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
Graphene-based metalens with rotatable radiation pattern composed of cross-shaped apertures
Sign Up to like & getrecommendations! Published in 2020 at "Optical Engineering"
DOI: 10.1117/1.oe.59.7.077101
Abstract: Abstract. A method for designing a metalens with electrically tunable focal length is proposed and analyzed. Metasurfaces are defined as low-thickness devices to initiate and generate the abrupt electromagnetic wavefront variation. However, there is no… read more here.
Keywords: focal length; shaped apertures; based metalens; graphene based ... See more keywords
Controllable terahertz beam focusing and rotating by graphene-assisted microring metasurfaces
Sign Up to like & getrecommendations! Published in 2023 at "Optical Engineering"
DOI: 10.1117/1.oe.62.4.045101
Abstract: Abstract. This research proposes a terahertz (THz) metalens for focusing THz waves with an electrically controllable focal length. The dynamic of tuning of THz metalenses with graphene provides high controllability, fast responses, and compact structures… read more here.
Keywords: graphene; thz; controllable terahertz; focal length ... See more keywords