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We suggest that all-photodesigned metamaterials, sub-wavelength custompatterns of photo-excited carriers on a semiconductor, can display an exoticextrinsic electromagnetic chirality in terahertz (THz) frequency range. Weconsider a photo-induced pattern exhibiting 1D geometrical chirality, i.e. itsmirror image can not be superposed onto itself by translations withoutrotations and, in the long wavelength limit, we evaluate its bianisotropicresponse. The photo-induced extrinsic chirality turns out to be fullyreconfigurable by recasting the optical illumination which supports thephoto-excited carriers. The all-photodesigning technique represents a feasible,easy and powerful method for achieving effective matter functionalization and,combined with the chiral asymmetry, it could be the platform for a newgeneration of reconfigurable devices for THz wave polarization manipulation.

Extrinsic electromagnetic chirality in all-photodesigned one-dimensional THz metamaterials