(a) Schematic of MHM structures displaying dichroism between reflection and transmission modes. The MHM structures contain top Ag layer (H_top = 10 nm), PVA layer (H_PVA: 100–170 nm) and bottom Ag layer (H_bottom = 30 nm). (b) Height of PVA (the blue line), reflection and transmission resonances (the red dots and red circles respectively) of the corresponding MHM structures fabricated with varied EBL exposure dose. 2D contours of (c) reflection and (d) transmission spectra of MHM structures with the varied H_PVA of 100–170 nm. Corresponded 1931CIE diagrams with the varied H_PVA of 100–170 nm for (e) reflection and (f) transmission modes, respectively. Photographs of large-area MHM film showing different color for (g) reflection and (h) transmission modes visible to naked eye.