Results 231 to 240 of about 223,073 (288)

Defocused illumination with beam-shaping condenser for uniform wide-field X-ray imaging. [PDF]

J Synchrotron Radiat
Zhang K, Luo Y, Di Y, Guo C, Li C, He M, Zhang C, Peng F, Liu W, Wu Z, Guan Y, Tian Y, Liu G.   +12 more
europepmc   +1 more source

Numerical study on the impact of coal fractures on seismic wave dispersion and attenuation: anisotropic WIFF effects. [PDF]

Sci Rep
Li B, Zou G, Wang J, Chen H, Zhu G.
europepmc   +1 more source

Aberration corrections for quasi-conformal transformation optics-based reflectors. [PDF]

Sci Rep
Cross B, Friedrichs G, Filipovic D.
europepmc   +1 more source

Influencing Factors and Optimization of Coal Fines Transportability in Mine Borehole Screen Pipes. [PDF]

ACS Omega
Zhang X, Tian K, Gao J, Wang Y, Liu Q, Hui X, Li Q.   +6 more
europepmc   +1 more source

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High numerical aperture microwave metalens

Optics Letters, 2020
The numerical aperture (NA) of a lens determines its focusing resolution capability and the maximum light collection or emission angle. In this Letter, an ultrathin high NA metalens operating in the microwave band is designed and demonstrated both numerically and experimentally.
Yong-Qiang Liu, Jinhai Sun, Yongxing Che, Kainan Qi, Liangsheng Li, Hongcheng Yin   +5 more
openaire   +2 more sources

High-numerical-aperture effects in photoresist

Applied Optics, 1997
Two-beam and three-beam vector interference in thin photoresist films is used to illustrate the striking differences between s -polarized and p-polarized high-numerical-aperture illumination. Both simulations and experiments are performed for several cases, including undyed photoresist on silicon, dyed photoresist on silicon, and the addition of an ...
D G, Flagello, T D, Milster
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Ultrahigh-numerical-aperture imaging concentrator

Journal of the Optical Society of America A, 1997
A monochromatic analysis of the RX nonimaging concentrators as imaging optical systems is presented (R stands for refractive, X for reflective). All of them have rotational symmetry and an image-side numerical aperture of 1.46 with the use of an index of refraction n′=1.5, which means a half-rim angle of illumination of 77 deg. This is equivalent to 95%
Pablo Benı́tez, Juan C. Miñano
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High-numerical-aperture scalar imaging

Applied Optics, 2001
The equation for partially coherent high-numerical-aperture scalar imaging was originally derived by Cole et al. [Jpn. J. Appl. Phys. 31, 4110 (1992)]. Here I present an alternative derivation, based on the plane-wave spectral representation of propagation, which can, at least in some respects, be viewed as more straightforward.
openaire   +2 more sources