Figure 6.

Transmission characteristics when light is incident from the front and back of the device and from the front and back of the device at a 90° tilt. The transmission characteristics of the front and back surfaces at the same angle were almost identical. The circular dichroism measurement error is confirmed by the linearity of the birefringence. (a) PDMS thin film with Au nanospiral structures on a glass cell. (b) Glass cell holder and tilt angle of the glass cell. (c) Setup of the circular dichroism measurement. (d) Circular dichroism spectrum of the device which has left-handed Au nanospiral structures for front side and back side illumination with θ = 0° or 90°.