Patent ID: 8582079
Filing Date: 2013-11-12
Classification: G02B,G03F

Abstract:
1. An interference lithography system comprising: a nonlinear photoresist, wherein the nonlinear photoresist does not integrate energies of consecutive exposures; a light source, wherein the light source produces a beam of substantially coherent light; an optical splitter within the path of the beam of coherent light, wherein the optical splitter splits the beam of coherent light into a plurality of beams of substantially coherent light; a plurality of mirrors, wherein each mirror reflects a beam of light from the plurality of beams of light towards the nonlinear photoresist; a phase difference sensor that detects the phase difference between the plurality of beams of substantially coherent light; and a Pockels cell disposed within the optical path of at least one of the plurality of beams of substantially coherent light, wherein the Pockels cell is in communication with the phase difference sensor such that the phase difference sensor communicates a phase error to the Pockels cell, wherein the interference lithography system is adapted to expose the nonlinear photoresist with a first exposure with a first phase difference between the plurality of beams of light, the interference lithography system is adapted to expose the nonlinear photoresist with a second exposure with a second phase difference between the plurality of beams of light, the first phase difference and the second phase difference are not equal, and the difference between the first phase difference and the second phase difference is between about 70° and 270°, and wherein a half pitch of the exposures is below the Rayleigh limit.