Metamaterial Absorber for Electromagnetic Waves in Periodic Water Droplets.
Perfect metamaterial absorber (PMA) can intercept electromagnetic wave harmful for body in Wi-Fi, cell phones and home appliances that we are daily using and provide stealth function that military fighter, tank and warship can avoid radar detection. We reported new concept of water droplet-based PMA absorbing perfectly electromagnetic wave with water, an eco-friendly material which is very plentiful on the earth. If arranging water droplets with particular height and diameter on material surface through the wettability of material surface, meta-properties absorbing electromagnetic wave perfectly in GHz wide-band were shown. It was possible to control absorption ratio and absorption wavelength band of electromagnetic wave according to the shape of water droplet-height and diameter- and apply to various flexible and/or transparent substrates such as plastic, glass and paper. In addition, this research examined how electromagnetic wave can be well absorbed in water droplets with low electrical conductivity unlike metal-based metamaterials inquiring highly electrical conductivity. Those results are judged to lead broad applications to variously civilian and military products in the future by providing perfect absorber of broadband in all products including transparent and bendable materials.
Department of Physics and RINS, Hanyang University, Seoul, South Korea.
Young Joon
YJ
Yoo
Department of Physics, Kyonggi University, Suwon, South Korea.
Sanghyun
S
Ju
Advanced Institutes of Convergence Technology, Seoul National University, Suwon, South Korea.
Sang Yoon
SY
Park
Department of Physics and RINS, Hanyang University, Seoul, South Korea.
Young
Y
Ju Kim
Department of Physics, Kyonggi University, Suwon, South Korea.
Jihye
J
Bong
Department of Physics, Kyonggi University, Suwon, South Korea.
Taekyung
T
Lim
Department of Display Information, Sunmoon University, Asan, South Korea.
Ki Won
KW
Kim
Department of Physics, Sungkyunkwan University, Suwon, South Korea.
Joo Yull
JY
Rhee
Department of Physics and RINS, Hanyang University, Seoul, South Korea.
YoungPak
Y
Lee