Design and Fabrication of Far-Ultraviolet Reflective Broadband Filter Based on Dielectric Materials

2018 ◽  
Vol 72 (6) ◽  
pp. 943-946 ◽  
Author(s):  
Xiaodong Wang ◽  
Bo Chen ◽  
Ling Yao
Keyword(s):  
Wavelength Range ◽  
Optical Materials ◽  
Design Method ◽  
Dielectric Materials ◽  
Magnesium Fluoride ◽  
Lanthanum Fluoride ◽  
Wide Angle ◽  
Successful Design ◽  
Far Ultraviolet ◽  
High Reflectance

In the far-ultraviolet (UV) region, optical materials are dispersive and absorbing. The previous successful design method utilized in the visible band should be re-examined. We report on the design and fabrication of a far-UV reflective broadband filter based on dielectric materials lanthanum fluoride (LaF3) and magnesium fluoride (MgF2). Extended bandwidth technology is utilized in designing this filter. The obtained filter has a high reflectance in the working wavelength range of 140–180 nm, meanwhile, with good suppression in shorter and longer wavelength regions. In 2016, this filter was employed in a wide-angle aurora imager (WAAI) installed in the Feng Yun III satellite that will be launched in China.

scholarly journals Analysis of UV spectrophotometric observations for O-type stars.

1979 ◽  
Vol 83 ◽  
pp. 109-112
Author(s):  
Carlo Morossi ◽  
Roberto Stalio ◽  
Lucio Crivellari
Keyword(s):  
Wavelength Range ◽  
Spectral Resolution ◽  
Bright Star ◽  
Stellar Spectra ◽  
Different Temperatures ◽  
Far Ultraviolet

The ESA “Ultraviolet Bright Star Spectrophotometric Catalogue” (Jamar et al. 1976) and the “Catalogue of 0.2 A Resolution Far-ultraviolet Stellar Spectra Measured with Copernicus” (Snow and Jenkins 1976) have been used to try to separate, by means of simple diagrams, O-type stars belonging to different luminosity classes and having different temperatures. The ESA catalogue gives absolute fluxes for 43 O-type stars, mostly reddened, with a spectral resolution of 35–40 A, depending on the channel, in the wavelength range 1350–2550 A. The Copernicus catalogue gives spectra between 1000 and 1450 A for 17 O-type stars, with low reddening, at 0.2 A resolution.

scholarly journals Optical Measurements on Solids of Possible Interstellar Importance

1973 ◽  
Vol 52 ◽  
pp. 297-301 ◽  
Author(s):  
Donald R. Huffman ◽  
James L. Stapp
Keyword(s):  
Optical Properties ◽  
Wavelength Range ◽  
Optical Constants ◽  
Near Infrared ◽  
Large Change ◽  
Optical Measurements ◽  
Ultraviolet A ◽  
Peculiar Characteristic ◽  
Far Ultraviolet

Optical constants of olivine – (Mg, Fe)2SiO4 and magnetite – Fe3O4 are presented for the wavelength range from near infrared to far ultraviolet. A feature occurs in the optical constants of olivine at about 1460 Å, but no structure that could give rise to a 2200 Å interstellar feature is found. The most peculiar characteristic of the magnetite results is the large change of optical properties with temperature in the infrared.

scholarly journals Recent Techniques in Solar Optical Astronomy from Space

1968 ◽  
Vol 1 ◽  
pp. 75-93
Author(s):  
E.M. Reeves
Keyword(s):  
Present State ◽  
Optical Materials ◽  
Space Research ◽  
Photographic Film ◽  
Ultraviolet Detectors ◽  
Solar Observations ◽  
Current State ◽  
Instrument Technology ◽  
Far Ultraviolet ◽  
Optical Astronomy

AbstactThe article summarizes some of the recent advances in the techniques of solar space research, particularly over the last 4 years, in an attempt to review the current state of instrument technology. The present state of development in rocket and satellite vehicles for solar observations, far ultraviolet detectors, optical materials, ultraviolet reflection coatings, filters, and photographic film fogging, are among the topics described.

