1.5-μ m -wavelength light guiding in waveguides in square-lattice-of-rod photonic crystal slab

Abstract

We have experimentally demonstrated the guiding of light at a 1.5 μm wavelength in straight and 90°-bent line-defect waveguides in two-dimensional square-lattice-of-rods photonic crystal slabs. The light was guided by being confined in a row of the rods that were thinner than the surrounding ones. A new structural design to greatly facilitate their fabrication process without degrading the guiding property was used. The propagation loss measured for a 1.8-mm-straight waveguide was 4.8 dB/mm, which is small enough to allow us to proceed to integrated optical circuit application.

Selective lasing in multimode periodic and non‐periodic nanopillar waveguides

“…As a consequence, the lasing performance in such structures is expected to be greater, as conjectured by us earlier [14]. Note that the nanopillar-based structures in the wavelength range considered (1 ÷ 1.5 µm) are within the state-of-the-art fabrication possibilities, both in sandwich-like [6] and in membrane-like [18] geometry.…”

“…Creating a line defect in a PhC structure, e.g., by removing or modifying one or several lines of scatterers from the PhC periodic lattice, produces a photonic crystal waveguide (PCW). Various designs of a PCW in two-dimensional geometry have been reported, based both on air hole lattices in a dielectric background and on dielectric rods in air [4][5][6]. Numerous works have been dedicated to the optimization of PCW-based integrated optical devices, such as bends, splitters, couplers, etc.…”

Coupled Nanopillar Waveguides: Optical Properties and Applications

“…For example, two-dimensional (2D) silicon-on-insulator (SOI) pillar PhC have recently been fabricated and characterized [10]. Sandwichlike structures have also been successfully realized in GaAs/Al x O y material system [11].…”

Coupling techniques between dielectric waveguides and planar photonic crystals.

“…However, the sidewall roughness depends on the optimization of the fabrication process. In fact, low propagation losses (below 5dB/mm) comparable to those obtained in hole structures have been recently reported in a rod structure similar to that used in this work [Tok04]. Another important difference between hole and rod structures is the index contrast between the waveguide and the surrounding lattice in the horizontal dimension.…”