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Chirality of Ladder-shaped Nanostructures on Polystyrene Microspheres

We fabricated regular ladder-shaped nanostructures on polystyrene microspheres by oblique angle deposition (OAD) technique. The results show that the nanostructures exhibit chirality and their circular dichroism (CD) signals can be enhanced by adjusting the gradients of the structures or the angles between the steps. Such structures have potential applications in optical devices.