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Fig. 2 | PhotoniX

Fig. 2

From: Single-color peripheral photoinhibition lithography of nanophotonic structures

Fig. 2

7-diethylamino-3-thenoylcoumarin (DETC) as a SC-PPI photoinitiator. a Absorption (purple) and fluorescence (yellow) spectra of the photoinitiator DETC dissolved in the monomers. b Energy level scheme and transitions in a photoinitiator molecule under both excitation and inhibition illumination. Time sequences of a pulsed laser and a CW laser are shown for excitation and inhibition in SC-PPI lithography, where T is the femtosecond pulse repetition time. TPA, two-photon absorption; STED, stimulated emission depletion; ISC, intersystem crossing; TSA, triplet state absorption; R, radicals

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