The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We investigate coherent excitonic coupling in asymmetric double quantum wells with varying barrier thickness using optical two-dimensional Fourier transform spectroscopy. The coupling is isolated and characterized as cross peaks in two-dimensional spectra.
Femtosecond time-resolved photoelectron spectroscopy has been used to measure the electron-phonon coupling constant of free size selected Nan+ (n=16-250) clusters. The extrapolated electron-phonon coupling constant of bulk sodium is gB sime 2:3 times 1016 W/m3K.
We report the experimental observation of EIT in Cs2 in Lambda configuration. The width of EIT is smaller than widths of molecular transitions and has different dependence on temperature. Application to quantum storage is discussed.
The noncentrosymmetric molecular structures responsible for the second order nonlinear effects of collagen fibrils are identified by sum frequency vibrational spectroscopy. CH2 and C=O functional groups dominate the achiral and chiral spectra, respectively.
Using terahertz magneto-photoconductive spectroscopy, we investigate impurity migration effects in barrier-doped GaAs/AlGaAs quantum wells. A new segregation decay rate for Si impurities in AlGaAs is determined for samples fabricated at low epitaxial growth temperature.
The magnetic field orientation dependence of the terahertz radiation intensity from GaAs/AlGaAs modulation-doped structures with varying spacer thickness was investigated. Results are analyzed in the context of junction electric field, carrier mobility, and interface roughness.
High-resolution spectroscopy at 125 nm is performed on xenon, using amplified frequency comb pulse trains that are upconverted in a gas cell. This technique enables spectroscopy with sub-MHz accuracy in the vacuum-ultraviolet.
We present a maximum-likelihood method for determining metallic electron-boson interaction parameters with time-domain terahertz spectroscopy. As an example, we discuss its application to lead, and discuss uncertainties in the resulting parameter estimates.
We used a thermo-electrically cooled, continuous-wave, quantum cascade laser with wavelength modulation spectroscopy for the detection of nitric oxide at sub-part-per-billion volume (ppbv) . The minimal detectable absorption achieved is 9 times 10-9 cm-1Hz-frac12.
Utilizing terahertz time domain spectroscopy, we characterized the electromagnetic response of planar split ring resonators fabricated on GaAs. Optical excitation is sufficient to turn off the electric resonance demonstrating the potential of SRR terahertz switches.
The dynamics of an ensemble of cold excitons created by two-photon resonant excitation is examined by mid-infrared pump-probe spectroscopy. Lyman transitions from the 1s to n-p states of ortho and para-excitons are probed in Cu2O.
We studied excited states of excitons and biexcitons in CuCl quantum dots by infrared transient absorption measurement. We successfully obtained their absorption spectra clearly to discuss the specific excited states of the confined biexcitons.
We present a newly developed photothermal imaging technique to perform absorption spectroscopy of individual nano-objects. Intrinsic size effects in the surface plasmon resonance of gold nanoparticles and CdSe/ZnS nanocrystals in the multiexcitonic regime are studied.
XUV harmonics are used to study the photoelectron spectrum of O2. The autoionization states of O2 are further investigated using XUV harmonic as pump and IR laser as probe.
Using THz time-domain and FTIR spectroscopy we measure the far-infrared absorption spectra of various biomolecular crystals with different numbers of hydrogen bonds of different strengths. The experimental data are compared to density functional theory calculations.
We performed THz time-domain attenuated total reflection spectroscopy of arginine and sucrose solution, and verified that this method gives us reasonable hydration numbers.
The 2D THz photonic bandgap structures are fabricated of cured SU-8, and installed in single mode metal parallel plate waveguides. The structures are characterized by THz time-domain spectroscopy. The experimental measurements agree with theoretical predictions.
An elliptically polarized absorption quantum-beat spectroscopy is developed and used to observe electron-spin coherence relaxation in an intrinsic bulk GaAs in Voigt geometry. The temperature dependence of electron-spin coherence lifetime is first obtained.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.