Abstract
In this work we propose to fabricate nano-scale square lattice features using the principle of four wavefront interference employing a pyramidal prism. A UV laser of 266nm wavelength was used to pattern features on thinned positive tone resist AZ 7220 using single exposure technique. It was demonstrated that features with sub 500nm pitch size could be recorded using a pyramidal prism with edge angle of 30.4°. Holes with diameter around 187nm in square symmetry with pitch of 414nm were fabricated. The proposed setup is relatively simple, requiring minimum number of components.
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