Light diffraction patterns can be unintuitive and are best seen with laser light. The diffraction pattern of a square hole is cross-shaped, while a circular aperture produces a series of concentric circles. Diffraction by water droplets or ice crystals in thin clouds sometimes creates a beautiful ...
Deviation of the direction of propagation of a beam of light, which occurs when the light passes the edge of an obstacle such as a diaphragm, the pupil of the eye or a spectacle frame. There are two consequences of this phenomenon. First, the image of a point source cannot be a point...
The light passing through a thin slit is sensed by a photo-electric detector and, in this way, the variations of the slit opening may be recorded immediately on the oscilloscope screen. The sensitivity of such displacement measurement is comparable with wavelenghts of light. Attention has been ...
Diffraction Limited’s line of high performance or “scientific grade” CCD and CMOS cameras are designed to operate under extremely low-light conditions with high sensitivity, low... Calibrating CMOS Images I’m often asked how CMOS Active Pixel Sensors differ from CCD sensors in terms of image...
Diffraction Limited’s line of high performance or “scientific grade” CCD and CMOS cameras are designed to operate under extremely low-light conditions with high sensitivity, low... Calibrating CMOS Images I’m often asked how CMOS Active Pixel Sensors differ from CCD sensors in terms of image...
We use fluorescent nanospheres as scalar detectors for the electric-field intensity in order to probe the near-field of an optical tip used in aperture-type near-field scanning optical microscopy (NSOM). Surprisingly, the recorded fluorescence images show two intensity lobes if the sphere diameter ...
Stillman is the significant fact that in securing the fleeting images of the rings on the gelatine plate-the actinic rays being alone effective-alternate dark and bright concentric rings are produced, as in the case of homogeneous or monochromatic light, instead of the coloured, rings seen by ...
Diffraction-enhanced images (DEI) have been obtained using two silicon crystals. A first channel-cut silicon crystal using the Si(333) reflection is employed to reduce the divergence of the pre-monochromated Si(111) beam of the light line to 60 microradian (12 arcsec). A second channel-cut...
We report the experimental implementation of optical diffraction tomography for quantitative 3D mapping of refractive index in live biological cells. Using a heterodyne Mach-Zehnder interferometer, we record complex field images of light transmitted through a sample with varying directions of illumination. ...
(b), images are recorded using a nano-focused X-ray beam in transmission, as sketched in (c). (d) Microfluidic chamber for monolayer fusion experiments, and positioning in the X-ray beam. (f) Contour of the adhering monolayers and associated Fresnel fringes before the onset of bi...