As an illustration, Kang et al. experimentally demonstrated and confirmed with a combination of Brownian dynamics simulations and MPM calculations that the far-field infrared response of ITO nanocrystal gels can be continuously adjusted by simply changing the mixing ratio of small particles with low Sn content (Sn 4 -d 11 ) and large particles with high Sn content (Sn 8 -d 16 ) (Figure ). This modular mixing approach can achieve properties beyond those possible with a single type of plasmonic nanocrystal and offers wide-ranging opportunities for optical materials design.