Abstract
Large-scale surface relief diffraction gratings with pitches up to 20 μm were fabricated in thin films of azobenzene molecular glass using a single-step and mask-less photolithography process. A modified Lloyd's mirror interferometer having two degrees of freedom generated an interference pattern that was incident on the azobenzene films. Some of the fabricated gratings had non-periodic profiles resulting from the superposition of multiple sine waves, while others had periodic blazed sawtooth and Dirac comb profiles. Furthermore, careful selection of the experimental parameters resulted in gratings with a beat interference profile having a clearly-visible modulation envelope. A theoretical framework was developed to successfully explain the obtained grating profiles.
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