Liquid lens with adjustable focus for ultrasonic imaging
Sign Up to like & getrecommendations! Published in 2021 at "Applied Acoustics"
DOI: 10.1016/j.apacoust.2020.107787
Abstract: Abstract An acoustic lens is an attractive device due to its superior ability to image and focus acoustic beams. Nevertheless, the limitation of such a solid-phase device is apparent in that once an acoustic lens… read more here.
Keywords: focal length; liquid lens; focus; liquid acoustic ... See more keywords
About the validity of the parabolic approximation in Kerr lensing effect
Sign Up to like & getrecommendations! Published in 2019 at "Optik"
DOI: 10.1016/j.ijleo.2019.162986
Abstract: Abstract The usual parabolic approximation used for modelling the focusing properties of a Kerr lens induced by a Gaussian laser beam, through optical Kerr effect, consists to roughly approximate a Gaussian profile by a parabola.… read more here.
Keywords: kerr; parabolic approximation; focal length; effect ... See more keywords
Trajectory and focal length of circular Airy beams with different launch angles in linear potentials
Sign Up to like & getrecommendations! Published in 2019 at "Optics Communications"
DOI: 10.1016/j.optcom.2019.06.020
Abstract: Abstract In this paper, the propagation dynamics of circular Airy beams (CABs) with different initial launch angles through a medium having linear potential is studied analytically and numerically. The results show that the trajectory and… read more here.
Keywords: airy beams; focal length; trajectory focal; circular airy ... See more keywords
Optimal focal length of primary mirrors in Fresnel linear collectors
Sign Up to like & getrecommendations! Published in 2017 at "Solar Energy"
DOI: 10.1016/j.solener.2017.07.079
Abstract: In a linear Fresnel plant adopting slightly curved primary mirrors (cylindrical or parabolic), a significant gain in the collected radiation can be achieved using primary mirrors with different focal lengths, dependent on the position of… read more here.
Keywords: focal length; length primary; optimal focal; focal lengths ... See more keywords
Millimeter-scale focal length tuning with MEMS-integrated meta-optics employing high-throughput fabrication
Sign Up to like & getrecommendations! Published in 2022 at "Scientific Reports"
DOI: 10.1038/s41598-022-09277-8
Abstract: Miniature varifocal lenses are crucial for many applications requiring compact optical systems. Here, utilizing electro-mechanically actuated 0.5-mm aperture infrared Alvarez meta-optics, we demonstrate 3.1 mm (200 diopters) focal length tuning with an actuation voltage below… read more here.
Keywords: meta optics; optics; length tuning; focal length ... See more keywords
Study of aerodynamic focusing lens stacks (ALS) for long focal length aerosol-assisted focused chemical vapor deposition (AAFCVD)
Sign Up to like & getrecommendations! Published in 2021 at "RSC Advances"
DOI: 10.1039/d0ra08447f
Abstract: Mask-free direct printing can alleviate the high cost and high consumption involved in photo-lithography for chip processing. Most of their technical routes are based on the traditional short focal length nozzles, which is suffered from… read more here.
Keywords: system; aerosol assisted; focal length; deposition ... See more keywords
Optimization of positioning technology of aspheric compound eyes with variable focal length
Sign Up to like & getrecommendations! Published in 2019 at "AIP Advances"
DOI: 10.1063/1.5032268
Abstract: For single non-uniform surface compound eyes cannot achieve zoom imaging, resulting in poor imaging and other issues, a new type of aspherical artificial compound eye structure with variable focal length is proposed in this paper.… read more here.
Keywords: focal length; artificial compound; compound eye; micro lens ... See more keywords
A polarisation-free blue phase liquid crystal lens with enhanced tunable focal length range
Sign Up to like & getrecommendations! Published in 2018 at "Liquid Crystals"
DOI: 10.1080/02678292.2018.1542748
Abstract: ABSTRACT A polarisation-free blue phase liquid crystal (BPLC) lens with enhanced tunable focal length range is proposed. A matched conventional glass lens is introduced on a BPLC lens to increase the range of the tunable… read more here.
Keywords: length; focal length; phase; range ... See more keywords
Determination of the refractive index of an equiconvex lens by measuring its focal length and using it as a concave mirror
Sign Up to like & getrecommendations! Published in 2021 at "Physics Education"
DOI: 10.1088/1361-6552/ac27f4
Abstract: In this experiment we have first determined the focal length of an equiconvex lens. We have observed that a real image can be formed by the lens on the same side of the source if… read more here.
Keywords: concave mirror; focal length; equiconvex lens; refractive index ... See more keywords
Soft lenses with large focal length tuning range based on stacked PVC gel actuators
Sign Up to like & getrecommendations! Published in 2024 at "Smart Materials and Structures"
DOI: 10.1088/1361-665x/ad61a5
Abstract: A novel tunable lens with large focal length change and driven by stacked polyvinyl chloride (PVC) gel actuators is designed and characterized in this study. The lens rigid parts are 3D-printed and commercially available, whereas… read more here.
Keywords: gel actuators; length; large focal; pvc gel ... See more keywords
Abnormal focal length increase of terajet generated in reflection mode
Sign Up to like & getrecommendations! Published in 2025 at "Chinese Physics B"
DOI: 10.1088/1674-1056/add903
Abstract: We report an interesting and abnormal electromagnetic phenomenon with regard to a terajet (TJ) that is generated in a reflection mode, which is realized by placing a dielectric scatterer onto a metal reflection plate. We… read more here.
Keywords: generated reflection; reflection mode; terajet generated; reflection ... See more keywords