Eur. Phys. J. B (2012) 85: 232
https://doi.org/10.1140/epjb/e2012-30038-x

Regular Article

Tunable bandpass filters based on one-dimensional bilayer period structure composed of single-negative materials

¹ School of Scinece, Nanchang University, Nanchang 330031, P.R. China
² State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, P.R. China
³ State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen Unversity, Guangzhou 510275, P.R. China
⁴ Institute for Advanced Study, Nanchang University, Nanchang 330031, P.R. China

^a e-mail: xhdengxh@yahoo.com.cn

Received: 13 January 2012
Received in final form: 1 May 2012
Published online: 3 July 2012

Abstract

Polarization-independent and omnidirectional tunable bandpass filters have been proposed and demonstrated. It is seen that a bilayer period structure composed of single-negative materials can act as a tunable filter, which can be changed from a filter with two symmetrical passband to one with a single pass bandpass, or from one with a wide to one with a narrow pass band. Moreover, the proposed filter is insensitive to the incident angle and polarization of light, which is an omnidirectional, polarization-independent filter for incidence angles between 0° to 90°.