Revolutionary devices that can get around the diffraction limit
include so-called superlenses made from metamaterials with negative refraction indices that bend light in an opposite sense to conventional materials.
Nonlinear dielectric slot waveguides, which confine light in a low-index nonlinear region between high index materials based on the discontinuity of normal electric field components at the interface, have shown a remarkable ability for all optical Kerr switching devices because the light can be confined beyond the diffraction limit
in a direction perpendicular to the slot.
In fact, the diffraction limit
was never a "hard" limit, and several caveats exist that point the way toward subdiffraction imaging.
This diffraction limit
arises from the fact that it is impossible to focus light to a spot smaller than half its wavelength.
For a microscope using visible light (400-700 nm), the diffraction limit
is roughly 250 nm.
For sharp tips, the electromagnetic coupling was confined to a lateral range of a few nanometers, a factor of 100 better than the diffraction limit
of conventional optics.
While space looked like the undisputably best locale for maximizing angular resolution when the Hubble Telescope was launched in 1990, a new technology--adaptive optics--has since emerged that promises to thrust ground-based observation far along on the road toward the diffraction limit
already claimed by Hubble.
Contract Awarded for The wavefront error measurement imaging system pupil, As the incident beam wavefront distortion correction based on, Can make the researchers here on the basis of the data to compensate for the wavefront aberration caused by a variety of factors, The objective to get close to the diffraction limit
of target imaging
Based on the concept of stimulated emission depletion technology (STED) developed by Stefan Hell at Max Planck Institute, the TCS SP8 STED 3X uses superimposed lasers to reduce the effective focal spot scanning the specimen to an area smaller than the diffraction limit
The 3D STED system achieves resolutions below the diffraction limit
in lateral as well as axial directions.
Super resolved images are important in many areas, but the diffraction limit
is a road-block for conventional optical instruments.
Coherent light sources at the nanometer scale are important not only for exploring phenomena in small dimensions but also for realizing optical devices with sizes that can beat the diffraction limit
of light," said Teri Odom, a nanotechnology expert who led the research.