The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
By using existing metal mesh technology we propose a new lens design that behaves in a similar way to a Wollaston Prism. That is, a device that separates out the two linear polarised states of the incident field and then focuses them separately on same focal plane. The design is an evolution of an existing GRIN lens based on the same technology. The proposed lens design has a diameter of 75mm while...
Zinc oxide (ZnO) nanoparticles incorporating within polyethylene glycol (PEG) were deposited on the surface of silicone hydrogel through matrix-assisted pulsed laser evaporation (MAPLE). In this process, frozen sample was irradiated under a pulsed Nd: YAG 532nm laser for one hour. The MAPLE process is able to maintain the chemical backbone of polymer, and prevents the nanocomposite coating from contamination...
We recently showed (Savini 2012) the use of stacked graded photolithographic capacitive metal-mesh structures on polypropylene substrates to produce a thin flat Wood lens working in a wide (90%) bandwidth. Here an additional impedance-matched layer is designed to improve the original lens efficiency in a wide band around the central frequency of operation.
A flat lens-filter (or lenster) has recently been produced using capacitive metal-mesh structures on polypropylene substrate. The prototype was designed using a combination of a transmission line method(TLM) and HFSS. Its performance was measured and compared to a standard polypropylene lens. We propose to perform further measurements, focusing on the phase, to give a deeper understanding on how the...
The use of capacitive metal-mesh structures on polypropylene substrates is routinely used in far infrared astronomy for the purpose of spectral low-pass filtering. The transmission of these filters well below their cut-off frequency follows the well known behavior of a Fabry-Perot etalon due to the fairly achromatic nature and finite thickness of the embedding substrate. We show how it is possible...
This paper according to the problems of weak echo signal in the optical system of laser fuze. By analyzing the factors of measuring distance, combined with the specific requirements of laser fuze, according to aspheric optical design theory, using Optical Software of ZEMAX. Design single receive focusing lens of laser fuze. Simulation results show that the echo signal can be efficiently brought together...
This paper investigates the problems of the large beam divergence angle and short detection range in the launch system of laser proximity fuze. By analyzing the factors of measuring distance in laser proximity fuze, combined with characteristics of laser's far-field divergence angle, and according to aspheric optical design theory, we carry out image processing and simulation of laser spot by using...
Four-beam laser interference lithography (LIL) was shown to be a good technology to generate graded-index photonic crystals with a square lattice. Characters of the structure vary regularly with the incident angles and relative thresholds. The finite-difference time-domain method was used to validate the focusing behavior of the resultant structure. High intensity enhancement and sub-wavelength focusing...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.