title: Single-shot two-photon exposure of commercial photoresist for the production of three-dimensional structures.
abstract: We report the use of an amplified femtosecond laser for single-shot two-photon exposure of the commercial photoresist SU-8. By scanning of the focal volume through the interior of the resist, three-dimensional (3-D) structures are fabricated on a shot-by-shot basis. The 800-nm two-photon exposure and damage thresholds are 3.2 and 8.1TW/cm(2), respectively. The nonlinear nature of the two-photon process allows the production of features that are smaller than the diffraction limit. Preliminary results suggest that Ti:sapphire oscillators can achieve single-shot two-photon exposure with thresholds as low as 1.6TW/cm(2) at 700 nm, allowing 3-D structures to be constructed at megahertz repetition rates.
authors: G
authors: G
authors: Witzgall
authors: R
authors: R
authors: Vrijen
authors: E
authors: E
authors: Yablonovitch
authors: V
authors: V
authors: Doan
authors: B J
authors: BJ
authors: Schwartz