The advantages of this method are its large scale manipulation of the dark spot size and its high performance in suppressing side-lobe intensity, which is of great worth in enhancing the performance of many systems such as optical tweezers and stimulated emission depletion (STED) microscope.
One technique uses saturation phenomena in the optical effects, including stimulated emission depletion (STED) microscopy [ 7], saturated structured-illumination microscopy (SSIM) [ 8], saturated excitation (SAX) microscopy [ 9].
The easternmost dark band would be the optical signature of a primary ESF depletion.
However, subdiffraction optical methods, such as stimulated emission depletion and selective photoactivation, are beginning to allow single fluorophores to be localized down to tens of nanometers, usually at a cost to measurement time and thus the ability to probe dynamics.
Other super-resolution optical imaging techniques such as stimulated emission depletion (STED) microscopy [ 13] which uses superlocalized depletion of the excited state by stimulated emission with few tens nanometers spatial resolution being demonstrated are severely limited in penetration depth to few tenths microns and limited for deep imaging applications.
The presence of dust is generally inferred by depletion in the UV and optical bands.
At equatorial and low latitude regions, the all-sky imaging observations of the OI 630 nm emission show quasi north-south aligned intensity depletion bands, which are the optical signatures of large scale F-region plasma irregularities.
Recently developed methods allow the measurement of intracellular structures based on immunostaining in myocytes, below the traditional fluorescence resolution limits, the so-called super-resolution microscopy, including STED (STimulated Emission Depletion) and dSTORM (direct Stochastic Optical Reconstruction Microscopy).
Modern microscopes use techniques including stimulated emission depletion microscopy and near-field scanning optical microscopy that relies on the properties of evanescent waves.
While super-resolution microscopy of purified DNA has been performed by direct stochastic optical reconstruction microscopy (dSTORM) [17] and stimulated emission depletion (STED) microscopy, [18] this is the first example of super-resolution microscopy of DNA in a cellular context.
