5 years ago

Transparent Electrochemical Gratings from a Patterned Bistable Silver Mirror

Transparent Electrochemical Gratings from a Patterned Bistable Silver Mirror
Jongbeom Na, Eunkyoung Kim, Chihyun Park, Minsu Han
Silver mirror patterns were formed reversibly on a polystyrene (PS)-patterned electrode to produce gratings through the electrochemical reduction of silver ions. The electrochemical gratings exhibited high transparency (T > 95%), similar to a see-through window, by matching the refractive index of the grating pattern with the surrounding medium. The gratings switch to a diffractive state upon the formation of a mirror pattern (T < 5%) with a high diffraction efficiency up to 40%, providing reversible diffractive gratings. The diffraction state was maintained in the voltage-off state (V-off) for 40 min, which demonstrated bistable reversible electrochemical grating (BREG) behavior. By carefully combining the BREGs through period matching, dual-color switching was achieved within the full color region, which exhibited three distinct optical switching states between −2.5, 0, and +2.5 V. The wide range of light tenability using the metallic BREGs developed herein enabled IR modulation, NIR light reflection, and on-demand heat transfer.

Publisher URL: http://dx.doi.org/10.1021/acsnano.7b02294

DOI: 10.1021/acsnano.7b02294

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