16 February 2010 Two-color photo-initiation/inhibition lithography
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Traditional photolithography begins with single-photon absorption of patterned light by a photo-initiator to locally expose a resist. In two-color photo-initiation/inhibition (2PII) lithography, these exposed regions are confined by a surrounding pattern of inhibitors generated by one-photon absorption of a second color in a photo-inhibitor. Like a stencil used to confine spray-paint to a thin, sharp line, the inhibitory pattern acts as a remotely programmable, transient near-field mask to control the size and shape of the modified resist region. The inhibiting species rapidly recombine in the dark, allowing for fast sequential exposures and thus enabling fabrication of complex two- or threedimensional structures.
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Robert R. McLeod, Robert R. McLeod, Benjamin A. Kowalski, Benjamin A. Kowalski, Michael C. Cole, Michael C. Cole, } "Two-color photo-initiation/inhibition lithography", Proc. SPIE 7591, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics III, 759102 (16 February 2010); doi: 10.1117/12.845850; https://doi.org/10.1117/12.845850

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