Plasmonic blackbody: Almost complete absorption of light in nanostructured metallic coatings

2008 ◽  
Vol 78 (20) ◽  
Author(s):  
V. G. Kravets ◽  
F. Schedin ◽  
A. N. Grigorenko
Keyword(s):  
Metallic Coatings ◽  
Absorption Of Light ◽  
Complete Absorption

Almost Complete Absorption of Light in Nanostructured Metallic Coatings: Blackbody Behavior

PIERS Online ◽  
2009 ◽  
Vol 5 (4) ◽  
pp. 397-400 ◽  
Author(s):  
Vasyl G. Kravets ◽  
Fred Schedin ◽  
A. N. Grigorenko
Keyword(s):  
Metallic Coatings ◽  
Absorption Of Light ◽  
Complete Absorption

scholarly journals Super black eyespots of the Eyed elater

2019 ◽  
Author(s):  
Victoria L Wong ◽  
Paul E Marek
Keyword(s):  
Incident Light ◽  
Natural World ◽  
Surface Structures ◽  
Anatomical Structures ◽  
Scattering Of Light ◽  
Click Beetle ◽  
Absorption Of Light ◽  
Complete Absorption ◽  
Vertically Aligned ◽  
Scatter Light

Scattering of light by surface structures leading to near complete structural absorption creates an appearance of “super black.” Well known in the natural world from bird feathers and butterfly scales, super black has evolved independently from various anatomical structures. Due to an exceptional ability to harness and scatter light, these biological materials have garnered interest from optical industries. Here we describe the false eyespots of the Eyed elater click beetle, which attains near complete absorption of light by an array of vertically-aligned microtubules. These cone-shaped microtubules are modified hairs (setae) that are localized to eyespots on the dorsum of the beetle, and absorb 96.1% of incident light (at a 24.8° collection angle) in the spectrum between 300 – 700 nm.

scholarly journals Structure and pigment make the eyed elater’s eyespots black

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e8161 ◽  
Author(s):  
Victoria L. Wong ◽  
Paul E. Marek
Keyword(s):  
Specular Reflection ◽  
Incident Light ◽  
Natural World ◽  
Multiple Reflections ◽  
Anatomical Structures ◽  
Click Beetle ◽  
Combine Structure ◽  
Absorption Of Light ◽  
Complete Absorption ◽  
Vertically Aligned

Surface structures that trap light leading to near complete structural absorption creates an appearance of “super black.” Well known in the natural world from bird feathers and butterfly scales, super black has evolved independently from various anatomical structures. Due to an exceptional ability to reduce specular reflection, these biological materials have garnered interest from optical industries. Here we describe the false eyes of the eyed elater click beetle, which, while not classified as super black, still attains near complete absorption of light partly due to an array of vertically-aligned microtubules. These cone-shaped microtubules are modified hairs (setae) that are localized to eyespots on the dorsum of the beetle, and absorb 96.1% of incident light (at a 24.8° collection angle) in the spectrum between 300–700 nm. Filled with melanin, the setae combine structure and pigment to generate multiple reflections and refractions causing light to travel a greater distance. This light-capturing architecture leaves little light available to receivers and the false eyes appear as deep black making them appear more conspicuous to predators.

scholarly journals Super black eyespots of the Eyed elater

2019 ◽  
Author(s):  
Victoria L Wong ◽  
Paul E Marek
Keyword(s):  
Incident Light ◽  
Natural World ◽  
Surface Structures ◽  
Anatomical Structures ◽  
Scattering Of Light ◽  
Click Beetle ◽  
Absorption Of Light ◽  
Complete Absorption ◽  
Vertically Aligned ◽  
Scatter Light

Scattering of light by surface structures leading to near complete structural absorption creates an appearance of “super black.” Well known in the natural world from bird feathers and butterfly scales, super black has evolved independently from various anatomical structures. Due to an exceptional ability to harness and scatter light, these biological materials have garnered interest from optical industries. Here we describe the false eyespots of the Eyed elater click beetle, which attains near complete absorption of light by an array of vertically-aligned microtubules. These cone-shaped microtubules are modified hairs (setae) that are localized to eyespots on the dorsum of the beetle, and absorb 96.1% of incident light (at a 24.8° collection angle) in the spectrum between 300 – 700 nm.

Absorption of light in antiferromagnetic dielectrics

1969 ◽  
Vol 98 (5) ◽  
pp. 27-70 ◽  
Author(s):  
V.V. Eremenko ◽  
A.I. Belyaeva
Keyword(s):  
Absorption Of Light

Low-pressure cold metal spray coatings for repair and protection of marine components

2018 ◽  
Author(s):  
M Pal
Keyword(s):  
Marine Environment ◽  
Alloy Coating ◽  
Al Alloy ◽  
Metallic Coatings ◽  
Material State ◽  
Paint Coatings ◽  
And Performance ◽  
Cuzn Alloy ◽  
Cold Metal ◽  
Metal Spray

The marine environment is hostile to most engineering materials, a combination of in-service wear and exposure to marine environment leads to an accelerated material degradation.  Insufficient or poor protection of the substrates further assists the accelerated material degradation in marine environment. There is a direct relationship between the material-state of a ship and its operational capability, readiness, and service life.  The current state-of-the-art practice is to use paint-based coatings to maintain the material-state of ships.  However, the protection offered by paint coatings is usually brief due to inherent permeability and low damage tolerance of these coatings.  For this reason, the paint coatings require renewal at regular intervals, typically less than 5-years, to maintain a minimum level of protection from the marine environment.  The need for regular painting of ships results in a significant negative impact on the through-life availability, operational capability/readiness, and the cost of maintenance/operation of naval ships.  Therefore, the fleet owners and operators should look beyond the conventional paint-based coatings to achieve significant breakthrough improvements in maintaining and enhancing the material-state of naval ships. Metallic coatings, if selected and applied appropriately, will outperform the paint coatings in the marine environment.  Historically, the cost and performance of metallic coatings, mainly thermal metal spray (TMS) coatings, prevented their widespread use in the marine industry.  The TMS coatings also have their own inherent application and performance related limitations that are widely reported in the literature.  However, the cold metal spray (CMS) coating process can overcome the application and performance related limitations that are typically associated with the TMS coatings, therefore creating an opportunity for widespread use of metallic coatings in shipbuilding and fleet upkeep/maintenance. In this paper, the ability of low-pressure (LP-CMS) coatings to repair and reclaim damaged marine components, and application of functional coatings to improve in-service damage tolerance of the damaged/new components is investigated.  The results of the investigation show that two LP-CMS coatings, Al-alloy and CuZn-alloy, can be used to repair and preserve both new and damaged components.  The accelerated salt-spray and natural immersion corrosion testing of the LP-CMS coatings showed that each coating will be better suited to a particular operational environment, i.e. CuZn-alloy coating performed well in both immersion and atmospheric corrosion environments, whereas Al-alloy coating performed well only in atmospheric corrosion environment. 

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