Angle- and polarization-insensitive, small area, subtractive color filters via a-Si nanopillar arrays (Conference Presentation)

2016 ◽  
Author(s):  
Katherine T. Fountaine ◽  
Mikinori Ito ◽  
Ragip Pala ◽  
Harry A. Atwater
Keyword(s):  
Small Area ◽  
Polarization Insensitive ◽  
Color Filters ◽  
Nanopillar Arrays

scholarly journals Ultra-broadband, lithography-free, omnidirectional, and polarization-insensitive perfect absorber

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Tse-An Chen ◽  
Meng-Ju Yub ◽  
Yu-Jung Lu ◽  
Ta-Jen Yen
Keyword(s):  
Mass Production ◽  
Near Infrared ◽  
Magnesium Fluoride ◽  
Perfect Absorber ◽  
Plasmonic Resonance ◽  
Practical Applications ◽  
Narrow Bandwidth ◽  
Thermal Emitters ◽  
Polarization Insensitive ◽  
Color Filters

AbstractPerfect absorbers (PAs) at near infrared allow various applications such as biosensors, nonlinear optics, color filters, thermal emitters and so on. These PAs, enabled by plasmonic resonance, are typically powerful and compact, but confront inherent challenges of narrow bandwidth, polarization dependence, and limited incident angles as well as requires using expensive lithographic process, which limit their practical applications and mass production. In this work, we demonstrate a non-resonant PA that is comprised of six continuous layers of magnesium fluoride (MgF2) and chromium (Cr) in turns. Our device absorbs more than 90% of light in a broad range of 900–1900 nm. In addition, such a planar design is lithography-free, certainly independent with polarization, and presents a further advantage of wide incidence up to 70°. The measured performance of our optimized PA agrees well with analytical calculations of transfer matrix method (TMM) and numerical simulations of finite element method, and can be readily implemented for practical applications.

scholarly journals Ultra-Broadband, Lithography-Free, Omnidirectional, and Polarization-Insensitive Perfect Absorber

2020 ◽  
Author(s):  
Tse-An Chen ◽  
Meng-Ju Yub ◽  
Yu-Jung Lu ◽  
Ta-Jen Yen
Keyword(s):  
Mass Production ◽  
Near Infrared ◽  
Magnesium Fluoride ◽  
Perfect Absorber ◽  
Plasmonic Resonance ◽  
Practical Applications ◽  
Narrow Bandwidth ◽  
Thermal Emitters ◽  
Polarization Insensitive ◽  
Color Filters

Abstract Perfect absorbers (PAs) at near infrared allow various applications such as biosensors, nonlinear optics, color filters, thermal emitters and so on. These PAs, enabled by plasmonic resonance, are typically powerful and compact, but confront inherent challenges of narrow bandwidth, polarization dependence, and limited incident angles as well as requires using expensive lithographic process, which limit their practical applications and mass production. In this work, we demonstrate a non-resonant PA that is comprised of six continuous layers of magnesium fluoride (MgF2) and chromium (Cr) in turns. Our device absorbs more than 90% of light in a broad range of 900-1900 nm. In addition, such a planar design is lithography-free, certainly independent with polarization, and presents a further advantage of wide incidence up to 70°. The measured performance of our optimized PA agrees well with analytical calculations of transfer matrix method (TMM) and numerical simulations of finite element method, and can be readily implemented for practical applications.

Rocking Beam Microarea Diffraction Applied to Metallic thin Films

1976 ◽  
Vol 34 ◽  
pp. 396-397
Author(s):  
R. H. Geiss
Keyword(s):  
Thin Films ◽  
Electron Diffraction ◽  
Small Area ◽  
Objective Lens ◽  
Electron Optics ◽  
Metallic Thin Films ◽  
Transmission Electron Diffraction ◽  
Transmission Electron ◽  
Sample Height ◽  
Scanning Transmission

The theory and practical limitations of micro area scanning transmission electron diffraction (MASTED) will be presented. It has been demonstrated that MASTED patterns of metallic thin films from areas as small as 30 Åin diameter may be obtained with the standard STEM unit available for the Philips 301 TEM. The key to the successful application of MASTED to very small area diffraction is the proper use of the electron optics of the STEM unit. First the objective lens current must be adjusted such that the image of the C2 aperture is quasi-stationary under the action of the rocking beam (obtained with 40-80-160 SEM settings of the P301). Second, the sample must be elevated to coincide with the C2 aperture image and its image also be quasi-stationary. This sample height adjustment must be entirely mechanical after the objective lens current has been fixed in the first step.

Small area variations and socio-demographic correlates for the incidence of Crohn s disease and ulcerative colitis

2001 ◽  
Vol 120 (5) ◽  
pp. A458-A458
Author(s):  
J BLANCHARD ◽  
A WAJDA ◽  
P RAWSTHORNE ◽  
C BERNSTEIN
Keyword(s):  
Ulcerative Colitis ◽  
Small Area ◽  
Demographic Correlates

Continuity or change?

2015 ◽  
Vol 1 (2) ◽  
pp. 243-271 ◽  
Author(s):  
Liz Henty
Keyword(s):  
Bronze Age ◽  
Small Area ◽  
Economic Changes ◽  
Neolithic Transition ◽  
The Bronze Age

General archaeological accounts of Scotland tend to demonstrate broad ideas of the Neolithic transition to farming and the subsequent economic changes in the Bronze Age. Whilst they concentrate on important economic and cultural advancement they tend to lack discussions on cosmological change. This paper looks at one small area in Aberdeenshire to examine four different classes of monument that are found there: long mounds and long cairns; Recumbent Stone Circles; henges and Beaker burial sites. It argues that skyscape archaeology, through the use of archaeoastronomical techniques, can provide clues to cosmological change.

Sign in / Sign up

Export Citation Format

Share Document