Circular dichroism (CD), different absorption of RCP and LCP waves, can be strongly enhanced in chiral metamaterials. CD spectrum is very meaningful feature in both biology and chemistry to probe the conformational state. In this paper, planar chiral metamaterials (PCM) comprising of a tri-layer metal/phase-change material (VO2) /metal sandwich and conjugated gammadions are both studied theoretically by using finite-difference time-domain (FDTD) method. And a wide tuning range of CD is obtained by changing temperature of VO2. Particle swarm optimization (PSO) algorithm is used to optimize the geometric parameters of PCM structures. A large value of circular dichroism in excess of 40% is presented in dielectric PCM, but CD drop down to 16% in the metallic PCM at λ=1.18μm. We also analyze the distribution of current modes, electric and magnetic fields at the resonant frequency to account for the above results.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.