The diffraction-limited spot size can be far larger than the wavelength e.g. if you need to focus a beam over a large distance with limited numerical aperture. 2022-02-21 If we calculate the beam diameter of a laser beam at some large distance from the source, do we need to calculate...
The factors which influence the size of the heat-affected zone of a material on which a focused electron beam is incident are reviewed. These include the limitation of current density in the focused spot, which is given by the Langmuir relation, and also the limitation imposed by the ...
The size of the image of a point formed by a perfect lens (i.e. one with no other aberrations) can be calculated and is shown in the table below. The image of a point is known as the diffraction limited spot size and the value is given in microns (1 micron is 1/1000 mm). So ...
Next, we generated self-similar super-oscil- lating HG10 beams, having two lobes with identical size Eð1737 58Þ nm for rπ = 0.72rmax, where each lobe is significantly smaller than the diffraction-limited spot size, see Figure 2d3 and 2d5. The beam waist of SO-HG function is 1 ...
Coherent x rays can be focused to a very small (diffraction-limited) spot size, thus allowing construction of high spatial resolution microprobes. This ... Yun,B W.,Viccaro,... - 《Review of Scientific Instruments》 被引量: 13发表: 1992年 加载更多来源...
This method has the special property that for this f/stop, the computed Airy disk diffraction maximum resolution limit is exactly the SAME as the sensor sampling maximum resolution (so it is not quite limited). Resolution is strongly dependent on sensor size and pixel size, but it should make...
The dynamic and static corrections are tested with the deformable mirror. When correcting wavefront aberrations with the deformable mirror, the focal spot having a 1.2 times spot size of the diffraction-limited focal spot is observed. 展开
Thus, the only mechanism for optimizing spatial resolution and image contrast is to minimize the size of the diffraction-limited spots by decreasing the imaging wavelength, increasing numerical aperture, or using an imaging medium having a larger refractive index. However, under ideal conditions with ...
Arm-waving: Lenses can focus light to a small spot but not a point. The spot size can vary with the wavelength, with short wavelengths forming smaller spot sizes than longer ones. When a very good, aberration-free (diffraction-limited) lens is used, collimated light will produce an airy ...
We achieved highly efficient 3D focusing with subwavelength resolution and diffraction-limited imaging. The high focusing performance even allows diffraction-limited imaging at different focal positions with varying magnifications. Our work paves the way for downscaling of optical devices using 2D materials...