Biomedical Engineering Reference
In-Depth Information
Chapter 5
Unusual Optical Properties of Helical
Metallic Photonic Crystals and Chiral
Channels in Dielectric Photonic Crystals
Hongqiang Li,
a
Jian Wen Dong,
b
and Che Ting Chan
c
a
Key Laboratory of Advanced Micro-structure Materials, MOE, Departmentof Physics,
Tongji University, Shanghai 200092,China
b
StateKey Laboratory of OptoelectronicMaterials andTechnologies, School of Physics
and Engineering,Sun Yat-Sen University, Guangzhou510275,China
c
Departmentof Physics, The Hong Kong University of Science andTechnology,
Clear Water Bay, Hong Kong, China
phchan@ust.hk
In this chapter, we will show that a photonic crystal comprising
an array of subwavelength metallic helices has a unique photonic
dispersion that allows for the realization of negative refraction
for frequencies both above and below the polarization gap for
electromagnetic waves propagating along the helical axis. The
helicalphotoniccrystalcanalsoserveasabroadbandwaveplatefor
waves propagating perpendicular to the helical axis of the metallic
photonic crystal. In addition, we show that robust transport of light
can be achieved using chiral photonic guided modes in a channel of
