title: Tunable spectral shifts and spectral switches by controllable phase modulation.
abstract: In this work, we offer a novel and flexible approach of spectral switches which can be handled more simply by controlling the phase of the diffracted light field of a completely spatially coherent incident beam with spectral profile from a one-dimensional phase step. This scheme has the benefit of easy implementation by simply varying the height of a one-dimensional phase step which causes spectral switches to occur when the step height reaches certain critical values without modulating any properties of the light source. To illustrate this effect, an explicit and analytical expression at an observation point corresponding to the step edge is obtained and some numerical examples are given and examined experimentally. Finally, based on the obtained results, it is shown that this method with the capability of very short response time can be easily applied to information encoding and transmission.
authors.affiliation: Physics Department, Bu-Ali Sina University, Hamedan 65174, Iran. amiri@iasbs.ac.ir
authors.forename: Mohammad
authors.initials: M
authors.lastname: Amiri
authors.forename: Mohammad Taghi
authors.initials: MT
authors.lastname: Tavassoly
authors.forename: Hajir
authors.initials: H
authors.lastname: Dolatkhah
authors.forename: Zahra
authors.initials: Z
authors.lastname: Alirezaei