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Printable Bifocal Microlenses from Ferroelectric Nematic Liquid Crystal Droplets. [PDF]
ACS Appl Mater InterfacesTalwar M, Siddiquee Z, Jákli A.
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Three-dimensional passive acoustic mapping of high intensity focused ultrasound fields using sparse synthetic apertures from rotated one-dimensional linear arrays. [PDF]
Sci RepKang G, Hwang JH.
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Determination of focal length of large focal length convex lenses
Optics and Laser Technology, 1996In the determination of focal length of large focal length lenses, conventionally, a large length of optical bench is needed to accommodate the experimental set-up, and the measurements are associated with bench errors. In order to overcome these drawbacks, a simple method is suggested wherein the use of a plane mirror reduces the required length of ...
O. Prakash, R.S. Ram
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Variable focal length microlenses
Optics Communications, 2000Abstract Refractive surface relief microlenses (150 μm diameter) are immersed in nematic liquid crystal in a cell. Application of a variable voltage across the cell effectively varies the refractive index of the liquid crystal and results in a change of the focal length by the lensmakers formula (E.
D R Selviah
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Focal length, EFL, and the eye
Applied Optics, 2023The focal length is often called the effective focal length, or efl instead, and although this is acceptable for a lens in air, it is not otherwise correct. The eye is used as an example here for an optical system where the object is in air and the image is in fluid.
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Focal length and compression of space
Proceedings of IEEE Conference on Computer Vision and Pattern Recognition, 2002Images taken with long telephoto lenses exhibit a characteristic perspective distortion known as compression of space. Objects that are actually far apart appear unusually close together, and observed texture gradients and optic flows impart a distorted sense of orientation and depth. An attempt is made to quantify the space compression.
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Focal length and focal depth of metallic superlens
SPIE Proceedings, 2012We consider the problems of focal length and focal depth of subwavelength imaging via a silver slab of metallic superlens . The performance limit of the metallic superlens was associated with the losses in the metallic film. The transmittance through a metal film is quite low and decreases exponentially with the thickness of ...
Pengfei Cao +6 more
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