Molecular Photochemionics

Suitably designed molecular and supramolecular species are capable of combining light and chemical inputs to perform functions that mimic those of macroscopic devices. This paper describes the working principles of molecular‐level photochemionic devices for i) chemical switching of photonic input/output signals, ii) chemical tuning of photonic input/output signals, and iii) the transformation of chemical and/or optical signals for logic operation.