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Spectroscopy – I. Gratings and Prisms
Spectroscopy – I. Gratings and Prisms

... If we could see the whole spectrum (radio to γ–ray), then every order would completely overlap with every other order. In reality, of course, many effects limit what we can see/measure. For example, the atmosphere will eliminate most photons at shorter wavelengths than about 340nm – as well as large ...
Far-Field Optical Superlens
Far-Field Optical Superlens

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... The instability threshold is inferred from the lowest-lying branches of the stability condition of the most unstable mode: s max(K; G0 , E0 , r0) 5 0. The polarity of the external field exerts a profound influence on the stability behavior of the medium. In the case of positive polarity (E 0 . 0) th ...
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super-resolved fluorescence microscopy
super-resolved fluorescence microscopy

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... [email protected] ...
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Disorder-Enhanced Imaging with Spatially Controlled Light
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... and by the optical properties of the film. The details of the substrate structure are not required to derive r⬘. This finding allows us to identify the value r of the substrate that optimizes either the contrast or the clarity for graphene imaging. The equations derived here apply to any ambient med ...
Counterpropagating optical beams and solitons
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... the mutual change of the optical refractive index. A configuration of two waves interacting in a NL material is one of the most frequent ones in laser physics and wave mixing experiments. Numerous concepts in NL optics, such as phase conjugation, Bragg reflection by volume gratings, wave-mixing in pho ...
Nonlinear Beam Shaping with Plasmonic Metasurfaces
Nonlinear Beam Shaping with Plasmonic Metasurfaces

... ABSTRACT: We present here a method for generating second-harmonic beams with tailored beam profiles using nonlinear metasurfaces based on split ring resonators. By manipulating both the phase and the amplitude of the quadratic nonlinear coefficient locally, at the single inclusion level, the emitted se ...
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Diffraction topography

Diffraction topography (short: ""topography"") is an quantum beam imaging technique based on Bragg diffraction.Diffraction topographic images (""topographies"") record the intensity profile of a beam of X-rays (or, sometimes, neutrons) diffracted by a crystal.A topography thus represents a two-dimensional spatial intensity mapping of reflected X-rays, i.e. the spatial fine structure of a Laue reflection.This intensity mapping reflects the distribution of scattering power inside the crystal; topographs therefore reveal the irregularities in a non-ideal crystal lattice.X-ray diffraction topography is one variant of X-ray imaging, making use of diffraction contrast rather than absorption contrast which is usually used in radiography and computed tomography (CT). Topography is exploited to a lesser extends with neutrons and other quantum beams. In the electron microscope community, such technique is called dark field imaging or diffraction contrast imaging.Topography is used for monitoring crystal quality and visualizing defects in many different crystalline materials.It has proved helpful e.g. when developing new crystal growth methods, for monitoring growth and the crystal quality achieved, and for iteratively optimizing growth conditions.In many cases, topography can be applied without preparing or otherwise damaging the sample; it is therefore one variant of non-destructive testing.
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