Related Experiment Video
Updated: Jan 25, 2026

Writing Bragg Gratings in Multicore Fibers
Published on: April 20, 2016
Perfect matching of concave diffraction grating with continuously circular Bragg mirrors on SOI platform
Abstract:
A concave diffraction grating (CDG), based on circular Bragg mirrors, was constructed on the 220 nm silicon-on-insulator (SOI) platform. This continuous and smooth dielectric mirror is employed to eliminate the extra scattering loss occurring at the connection with neighboring grating teeth. A perfect match between the Bragg condition and the grating condition was derived in order to determine the geometrical parameters of the grating profile. finite-difference time-domain (FDTD) simulation shows that the reflection of the designed Bragg mirror can be up to 99.7% over a broad bandwidth of 330 nm. And the grating with circular Bragg mirrors exhibits low insertion loss in a relatively high order of M=5 with some unwanted diffraction orders suppressed, thus creating a large dispersion while keeping compact structure.
Related Concept Videos
Interference and Diffraction
Sign Test for Matched Pairs
To conduct the sign test, we first calculate the differences in...
Catalytically Perfect Enzymes
Most enzymes...
Deformation in a Circular Shaft
X-ray Diffraction of Biological Samples
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are scattered by the electron clouds around the sample atoms. The X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...
Uniform Circular Motion

