Negative refraction and imaging properties of circular photonic crystals

We review the simulation work for the far-field focus and dispersionless anticrossing bands in two-dimensional (2D) photonic crystals. In a two-dimensional photonic-crystal-based concave lens, the far-field focus of a plane wave is given by the distance between the focusing point and the lens. Strong and good-quality far-field focusing of a transmitted wave, explicitly following the well-known wave-beam negative refraction law, can be achieved. The spatial frequency information of the Bloch mode in multiple Brillouin zones (BZs) is investigated in order to indicate the wave propagation in two different regions. When considering the photonic transmission in a 2D photonic crystal composed of a negative phase-velocity medium (NPVM), it is shown that the dispersionless anticrossing bands are generated by the couplings among the localized surface polaritons of the NPVM rods. The photonic band structures of the NPVM photonic crystals are characterized by a topographical continuous dispersion relationship accompanied by many anticrossing bands.

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NEGATIVE REFRACTION AND SUBWAVELENGTH FOCUSING USING PHOTONIC CRYSTALS

Modern Physics Letters B ◽

10.1142/s0217984904007803 ◽

2004 ◽

Vol 18 (25) ◽

pp. 1275-1291 ◽

Cited By ~ 4

Author(s):

EKMEL OZBAY ◽

KAAN GUVEN ◽

ERTUGRUL CUBUKCU ◽

KORAY AYDIN ◽

B. KAMIL ALICI

Keyword(s):

Optical Properties ◽

Photonic Crystals ◽

Negative Refraction ◽

Numerical Study ◽

Effective Index ◽

Index Of Refraction ◽

Far Field ◽

Two Dimensional ◽

Flat Lens ◽

Effective Index Of Refraction

In this article, we present an experimental and numerical study of novel optical properties of two-dimensional dielectric photonic crystals (PCs) which exhibit negative refraction. We investigate two mechanisms which utilize the band structure of the PC to generate a negative effective index of refraction (n eff <0) and demonstrate the negative refraction experimentally. To the isotropic extend of n eff , different PC slab structures are employed to focus the radiation of a point source. It is shown experimentally that the PC can generate an image of the source with subwavelength resolution in the vicinity of the PC interface. Using a different PC, one can also obtain a far field focusing. In the latter case, we explicitly show the flat lens behavior of the structure. These examples indicate that PC-based lenses can surpass limitations of conventional lenses and lead to novel optics applications.

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Optical properties of GaAs 2D Archimedean photonic lattice tiling with the p4g symmetry

Science of Sintering ◽

10.2298/sos0802167j ◽

2008 ◽

Vol 40 (2) ◽

pp. 167-173 ◽

Cited By ~ 1

Author(s):

Dj. Jovanovic ◽

R. Gajic ◽

K. Hingerl

Keyword(s):

Optical Properties ◽

Photonic Crystal ◽

Photonic Crystals ◽

Negative Refraction ◽

Group Symmetry ◽

Electromagnetic Propagation ◽

Space Group Symmetry ◽

Space Group ◽

Left Handedness ◽

Archimedean Lattice

In this paper we present our investigation of 2D Archimedean lattice photonic crystals with p4g space group symmetry. The structures are made of GaAs both as air holes and dielectric rods in air. In order to analyze the photonic crystal optical properties we performed calculations of the band structures, equi-frequency contours and electromagnetic propagation through the basic structures and waveguides. In addition, we investigated negative refraction and left-handedness in the p4g photonic crystal.

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