By exploiting the reflection phase properties of metamaterial reflectors, the authors propose a ethod to break the size restrictions imposed strictly on conventional cavities. They design the all-dimensional subwavelength cavities and perform experiments and simulations to demonstrate their subwavelength functionalities. For the smallest cavity that they fabricated, each dimension is only a quarter of the resonance wavelength.

We report our experimental and theoretical studies on a metamaterial substrate consisting of a quasi-periodic metallic planr pattern and a flat metal sheet, interconnected through metallic vias.We show that this structure possesses multiple in-phase reflection frequency regimes and spectral gaps for transverse-magnetic surface waves, whereas the transverse-electric surface waves are suppressed in all frequencies. In particular, an antenna put on top of this planar structure radiates with very high directivity sD=240d at some frequencies. This phenomenon is mainly governed by the inhomogeneity of the structure, which is a collective effect of perfect magnetic and electric conductors operating simultaneously at the frequency.

With proper structure, one-dimensional ~1D! binary nonperiodic dielectric multilayers can own compact strucuture and provide widely extended stop band from visible to infrared which is insensitive to the angle of incidence. The striking phenomenon attributes to the combining effect of Bragg reflection and light localization induced by disorder. The characteristic parameters to describe 1D binary nonperiodic dielectric multilayers are well defined. Material parameters of MgF2 and GaP are used to model 1D realistic device. Optimal design is suggested by comparison to binary 10/4 stack reflectors with the same optical length, number of layers and degree of disorder.

Two-dimensional structures of 28328 Teflon cylinders with average periodic square and rectangular latticesare prepared. The far-infrared spectra are measured at high-symmetry points of the structures and for s and pwaves, respectively, and the corresponding photonic bands are calculated. In most cases, the agreement between measurements and calculations is good. The influences of disorder upon the transmission spectra are observed. The unexpected transmission dips at the Mpoint of pwave and the very low transmittance in the high-frequency region are discussed.

We present an experimental study of the formation of two-dimensional optical lattices of titanium dioxide particles. The titanium dioxide particles, with an average size of 0.24mm and a high refractive index of 2.6-2.9 in the visible region, were trapped in the antinodes of a standing-wave field. The shortest lattice constant reached so far is 0.8mm. A corresponding diffraction pattern of the lattice was observed. This is an effort to create a photonic crystal with a lattice constant extended to visible and near-infrared wavelength scales.