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A biomimicry design for nanoscale radiative cooling applications inspired by Morpho didius butterfly

Title	A biomimicry design for nanoscale radiative cooling applications inspired by Morpho didius butterfly
Author	Didari, Azadeh, Mengüç, Mustafa Pınar
Publication Date:	2018-11-15
Publication Place	- Nature Publishing Group
Subject	Selective surfaces, Photonic crystals, Perfect absorber, Wing scales, Absorption, Films, Field, Plasmons
Type	Periodical
Language	English
Digital	Yes
Manuscript	No
Library:	Özyeğin University
Library Asset ID	2045-2322
Record ID	ef5c50e5-eec0-441a-a7ad-97e175912085
Library Location	Mechanical Engineering
Date	2018-11-15
Notes	TÜBİTAK ; Ozyegin University
Sample Text	In nature, novel colors and patterns have evolved in various species for survival, recognizability or mating purposes. Investigations of the morphology of various butterfly wings have shown that in addition to the pigmentation, micro and nanostructures within the wings have also allowed better communication systems and the pheromone-producing organs which are the main regulators of the temperature within butterfly wings. Within the blue spectrum (450–495 nm), Morpho didius butterfly exhibit iridescence in their structure-based wings’ color. Inspired by the rich physics behind this concept, we present a designer metamaterial system that has the potential to be used for near-field radiative cooling applications. This biomimicry design involves SiC palm tree-like structures placed in close proximity of a thin film in a vacuum environment separated by nanoscale gaps. The near-field energy exchange is enhanced significantly by decreasing the dimensions of the tree and rotating the free-standing structure by 90 degrees clockwise and bringing it to the close proximity of a second thin film. This exchange is calculated by using newly developed near-field radiative transfer finite difference time domain (NF-RT-FDTD) algorithm. Several orders of enhancement of near-field heat flux within the infrared atmospheric window (8–13 μm bandwidth) are achieved. This spectrally selective enhancement is associated with the geometric variations, the spatial location of the source of excitation and the material characteristics, and can be tuned to tailor strong radiative cooling mechanisms.
DOI	10.1038/s41598-018-35082-3
Cilt	8

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Özyeğin University

A biomimicry design for nanoscale radiative cooling applications inspired by Morpho didius butterfly

Author Didari, Azadeh, Mengüç, Mustafa Pınar

Publication Date 2018-11-15

Publication Place - Nature Publishing Group

Subject Selective surfaces, Photonic crystals, Perfect absorber, Wing scales, Absorption, Films, Field, Plasmons

Type Periodical

Language English

Digital Yes

Manuscript No

Library Özyeğin University

Library Asset ID 2045-2322

Record ID ef5c50e5-eec0-441a-a7ad-97e175912085

Library Location Mechanical Engineering

Date 2018-11-15

Notes TÜBİTAK ; Ozyegin University

Sample Text In nature, novel colors and patterns have evolved in various species for survival, recognizability or mating purposes. Investigations of the morphology of various butterfly wings have shown that in addition to the pigmentation, micro and nanostructures within the wings have also allowed better communication systems and the pheromone-producing organs which are the main regulators of the temperature within butterfly wings. Within the blue spectrum (450–495 nm), Morpho didius butterfly exhibit iridescence in their structure-based wings’ color. Inspired by the rich physics behind this concept, we present a designer metamaterial system that has the potential to be used for near-field radiative cooling applications. This biomimicry design involves SiC palm tree-like structures placed in close proximity of a thin film in a vacuum environment separated by nanoscale gaps. The near-field energy exchange is enhanced significantly by decreasing the dimensions of the tree and rotating the free-standing structure by 90 degrees clockwise and bringing it to the close proximity of a second thin film. This exchange is calculated by using newly developed near-field radiative transfer finite difference time domain (NF-RT-FDTD) algorithm. Several orders of enhancement of near-field heat flux within the infrared atmospheric window (8–13 μm bandwidth) are achieved. This spectrally selective enhancement is associated with the geometric variations, the spatial location of the source of excitation and the material characteristics, and can be tuned to tailor strong radiative cooling mechanisms.

DOI 10.1038/s41598-018-35082-3

Cilt 8