Quality-factor enhancement of Fano resonance in asymmetric-double-bar metamaterials by alternately arranging inversed unit cells in the optical region

Yuto Moritake; Yoshiaki Kanamori; Kazuhiro Hane

doi:10.1117/12.2078784

27 February 2015 Quality-factor enhancement of Fano resonance in asymmetric-double-bar metamaterials by alternately arranging inversed unit cells in the optical region

Yuto Moritake, Yoshiaki Kanamori, Kazuhiro Hane

Author Affiliations +

Proceedings Volume 9371, Photonic and Phononic Properties of Engineered Nanostructures V; 93710T (2015) https://doi.org/10.1117/12.2078784
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

Metamaterials are artificial structures with exotic electromagnetic response: negative refraction, sub-wavelength focusing, and so on. Although characteristics of metamaterials are almost determined by unit cell structure, coupling effects among unit cells also have an important role in engineering electromagnetic response of metamaterials. In this study, we investigated Q-factors of Fano resonance in optical metamaterials having alternate arrangement of inversed asymmetric double bars (ADBs) to study effects of neighboring unit cell. An ADB is a pair of metal bars with slightly different bar lengths. Fano resonance with a high Q-factor was excited because of small asymmetry of an ADB. Alternate arrangement of inversed unit cells, in which the positions of the long bar and the short bar in neighboring unit cells were interchanged each other, was introduced into ADB metamaterials and its effect on the Q-factor was investigated. ADB metamaterials were fabricated by a lift-off method and optical spectra were measured. The Q-factors of Fano resonance around a wavelength of 1500 nm were estimated from absorption peaks, and dependence of a degree of asymmetry was studied. The Q-factor had strong dependence of asymmetry. Moreover, the Q-factors for alternate arrangement of inversed unit cells were higher than that for normally periodic arrangement. The enhancement is qualitatively expressed by interaction of magnetic dipoles among neighboring unit cells.

Citation Download Citation

Yuto Moritake, Yoshiaki Kanamori, and Kazuhiro Hane "Quality-factor enhancement of Fano resonance in asymmetric-double-bar metamaterials by alternately arranging inversed unit cells in the optical region", Proc. SPIE 9371, Photonic and Phononic Properties of Engineered Nanostructures V, 93710T (27 February 2015); https://doi.org/10.1117/12.2078784

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
6 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Metamaterials

Phase modulation

Absorption

Magnetism

Resonance enhancement

Electromagnetism

Metals

Show All Keywords

Keywords/Phrases

Search In:

Publication Years