske ◽  
Saumyakanti Khatua ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Single Molecules ◽  
Microscopy Imaging ◽  
Photothermal Microscopy

Room‐temperature optical absorption in undoped α‐Al2O3

1990 ◽  
Vol 67 (12) ◽  
pp. 7542-7546 ◽  
Author(s):  
M. E. Innocenzi ◽  
R. T. Swimm ◽  
M. Bass ◽  
R. H. French ◽  
A. B. Villaverde ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Room Temperature ◽  
Α Al2o3 ◽  
Room Temperature Optical Absorption

Metastable Percolation Phase Formation in Lif Implanted with Alkali Ions

1981 ◽  
Vol 7 ◽  
Author(s):  
J. Davenas ◽  
P. Thevenard ◽  
C. Dupuy
Keyword(s):  
Low Temperature ◽  
Optical Absorption ◽  
Phase Formation ◽  
Room Temperature ◽  
Critical Concentration ◽  
External Perturbation ◽  
Metallic Layer ◽  
Alkali Ions ◽  
Conducting State ◽  
Equilibrium Situation

ABSTRACTThe formation of a continuous metallic layer in the doped region of LiF crystals implanted at low temperature, has been explained by the formation of bridges between next neighbouring alkali ions of the lattice around-each implanted ion. For a critical concentration of implanted ions it is possible to show using statistical arguments that conducting chains are formed by the union of these links, according to a percolation mechanism. We show that the assumption of a distribution of isolated implanted ions at low temperature is justified by the observation of their precipitation when the crystal is warmed up to room temperature. The transformation of the metallic optical absorption into the colloidal band associated with precipitates of implanted ions is correlated with the transition from a conducting state to an insulating state of the implanted layer. We show that this evolution towards an equilibrium situation may be reversed by a reirradiation, which is used as an external perturbation and that the conducting state associated with dispersed implanted ions is then once again obtained.

Nonlinear optical absorption in bulk GaInAs/InP at room temperature

1987 ◽  
Vol 50 (7) ◽  
pp. 398-400 ◽  
Author(s):  
A. M. Fox ◽  
A. C. Maciel ◽  
J. F. Ryan ◽  
M. D. Scott
Keyword(s):  
Optical Absorption ◽  
Nonlinear Optical ◽  
Room Temperature ◽  
Nonlinear Optical Absorption
Sign in / Sign up

Export Citation Format

Share Document