Digitally reconfigurable complex 2D Dual lattice structure by optical phase engineering

摘要

We present a method to combine two periodic lattice wave-fields to generate acomplex dual lattice wave-field which could be employed for microfabrication ofcorresponding 2D dual lattice structures. Since the addition of two periodiclattice wave-fields is coherent in nature the resultant dual lattice structureis highly dependent on the relative phase difference between constituentwave-fields. We show that it is possible to have control over the dual latticepattern by precisely controlling this relative phase difference. This controlis enabled by making use of digitally addressable phase only spatial lightmodulator (SLM). We provide the computational method for calculation ofcorresponding phase mask to be displayed on the SLM and also verify the resultsexperimentally by employing a simple 4f Fourier filter based geometry. Themethod is completely scalable and reconfigurable in terms of the choice ofperiodic lattice wave-fields and has the potential to form gradient phase maskswhich could be useful for fabrication of graded index optical components.