Microwave absorptions of ultrathin conductive films and designs of frequency-independent ultrathin absorbers | Zendy

Sucheng Li | Zendy; Shahzad Anwar | Zendy; Weixin Lu | Zendy; Zhi Hong Hang | Zendy; Bo Hou | Zendy; Mingrong Shen | Zendy; Chinhua Wang | Zendy

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Microwave absorptions of ultrathin conductive films and designs of frequency-independent ultrathin absorbers

Author(s) -

Sucheng Li,

Shahzad Anwar,

Weixin Lu,

Zhi Hong Hang,

Bo Hou,

Mingrong Shen,

Chinhua Wang

Publication year - 2014

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4863921

Subject(s) - materials science , microwave , absorbance , absorption (acoustics) , electrical conductor , impedance matching , optoelectronics , electrical impedance , optics , sheet resistance , composite material , layer (electronics) , computer science , telecommunications , physics , quantum mechanics

We study the absorption properties of ultrathin conductive films in the microwave regime, and find a moderate absorption effect which gives rise to maximal absorbance 50% if the sheet (square) resistance of the film meets an impedance matching condition. The maximal absorption exhibits a frequency-independent feature and takes place on an extremely subwavelength scale, the film thickness. As a realistic instance, ∼5 nm thick Au film is predicted to achieve the optimal absorption. In addition, a methodology based on metallic mesh structure is proposed to design the frequency-independent ultrathin absorbers. We perform a design of such absorbers with 50% absorption, which is verified by numerical simulations

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