Fig. 4. 2D Au square arrays fabricated by holographic DLIP. Arrays of 25 nm thick (a) squares (640 nm × 640 nm) and (b) parallelograms (2.4 μm × 1.8 μm). Arrays of 40 nm thick (c) elongated squares (2.98 μm × 3.04 μm) and (d) parallelograms (5.8 μm × 950 nm). Scale bar = 10 μm.