Abstract
A method for producing optical structures using rotationally symmetric pyramids is proposed. Two-dimensional structures can be achieved using acute prisms. They form by multi-beam interference of plane waves that impinge from directions distributed symmetrically around the axis of rotational symmetry. Flat-topped pyramids provide an additional beam along the axis thus generating three-dimensional structures. Experimental results are consistent with the results of numerical simulations. The advantages of the method are simplicity of operation, low cost, ease of integration, good stability, and high transmittance. Possible applications are the fabrication of photonic micro-structures such as photonic crystals or array waveguides as well as multi-beam optical tweezers.
Highlights
Photonic crystals (PhC) are refractive-index contrast structures with translational symmetry They exhibit so-called photonic bandgaps
A more convenient approach is to use lasers of good coherent characteristic that permit to create periodic patterns by multi-beams interference with a typical period in the order of the wavelength
A variety of two-dimensional (2D) and threedimensional (3D) periodic patterns can be obtained by changing the number, polarization state, or propagation directions of the beams [6]
Summary
Photonic crystals (PhC) are refractive-index contrast structures with translational symmetry They exhibit so-called photonic bandgaps. “Femtosecond laser interference technique with diffractive beam splitter for fabrication of three-dimensional photonic crystals,” Appl. “All fourteen Bravais lattices can be formed by interference of four noncoplanar beams,” Opt. Lett.
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