منابع مشابه
Optics beyond the diffraction limit
In this lecture, we introduce the basic concepts of near-field optics using two different points of view: the plane-wave angular spectrum and the electric-dipole radiation. The first approach leads naturally to the diffraction limit and to the concepts of evanescent waves and near field. The second approach shows that the basic laws of electromagnetic radiation also lead to the classical resolu...
متن کاملk- Microscopy – resolution beyond the diffraction limit
We present a novel Fourier domain method for microscopic imaging – so-called kmicroscopy– with lateral resolution independent of the detection numerical aperture. The concept is based on sample illumination by a lateral fringe-pattern of varying spatial frequency, which probes the lateral spatial frequency or kspectrum of the sample structure. The illumination pattern is realized by interferenc...
متن کاملNanoparticle sizing with a resolution beyond the diffraction limit using UV light scattering spectroscopy
We investigated the detection of dielectric nanoparticles using static light scattering spectroscopy (LSS) in the UV range (from 250 to 390 nm). The light scattered by the polystyrene nanospheres in the backward direction were collected by means of an optical fiber probe and a charge-coupled device (CCD) spectrograph. The size distributions of the nanoparticles were obtained by a discrete inver...
متن کاملFocusing beyond the diffraction limit with far-field time reversal.
We present an approach for subwavelength focusing of microwaves using both a time-reversal mirror placed in the far field and a random distribution of scatterers placed in the near field of the focusing point. The far-field time-reversal mirror is used to build the time-reversed wave field, which interacts with the random medium to regenerate not only the propagating waves but also the evanesce...
متن کاملFocusing of light beyond the diffraction limit of half the wavelength.
The diffraction limit sets the smallest achievable linewidth at half the wavelength. With a subwavelength plasmonic lens allowing one to reduce the diffraction via an asymmetry and to generate and squeeze the wave functions, an incident light is focused by the aperture to a single line with its width smaller than the limited value in the intermediate zone. The focused fields are capable of prop...
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ژورنال
عنوان ژورنال: Optics Express
سال: 2016
ISSN: 1094-4087
DOI: 10.1364/oe.24.028987