By means of two-photon excited photoluminescence, we demonstrate the influence of self-absorption on the emission properties of thin (1.5 microm) film CdS formed by laser ablation. The excitation of the sample is performed with 200 fs pulses at 804 nm (1.54 eV). The photoluminescence spectrum takes the form of a single peak centered at 510 nm (2.43 eV) at 300 K. The spectrum is shifted about 45...

The chapter focuses on positron emission tomography (PET), a medical imaging technique that combines high speed with high complexity data processing. In PET, optical sensors detect gamma events generated by the annihilation of an electron and a positron, by measuring hundreds of individual photon times-ofarrival. These measurements are carefully analyzed, every 6.4 ls, by ultra-fast networks an...

Sources of single photons are key elements for applications in quantum information science. Among the different sources available, semiconductor quantum dots excel with their integrability in semiconductor on-chip solutions and the potential that photon emission can be triggered on demand. Usually, the photon is emitted from a single-exciton ground state. Polarization of the photon and time of ...

conclusions gated spect mpi has a good correlation with echocardiography for the measurement of left ventricular ef, edv, and esv in patients with severe heart failure. however, the absolute values of these functional parameters from echocardiography and gated spect mpi measured with different software packages should not be used interchangeably. results a good correlation was found between ech...

The quadrupole channel of two-photon double ionization of He exhibits two distinctly different modes of correlated motion of the photoelectron pair. The kinematics of the mode associated with the center-of-mass motion favors large total momenta maximized at parallel emission where the interelectron repulsion is strong. In contrast, the mode associated with the relative motion favors large relat...

We investigate the single-photon transport properties of a one-dimensional coupled cavity array (CCA) containing a single qubit in its central site by coupling the CCA to two transmission lines supporting propagating bosonic modes with linear dispersion. We find that even in the nominally weak light-matter coupling regime, the transmission through a long array exhibits two ultra-narrow resonanc...

All living organisms emit spontaneous ultraweak photon emission as a result of cellular metabolic processes. In this study, the involvement of reactive oxygen species (ROS) formed as the byproduct of oxidative metabolic processes in spontaneous ultraweak photon emission was studied in human hand skin. The effect of molecular oxygen and ROS scavengers on spontaneous ultraweak photon emission fro...

We analyze the end-point region of the photon spectrum in semi-inclusive radiative decays of very heavy quarkonium (mαs ≫ ΛQCD). We discuss the interplay of the scales arising in the Soft-Collinear Effective Theory, m, m(1 − z) and m(1 − z) for z close to 1, with the scales of heavy quarkonium systems in the weak coupling regime, m, mαs and mα 2 s . For 1 − z ∼ αs only collinear and (ultra)soft...

Intense ultranarrow resonances have been observed in the photoionization of Mg from the singly-excited 3smd D (m=3,4,5,6) states to the doubly-excited 3png F (n=5,6,7) autoionization states using stepwise laser excitation and timeof-ßight mass spectrometry detection. The reported experimental energy resolution at an order of 10−7 of the photon energy represents a considerable improvement over t...