Geometrical-based quasi-aspheric surface description and design method for miniature, low-distortion, wide-angle camera lens

2020 ◽  
Vol 59 (27) ◽  
pp. 8408
Author(s):  
Zhenfeng Zhuang ◽  
Xavier Dallaire ◽  
Jocelyn Parent ◽  
Patrice Roulet ◽  
Simon Thibault
Keyword(s):  
Design Method ◽  
Wide Angle ◽  
Aspheric Surface ◽  
Camera Lens ◽  
Surface Description ◽  
Low Distortion ◽  
Wide Angle Camera

Design Method of a Broadband Wide-Angle Plasmonic Absorber in the Visible Range

Plasmonics ◽  
2016 ◽  
Vol 12 (1) ◽  
pp. 117-124 ◽  
Author(s):  
Xianshun Ming ◽  
Qiaofeng Tan
Keyword(s):  
Design Method ◽  
Visible Range ◽  
Wide Angle

scholarly journals Far Ultraviolet Observations of Hot DA White Dwarfs

1989 ◽  
Vol 114 ◽  
pp. 139-143 ◽  
Author(s):  
David Finley ◽  
Gibor Basri ◽  
Stuart Bowyer
Keyword(s):  
Wavelength Range ◽  
White Dwarfs ◽  
Time Dependent ◽  
Flux Correction ◽  
V Band ◽  
International Ultraviolet Explorer ◽  
Effective Temperatures ◽  
Far Ultraviolet ◽  
Ultraviolet Observations ◽  
Flux Calibration

AbstractFar ultraviolet (FUV) fluxes have been used for determining the effective temperatures of a number of DA white dwarfs hotter than 20,000 K. The spectra were obtained with the International Ultraviolet Explorer (IUE). The analysis consisted of comparing the observed FUV fluxes with model fluxes scaled to the V-band flux. After suitable corrections were performed for the time-dependent sensitivity degradation of the IUE, it was found that the available flux calibrations for the IUE were insufficiently accurate for precise temperature determinations. Accordingly, we used seven white dwarfs for which accurate, independent temperature determinations have been made from line profile analyses to improve the accuracy of the IUE flux calibration. The correction to the original calibration was as great as 20% in individual 5-Å wavelength bins, while the average over the IUE wavelength range was 5%. We present both our IUE flux correction and the temperatures obtained for the hot white dwarfs.

scholarly journals Cascaded Nanorod Arrays for Ultrabroadband, Omnidirectional and Polarization-Insensitive Absorption

2020 ◽  
Vol 10 (11) ◽  
pp. 3878
Author(s):  
Xun Wang ◽  
Tian Sang ◽  
Honglong Qi ◽  
Guoqing Li ◽  
Xin Yin ◽  
...  
Keyword(s):  
Wavelength Range ◽  
Near Infrared ◽  
Structural Parameters ◽  
Resonant Cavity ◽  
Dielectric Materials ◽  
Localized Surface Plasmon ◽  
Nanorod Arrays ◽  
Absorption Properties ◽  
Polarization Insensitive ◽  
Absorption Performance

An ultrabroadband, omnidirectional, and polarization-insensitive absorber based on cascaded nanorod arrays (CNAs) is numerically demonstrated, and an average absorptivity of 98.2% with a relative absorption bandwidth (RAB) of 149.8% can be achieved in the 0.38–2.65 μm wavelength range. The proposed CNA-based absorber requires only several pairs of multilayers to achieve excellent absorption performance. More significantly, the physical mechanism for this intriguing ultrabroadband absorption results from the synergistic effect of localized surface plasmon (LSP) and plasmonic resonant cavity (PRC) modes, which is fundamentally different from the tapered metal/dielectric multilayer-based absorbers associated with the slow-light mode. We investigated the absorption properties of the CNA-based metasurface by using the impedance theory, which indicates that the impedance of the structure matches well with the impedance of the free space from the visible to near-infrared wavelength range. In addition, the absorption properties of the CNA-based metasurface are robust to the variation of the structural parameters and the metal/dielectric materials, and ultrabroadband absorption performance can be maintained within 0–60° for both TM and TE modes.

Nitride-Based LEDs With High-Reflectance and Wide-Angle Ag Mirror${+}$SiO$_{2}$/TiO$_{2}$ DBR Backside Reflector

2011 ◽  
Vol 29 (7) ◽  
pp. 1033-1038 ◽  
Author(s):  
Nan-Ming Lin ◽  
Shih-Chang Shei ◽  
Shoou-Jinn Chang
Keyword(s):  
Wide Angle ◽  
High Reflectance
Sign in / Sign up

Export Citation Format

Share Document