نتایج جستجو برای: optical photon transport

تعداد نتایج: 593178  

2006
Mitchell C. Begelman

We consider the effects of “photon bubble” shock trains on the vertical structure of radiation pressure-dominated accretion disks. These density inhomogeneities are expected to develop spontaneously in radiation-dominated accretion disks where magnetic pressure exceeds gas pressure, even in the presence of magnetorotational instability (MRI). They increase the rate at which radiation escapes fr...

Journal: :Optics letters 2015
Xiaorun Zang Philippe Lalanne

Light transport in periodic waveguides coupled to two-level atoms is investigated theoretically. By using optical Bloch equations and a photonic modal formalism, we derive a convenient semi-analytical expression for calculating the scattering matrix of single atoms trapped in periodic waveguides. The expression that holds for both photonic and plasmonic waveguides represents a basic building bl...

Journal: :Physical review letters 2006
Fredrik Jonsson Christos Flytzanis

We show that the inclusion of nonlocality in the constitutive relations in photonic structures has important repercussions in their eigenmode configuration and distribution. In the case of optical activity, the primary manifestation of nonlocality, these features are traced to a photospin-orbit interaction analogous to the electron spin-orbit interaction in asymmetric semiconducting compounds; ...

Hamid Faezinia, Mahdi zavvari

Graphene based optical devices are highly recommended and interested for integrated optical circuits. As a main component of an optical link, a photodetector based on graphene nano-ribbons is proposed and studied. A quantum transport model is presented for simulation of a graphene nano-ribbon (GNR) -based photo-transistor based on non-equilibrium Green’s function method. In the proposed model a...

Journal: :Physical review letters 2016
Janne Ruostekoski Juha Javanainen

We analyze the emergence of correlated optical phenomena in the transmission of light through a waveguide that confines classical or ultracold quantum degenerate atomic ensembles. The conditions of the correlated collective response are identified in terms of atom density, thermal broadening, and photon losses by using stochastic Monte Carlo simulations and transfer matrix methods of transport ...

Journal: :Medical physics 2013
Gavin G Poludniowski Philip M Evans

PURPOSE Monte Carlo methods based on the Boltzmann transport equation (BTE) have previously been used to model light transport in powdered-phosphor scintillator screens. Physically motivated guesses or, alternatively, the complexities of Mie theory have been used by some authors to provide the necessary inputs of transport parameters. The purpose of Part II of this work is to: (i) validate pred...

2011
J True Merrill Curtis Volin David Landgren Jason M Amini Kenneth Wright S Charles Doret C -S Pai Harley Hayden Tyler Killian Daniel Faircloth Kenneth R Brown Alexa W Harter Richart E Slusher

Efficient collection of trapped ion fluorescence is critical for high-fidelity qubit detection and ion-photon logical interconnects in ion trap quantum information processing. The expected size of future many-ion processors place scalability requirements for high efficiency optical collection systems. We report the development and testing of a microfabricated planar ion trap with an integrated ...

Journal: :Physical review letters 2012
Max Ludwig Amir H Safavi-Naeini Oskar Painter Florian Marquardt

In cavity optomechanics, nanomechanical motion couples to a localized optical mode. The regime of single-photon strong coupling is reached when the optical shift induced by a single phonon becomes comparable to the cavity linewidth. We consider a setup in this regime comprising two optical modes and one mechanical mode. For mechanical frequencies nearly resonant to the optical level splitting, ...

2002
Kenneth W. Dunn Ruben M. Sandoval Katherine J. Kelly Pierre C. Dagher George A. Tanner Simon J. Atkinson Robert L. Bacallao Bruce A. Molitoris

Optical microscopy, when applied to living animals, provides a powerful means of studying cell biology in the most physiologically relevant setting. The ability of 2-photon microscopy to collect optical sections deep into biological tissues has opened up the field of intravital microscopy to highresolution studies of the brain, lens, skin and tumors. Here we present examples of how 2-photon mic...

2002
Kenneth W. Dunn Ruben M. Sandoval Katherine J. Kelly Pierre C. Dagher George A. Tanner Simon J. Atkinson Robert L. Bacallao Bruce A. Molitoris

Optical microscopy, when applied to living animals, provides a powerful means of studying cell biology in the most physiologically relevant setting. The ability of 2-photon microscopy to collect optical sections deep into biological tissues has opened up the field of intravital microscopy to highresolution studies of the brain, lens, skin and tumors. Here we present examples of how 2-photon mic...

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