Curved-lattice epitaxial growth of InxAl1-xN nanospirals with tailored chirality

Abstract

Chirality, tailored by external morphology and internal composition, has been realized by controlled curved-lattice epitaxial growth of InxAl1-xN nanospirals. The curved morphology of the spiral segments is a result of a lateral compositional gradient while maintaining a preferred crystallographic growth direction, implying a lateral gradient in optical properties. Individual nanospirals show an asymmetric core-shell structure with curved basal planes. Mueller matrix spectroscopic ellipsometry shows that the tailored chirality is manifested in the polarization state of light reflected off the nanospirals.