Uniform suspended nanorods fabricated by bidirectional scanning via two-photon photopolymerization

Suspended nanorods fabricated by two-photon photopolymerization gradually thickened in the scanning direction when the scanning speed was faster than 60 µm s(-1). For a 2 µm long suspended nanorod, the lateral widths of the thin and the thick ends were about 50 and 150 nm. A bidirectional scanning technique was proposed to effectively eliminate the size difference, resulting in uniform suspended nanorods of 100 nm in width and 2 µm in length.