نتایج جستجو برای: physical optics
تعداد نتایج: 694911 فیلتر نتایج به سال:
We establish the connection between decoherence-free subspaces of quantum information and spontaneous emission cancellation in quantum optics with molecules. Both phenomena rely on the destructive interference of transition amplitudes from two initial states to a common target state. We discuss physical similarities, differences, and limitations of both phenomena.
Second-order nonlinear optics is the base for a large variety of devices aimed at active manipulation light. However, physical principles restrict its occurrence to non-centrosymmetric, anisotropic matter. This significantly limits number materials exhibiting optics. Here, we show that embedding chromophores in an array conical channels 13 nm across monolithic silica results mesoscopic matter a...
The quantum Zeno effect and electromagnetically induced transparency (EIT) phenomenon are the results of a specific population transfer in a three level systems. They are based on the inequality of forward and reversed processes. However, a more simple two level systems better suit now for experimental study of this fundamental property in optics. The concept of quantum Zeno effect (paradox) wa...
Reconfigurable intelligent surfaces (RISs) are one of the potential technologies for 6th generation (6G) mobile communication systems with superior electromagnetic (EM) wave-steering capability to effectively control phase, amplitude, and polarization incident EM wave. An implementation-independent physical RIS model key characteristics is especially crucial channel modeling considering trade-o...
Since the discovery of nuclear gamma-rays, its imaging has been limited to pseudo imaging, such as Compton Camera (CC) and coded mask. Pseudo imaging does not keep physical information (intensity, or brightness in Optics) along a ray, and thus is capable of no more than qualitative imaging of bright objects. To attain quantitative imaging, cameras that realize geometrical optics is essential, w...
This article provides a review of early work and developments in the field of near-field optics. The roots trace back to the letters exchanged between Edward Hutchinson Synge and Albert Einstein in 1928 and, because of the analogy to antenna theory and lightning rods, the origins project back to the time of Benjamin Franklin who discovered the wonderful Effect of Points both in drawing off and ...
We have designed a 460 GHz FFO-driven integrated SIS receiver in which the signal is fed via a quasi-optical hybrid antenna feeding system. Since in such quasi-optical SIS receivers the contribution of the quasi-optics to the overall receiver noise is considerable, it is important to be able to analyze the antenna efficiency in order to optimize its coupling and improve the noise temperature of...
Free-space optical interconnection networks can be classi ed into two types, space variant and space invariant, according to the degree of space variance [1]. The degree of space variance determines the network's complexity and regularity. A totally space variant network allows a completely arbitrary interconnection between nodes, whereas a totally space invariant network has a de nite, regular...
the diffractive multifocal iol provides simultaneous bifocal imaging by utilizing both diffractive and refractive optics. in both distant and near vision, there is a clear highly focused image on the retina. the second image is highly defocused, providing only faint background illumination. a small amount of the light goes to the higher orders of diffraction which are not perceptible by eyes. t...
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