scholarly journals Light reflection and transmission in planar lattices of cold atoms

2020 ◽  
Vol 28 (7) ◽  
pp. 9764
Author(s):  
Sung-Mi Yoo ◽  
Juha Javanainen
Keyword(s):  
Cold Atoms ◽  
Light Reflection ◽  
Reflection And Transmission ◽  
Planar Lattices

INDUCED EMISSION OF COLD ATOMS PASSING THROUGH A MICROMASER CAVITY: SPATIAL DEPENDENCE

2002 ◽  
Vol 16 (04) ◽  
pp. 117-125 ◽  
Author(s):  
MAHMOUD ABDEL-ATY ◽  
ABDEL-SHAFY F. OBADA
Keyword(s):  
Cold Atoms ◽  
Center Of Mass ◽  
Cold Atom ◽  
Mass Motion ◽  
Initial State ◽  
Reflection And Transmission ◽  
Field System ◽  
Cavity Profile ◽  
The One ◽  
Atomic Populations

The emission probability of a cold atom in a microcavity when its center-of-mass motion is described quantum mechanically is presented, but is distinguished from other treatments by the inclusion of the spatial variation along the cavity axis. In particular, the mesa mode cavity profile is considered. The quantum theory of the one-photon mazer is constructed in the framework of the dressed-state coordinate formalism. Simple expressions for the atomic populations, the cavity photon statistics, and the reflection and transmission probabilities are given for any initial state of the atom-field system. The general conclusions reached are illustrated by numerical results.

scholarly journals Generalized laws of refraction and reflection at interfaces between different photonic artificial gauge fields

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Moshe-Ishay Cohen ◽  
Christina Jörg ◽  
Yaakov Lumer ◽  
Yonatan Plotnik ◽  
Erik H. Waller ◽  
...  
Keyword(s):  
Acoustic Waves ◽  
Total Internal Reflection ◽  
Cold Atoms ◽  
Imaging System ◽  
Gauge Fields ◽  
Reflection And Transmission ◽  
System A ◽  
Snell Law ◽  
Potential Landscape ◽  
Artificial Gauge Fields

AbstractArtificial gauge fields the control over the dynamics of uncharged particles by engineering the potential landscape such that the particles behave as if effective external fields are acting on them. Recent years have witnessed a growing interest in artificial gauge fields generated either by the geometry or by time-dependent modulation, as they have been enablers of topological phenomena and synthetic dimensions in many physical settings, e.g., photonics, cold atoms, and acoustic waves. Here, we formulate and experimentally demonstrate the generalized laws of refraction and reflection at an interface between two regions with different artificial gauge fields. We use the symmetries in the system to obtain the generalized Snell law for such a gauge interface and solve for reflection and transmission. We identify total internal reflection (TIR) and complete transmission and demonstrate the concept in experiments. In addition, we calculate the artificial magnetic flux at the interface of two regions with different artificial gauge fields and present a method to concatenate several gauge interfaces. As an example, we propose a scheme to make a gauge imaging system—a device that can reconstruct (image) the shape of an arbitrary wavepacket launched from a certain position to a predesigned location.

scholarly journals Numerical analysis of light reflection and transmission in poly-disperse sea fog

2020 ◽  
Vol 28 (17) ◽  
pp. 25410
Author(s):  
Chi Zhang ◽  
Jianqi Zhang ◽  
Xin Wu ◽  
Melin Huang
Keyword(s):  
Numerical Analysis ◽  
Light Reflection ◽  
Reflection And Transmission ◽  
Sea Fog

scholarly journals Light reflection and transmission by a temperate snow cover

2007 ◽  
Vol 53 (181) ◽  
pp. 201-210 ◽  
Author(s):  
Donald K. Perovich
Keyword(s):  
Snow Cover ◽  
Optical Measurements ◽  
Optical Observations ◽  
Light Reflection ◽  
Infrared Transmission ◽  
Snow Layer ◽  
Reflection And Transmission ◽  
Light Levels ◽  
Dual Detector ◽  
Air Interfaces

AbstractAn understanding of the reflection and transmission of light by snow is important for snow thermodynamics, hydrology, ecology and remote sensing. Snow has an intricate microstructure replete with ice/air interfaces that scatter light. Spectral observations of light reflection and transmission, from 400 to 1000 nm, were made in temperate snowpacks, under cold and under melting conditions. The optical observations were made using a dual-detector spectroradiometer. One detector was placed above the snow surface to monitor the incident and reflected solar irradiance, and the second detector was placed at the base of snow cover to measure downwelling irradiance. The optical measurements were supplemented by a physical characterization of the snow, including depth, density and an estimate of grain size. In general, transmitted light levels were low and showed a strong spectral dependence, with maximum values between 450 and 550 nm. For example, a 10 cm thick snow layer reduced visible transmission (500 nm) to about 5% of the incident irradiance, and infrared transmission (800 nm) to less than 1%. Extinction coefficients were in the range 3–30 m−1, and tended to decrease slightly as the snow aged and increase as snow density increased.

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