Abstract：
:In this paper, large area and deep sub-wavelength interference patterns are realized experimentally by using odd surface plasmon modes in the metal/insulator/metal structure. Theoretical investigation shows that the odd modes possesses much higher transversal wave vector and great inhibition of tangential electric field components, facilitating surface plasmon interference fringes with high resolution and contrast in the measure of electric field intensity. Interference resist patterns with 45 nm (∼λ/8) half-pitch, 50 nm depth, and area size up to 20 mm × 20 mm were obtained by using 20 nm Al/50 nm photo resist/50 nm Al films with greatly reduced surface roughness and 180 nm pitch exciting grating fabricated with conventional laser interference lithography. Much deeper resolution down to 19.5 nm is also feasible by decreasing the thickness of PR. Considering that no requirement of expensive EBL or FIB tools are employed, it provides a cost-effective way for large area and nano-scale fabrication.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Liu L,Luo Y,Zhao Z,Zhang W,Gao G,Zeng B,Wang C,Luo Xdoi
10.1038/srep30450subject
Has Abstractpub_date
2016-07-28 00:00:00pages
30450issn
2045-2322pii
srep30450journal_volume
6pub_type
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