Semianalytical design of antireflection gratings for photonic crystals

Semianalytical design of antireflection gratings for photonic crystals

Antireflection gratings for a photonic-crystal flat lens.

A dielectric structure with effective permittivity and permeability close to -1 operating for propagative waves at optical wavelengths is proposed. This structure is a two-dimensional photonic crystal with refractive index -1, coated by appropriate antireflection gratings. Numerical simulations involving a flat lens made of this optimized crystal illustrate the improvements that antireflection ...

Resonant cavity based compact efficient antireflection structures for photonic crystals

We propose an effective admittance (EA) method to design antireflection structures for two-dimensional photonic crystals (PCs). We demonstrate that a compact and efficient antireflection structure, which is difficult to obtain by the conventional admittance matching method, can be readily designed by the EA method. The antireflection structure consists of an air slot resonant cavity that is con...

Systematic Design of Antireflection Coating for One-dimensional Photonic Crystals Using Bloch Wave Expansion

We present a systematic method for designing a perfect antireflection coating (ARC) of a one-dimensional (1D) photonic crystal (PC) with an arbitrary unit cell. We use Bloch wave expansion and time reversal symmetry, which leads exactly to analytic formulas of structural parameters for the ARC and renormalized Fresnel coefficients of the PC. Surface immittance (admittance and impedance) matchin...

Antireflection and Enhanced Absorption in Tapered Silicon Photonic Crystals

Tapered silicon photonic crystals provide a broad and wide-angle antireflective window and strong optical resonances for enhanced absorption for TEand TM-polarized light, respectively, showing the potential for improving the performance of photovoltaic devices. 2010 Optical Society of America OCIS codes: (050.5298) Photonic crystals; (160.4760) Optical properties ; (220.4241) Nanostructure fab...