Results 221 to 230 of about 27,968 (274)
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Nature Communications
Terahertz (THz) lens constitutes a vital component in the THz system. Metasurfaces-based THz metalenses and classical bulky lenses are severely constrained by chromatic/ spherical aberration and the diffraction limit.
Jin Chen +4 more
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Terahertz (THz) lens constitutes a vital component in the THz system. Metasurfaces-based THz metalenses and classical bulky lenses are severely constrained by chromatic/ spherical aberration and the diffraction limit.
Jin Chen +4 more
semanticscholar +1 more source
High Numerical Aperture Achromatic Meta‐Devices Through Dispersion Compensation
Advanced Functional MaterialsDispersion engineering is a long‐standing challenge in optical systems, and it is particularly important for metasurfaces, which naturally suffer from strong chromatic aberrations due to their ultralow profile.
Yuzhong Wang +5 more
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An RGB‐Achromatic Aplanatic Metalens
Laser and Photonics ReviewsOptical metalenses offer a compact approach for the development of nanoscale optical devices with various imaging functionalities. Realizing high‐quality images using metalenses with large numerical aperture (NA) requires eliminating unwanted optical ...
Haofei Xu, Zhang-Kai Zhou
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Optometry and Vision Science, 1991
ABSTRACT Ocular chromatic dispersion manifests itself as wavelength‐dependent image planes, image sizes, and image positions, and it has been suggested that ocular chromatic aberration is the most important of the eye's optical aberrations.
A, Bradley, X X, Zhang, L N, Thibos
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ABSTRACT Ocular chromatic dispersion manifests itself as wavelength‐dependent image planes, image sizes, and image positions, and it has been suggested that ocular chromatic aberration is the most important of the eye's optical aberrations.
A, Bradley, X X, Zhang, L N, Thibos
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Nano letters (Print)
Metasurfaces provide an ultrathin platform for compact, real-time polarimetry. However, their applications in polychromatic scenes are restricted by narrow operating bandwidths that causes spectral information loss.
Yueqiang Hu +5 more
semanticscholar +1 more source
Metasurfaces provide an ultrathin platform for compact, real-time polarimetry. However, their applications in polychromatic scenes are restricted by narrow operating bandwidths that causes spectral information loss.
Yueqiang Hu +5 more
semanticscholar +1 more source
Documenta Ophthalmologica, 1988
In congenital total color blindness direct current recordings of the electroretinogram displayed a negativity following the b-wave, not present in recordings of normal eyes. This negativity, preceding the onset of the c-wave, is probably caused by the lack of cone contribution to the positive c-wave component.
A, Thaler, M R, Lessel, P, Heilig
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In congenital total color blindness direct current recordings of the electroretinogram displayed a negativity following the b-wave, not present in recordings of normal eyes. This negativity, preceding the onset of the c-wave, is probably caused by the lack of cone contribution to the positive c-wave component.
A, Thaler, M R, Lessel, P, Heilig
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Applied Optics, 1991
An investigation of the chromatic properties of waveguide lenses is described. In general, the focal length of mode-index and Fresnel zone (diffractive) lenses will be a function of wavelength. As a result, these lenses will have high optical quality over only a relatively small wavelength range.
K E, Spaulding, G M, Morris
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An investigation of the chromatic properties of waveguide lenses is described. In general, the focal length of mode-index and Fresnel zone (diffractive) lenses will be a function of wavelength. As a result, these lenses will have high optical quality over only a relatively small wavelength range.
K E, Spaulding, G M, Morris
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Temporal summation in the achromat
Vision Research, 1988We investigated temporal summation of the rods in a complete achromat, who lacks cone vision. Critical duration (tc) was estimated both at the achromat's preferred area of fixation and at an area 12 deg laterally in the nasal visual field. Comparable tc determinations were made in a normal trichromat. At background luminances of 0.0 and 0.6 scot.
L T, Sharpe, C, Fach, K, Nordby
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Applied Optics, 2006
The principles of wavefront reconstruction by means of a geometric-optical reflection of radiation from surfaces of interference fringe maxima are discussed. The optical elements based on these principles should be achromatic. Two methods of the optical elements design are proposed. The first method is a direct holographic recording of the interference
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The principles of wavefront reconstruction by means of a geometric-optical reflection of radiation from surfaces of interference fringe maxima are discussed. The optical elements based on these principles should be achromatic. Two methods of the optical elements design are proposed. The first method is a direct holographic recording of the interference
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Approximation Algorithms for the Achromatic Number
Journal of Algorithms, 2001Summary: The achromatic number for a graph \(G=\langle V,E \rangle\) is the largest integer \(m\) such that there is a partition of \(V\) into disjoint independent sets \(V_1,\dots,V_m\) such that for each pair of distinct sets \(V_i\), \(V_j\), \(V_i\cup V_j\) is not an independent set in \textit{G. M. Yannakakis} and \textit{F. Gavril} [SIAM J. Appl.
CHAUDHARY, A, VISHWANATHAN, S
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