Title :
Compact Bidirectional Polarization Splitting Antenna
Author :
Lu, Fan ; Li, Guangyuan ; Xiao, Feng ; Xu, Anshi
Author_Institution :
State Key Lab. of Adv. Opt. Commun. Syst. & Networks, Peking Univ., Beijing, China
Abstract :
A compact bidirectional polarization splitting antenna (BPSA) composed of a patterned metallic structure coated by a thin dielectric film is proposed and theoretically investigated. Using a polarization-selective array of grooves, the backside illuminated light transmitted through the central nanoslit is split and coupled into TM- and TE-polarized modes supported by the metal-dielectric-air (MDA) configuration. The operation principle of the structure is clarified and theoretically illustrated by utilizing the fully vectorial aperiodic Fourier modal method (a-FMM). Numerical simulations show that insertion losses (ILs) less than 4 dB, polarization extinction ratios (PERs) better than 18 dB, and crosstalk (CR) less than -18 dB are achieved for both polarizations in the wavelength range 1510-1570 nm. The structure will find potential applications in highly integrated polarization diversity systems and photonic integrated circuit.
Keywords :
antennas; dielectric thin films; light polarisation; nanophotonics; numerical analysis; optical crosstalk; optical losses; TE-polarized modes; TM-polarized modes; backside illuminated light; central nanoslit; compact bidirectional polarization splitting antenna; crosstalk; grooves; insertion losses; metal-dielectric-air configuration; numerical simulations; patterned metallic structure; polarization-selective array; thin dielectric film; vectorial aperiodic Fourier modal method; wavelength 1510 nm to 1570 nm; Antennas; Arrays; Dielectrics; Mathematical model; Optical waveguides; Photonics; Plasmons; Engineered photonic nanostructures; micro and nano antennas; subwavelength structures;
Journal_Title :
Photonics Journal, IEEE
DOI :
10.1109/JPHOT.2012.2215020
