title: Invariance of waveguide grating mirrors to lateral displacement phase shifts.
abstract: We present a method to analyze the coupling of lateral displacements in nanoscale structures, in particular waveguide grating mirrors (WGMs), into the phase of a reflected Gaussian beam using a finite-difference time-domain simulation. Such phase noise is of interest for using WGMs in high-precision interferometry. We show that, to the precision of our simulations (10(-7) rad), waveguide mirrors do not couple lateral displacement into phase noise of a reflected beam and that WGMs are therefore not subject to the same stringent alignment requirements as previously proposed layouts using diffraction gratings.
authors.affiliation: University of Birmingham, School of Physics and Astronomy, Edgbaston, Birmingham B15 2TT, UK. ddb@star.sr.bham.ac.uk
authors.forename: Daniel
authors.initials: D
authors.lastname: Brown
authors.forename: Daniel
authors.initials: D
authors.lastname: Friedrich
authors.forename: Frank
authors.initials: F
authors.lastname: Brückner
authors.forename: Ludovico
authors.initials: L
authors.lastname: Carbone
authors.forename: Roman
authors.initials: R
authors.lastname: Schnabel
authors.forename: Andreas
authors.initials: A
authors.lastname: Freise