Room-temperature nanoimprint lithography

Pisignano, D. Persano, L. Visconti, P. Cingo-lani, R. Gigli, G. Barbarella, G. Favaretto, L. Oligomer-based organic distributed feedback lasers by room-temperature nanoimprint lithography. Appl. Phys. Lett. 2003, 83 (13), 2545-2547. 

The optical properties ofthe nanofibers can also be tailored by including a periodic, wavelength-scale microstructure in the fibers. This can be achieved through specifically developed lithographic techniques such as room-temperature nanoimprint lithography (RT-NIL). ... 

In the table absorption wavelengths (nm) and PL quantum yields (%) of compounds 4 and 6-10 before and after room-temperature nanoimprint lithography (RT-NIL). (a) AFM two-dimensional view of a 400 nm periodic grating transferred into the non-thermoplastic oligothiohene-S,S-dioxide 9, and correponding cross-section (b). The height of the features is about 30 nm. 

With the same material, compound 9, a directly printed distributed feedback (DFB) laser [75, 76] was obtained by room-temperature nanoimprint lithography [55-57]. The laser exhibited a single-mode emission peaked at 637 nm, with a full width at half-maximum of less than 0.7 nm and a pump threshold of 140 ttJcm 2. -pjjg lithography process allowed the pattern to be transferred with high precision... 

By combining electron-beam and soft lithography, including room-temperature nanoimprinting, one-dimensional planar photonic crystal (ID PhC) structures were realized with oligothiophene-5,5-dioxide 9 [77, 80], ID PhCs offer much more effective control of the device spectmm than external cavities and for this reason they are considered to be useful for the realization of electrically driven organic semiconductor lasers. 

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