Results 221 to 230 of about 60,075 (261)

Search for the optimum numerical aperture

Microelectronic Engineering, 1990
Abstract Results on the dependences of focus and exposure dose latitudes on the numerical aperture of lithographic g-line, i-line, and KrF exposure systems are given for 0.6, 0.8 and 1.0 um lines and spaces. This is done for two different resist systems by both SAMPLE 1.7 simulations and g-line experiments.
Christoph Nölscher, Leonhard Mader, Sabine Guttenberger, Wolfgang Arden   +3 more
openaire   +1 more source

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

Maximum and effective numerical apertures of a planar microlens

Applied Optics, 1984
A planar microlens with N.A. = 0.54 has been obtained (Δn = 0.27) by stacking two lenses. The maximally obtainable N.A. is then expected to be ~0.7 but it is limited by aberration, which is discussed theoretically using a Luneburg lens model.
S, Misawa, M, Oikawa, K, Iga
openaire   +2 more sources

Disorder-mediated enhancement of fiber numerical aperture

Optics Letters, 2013
The numerical aperture (NA) of a multimode optical fiber sets the limit of the information transport capacity along the spatial degree of freedom. In this Letter, we report that the application of a highly disordered medium can overcome the capacity limit set by the fiber NA.
Youngwoon, Choi, Changhyeong, Yoon, Moonseok, Kim, Juhee, Yang, Wonshik, Choi   +4 more
openaire   +2 more sources

The numerical aperture of an optical fiber

ICALEO '92: Proceedings of the Challenges in Lasers in Education Symposium, 1992
We measure the numerical aperture of an optical fiber by two methods: one in which we vary the input field’s angle of incidence and a second in which we measure the spatial spread of the fiber’s output field. The accuracy and speed of these methods is compared.
David F. Nall, Gregory M. Alman
openaire   +1 more source

A numerical method in power synthesis of aperture antennas

1986 Antennas and Propagation Society International Symposium, 1986
An iterative function is presented which explicitly takes into account the power radiated by the aperture source outside the range of interest and intrinsically implies a constraint on the superdirectivity of the reconstructed field. This function is designed to synthesize an aperture field with given radiation characteristics.
D'ELIA, GIUSEPPE, G. Leone, R. Pierri
openaire   +3 more sources

Effect of numerical aperture on interference fringe spacing

Applied Optics, 1995
The effect of numerical aperture on the fringe spacing in interferometry is analyzed by the use of wave optics. The results are compared with published experimental results, and the influence of apodization of the wave front is discussed. The effects of central obscuration and surface tilt are also considered.
C J, Sheppard, K G, Larkin
openaire   +2 more sources

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
openaire   +1 more source

Macrobending effects on fiber numerical aperture

Journal of Lightwave Technology, 1987
The influence of microbending on the numerical aperture of three sides of optical fiber has been studied. From this, the smallest bending diameter to not have a dramatic effect on numerical aperature has been determined.
null Ying Kiang, T. Klieber
openaire   +1 more source

Numerical apertures of light microscope objectives

Journal of Microscopy, 1993
SUMMARYThe numerical aperture of light‐microscope objectives is measured via the exit angle of the rear lens towards the image space, and the magnification of the objective. The method is reliable because of its simplicity and is independent of special instrumentation such as apertometers.
W. LEHMANN, A. WACHTEL
openaire   +1 more source