Suppression of back reflection in a waveguide

摘要

A structure for guiding electromagnetic radiation, including: a substrate; a waveguide provided on the substrate and having a first end for receiving electromagnetic radiation and a second end; and an anti-reflection region provided at the second end of the waveguide on the substrate, the length and the width of the anti-reflection region being optimized to suppress back reflection of radiation that reaches the second end.

主权项

1. A structure for guiding electromagnetic radiation of a select wavelength, comprising: a substrate; a waveguide provided on the substrate and having a first end for receiving electromagnetic radiation of a select wavelength and a second end; and an anti-reflection region provided at the second end of the waveguide on the substrate, a length and a width of the anti-reflection region being selected to suppress back reflection of the electromagnetic radiation at the second end during operation, wherein the width of the anti-reflection region is substantially larger than the wavelength of the electromagnetic radiation in the anti-reflection region, and the length of the anti-reflection region is substantially longer than the wavelength of the electromagnetic radiation in the anti-reflection region, such that the anti-reflection region is configured to absorb the electromagnetic radiation and cause the electromagnetic radiation to diverge.