Metal-clad waveguide as cutoff polarizer for integrated optics

Abstract

141to DFB and DBR lasers as well as orthogonal radiation from grating couplers. Solutions for all Bragg orders up to the fourth and various blazing angles of a triangular grating were given and applied to determine reflection for a DBR laser and longitudinal mode thresholds and wavelengths in a DFB laser.

Surface Plasmon Modes of Dielectric-Metal-Dielectric Waveguides and Applications

“…The effective index of these modes is a strong function of metal thickness in the low contrast region and hence this can be tuned by the change in metal thickness. This property has been used in the early polarizer designs [5]. It is this mode which also plays a vital role in the recently designed polarizers for silicon on insulator (SOI) waveguide [13].…”

“…A metal-cladplasmonic waveguide can be designed to act as a polarizer in integrated optical circuits [3][4][5][6]12,13]. The metallic layer provides polarization discrimination because losses for TM modes were higher than losses for TE polarized modes due to penetration of the TM fields into the metal.…”

“…However, for thin metal films these modes get coupled and the film can support one or two lossy bound surface plasmon TM modes depending on the metal thickness and dielectric constants of the two dielectric media. Such dielectric-metal-dielectricplasmonic waveguide structures find applications in integrated optic and fiber polarizers [3][4][5][6][7] and sensors [8]. Surface plasmon waves guided by thin metal films on the dielectrics have been intensively studied over the last two decades [9,10].…”

Two and One Dimensional Dielectric Waveguides

“…It can be shown that he effective mode index of the TE mode is usually less than that of the TM mode. Therefore, an effective decrease in the waveguide refractive index, or it thickness, would cut-off the TE mode before cutting-off the TM mode [7,8].…”

Conducting Sheath Helical Winding on the Core-Cladding Interface of a Lightguide Having a Piet Hein Super Elliptical Core Cross-Section and a Standard Optical Fiber of Circular Cross-Section-a Comparative Modal Analysis

“…Recently metal-clad optical waveguides [13][14][15][16][17][18] have been studied theoretically, experimentally and technically because these provide potential applications, such as connecting the optical components to other circuits, protecting the optical devices against stray light and heat sinking. Metallic -cladding structure on an optical waveguide is known as a TE-mode pass polarizer and is commercially applied to various optical devices [16,17].…”