Journal of NanophotonicsEmbedding multiple nondiffracting defect sites in periodic lattice wavefield by optical phase engineering
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A periodic lattice wavefield with multiple nondiffracting negative defect sites at the desired locations is very useful in photonic crystal device fabrication and other applications. Such a nondiffracting wavefield was realized by coherently superposing periodic lattice wavefields with Bessel wavefields at each of the defect sites. The experimental verification was done by making use of a phase only spatial light modulator (SLM) in a basic 4f Fourier filtering geometry where the image to be displayed on the SLM was calculated by making use of phase engineering. Photonic crystals with very small periods are possible to be fabricated as the method is wavelength independent and completely scalable.