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Chirality is probably the most mysterious among all symmetry transformations.Very readily broken in biological systems, it is practically absent innaturally occurring inorganic materials and is very challenging to createartificially. Chiral optical wavefronts are often used for the identification,control and discrimination of left- and right-handed biological and othermolecules. Thus, it is crucially important to create materials capable ofchiral interaction with light, which would allow one to assign arbitrary chiralproperties to a light field. In this paper, we utilized van der Waalstechnology to assemble helical homostructures with chiral properties (e. g.circular dichroism). Because of the large range of van der Waals materialsavailable such helical homostructures can be assigned with very flexibleoptical properties. We demonstrate our approach by creating helicalhomostructures based on multilayer As$_2$S$_3$, which offers the mostpronounced chiral properties even in thin structures due to its strong biaxialoptically anisotropy. Our work showcases that the chirality of anelectromagnetic system may emerge at an intermediate level between themolecular and the mesoscopic one due to the tailored arrangement of non-chirallayers of van der Waals crystals and without additional patterning.

Chiral photonic super-crystals based on helical van der Waals homostructures