The past few years have witnessed an explosive development of chiral photonic metamaterials that exhibit circular dichroism and optical rotation orders of magnitude larger than conventional materials. Though chirality is most commonly applied in linear optical regime, opposing circularly polarized waves can also display parity as a property of higher order optics. In this talk, we present a set of photonic metamaterials that possess pronounced chiroptical features in the nonlinear regime. In additional to the gigantic chiral properties such as the circular dichroism and polarization rotation, the metamaterials demonstrate a distinct contrast between harmonic responses from the two circular polarizations. These nano-engineered structures are further exploited for chiral-selective two-photon luminescence from quantum emitters and a photon-drag effect with helicity-sensitive generation of photocurrent. Finally, we report a noticeable shift in the circular dichroism and optical activity under a modest level of excitation power.
 Y. Cui, … W. Cai, “Giant chiral optical response from a twisted-arc metamaterial,” Nano Lett. 14, 1021 (2014).
 S. P. Rodrigues, … W. Cai, “Nonlinear imaging and spectroscopy of chiral metamaterials,” Adv. Mater. 26, 6157 (2014).
 S. P. Rodrigues, … W. Cai, “Metamaterials enable chiral-selective enhancement of two-photon luminescence from quantum emitters,” Adv. Mater. 27, 1130 (2015).
 L. Kang, … W. Cai, “An active metamaterial platform for chiral responsive optoelectronics,” Adv. Mater., 27, 4377 (2015).
 S. P. Rodrigues, … W. Cai, “Intensity-dependent modulation of optically active signals in a chiral metamaterial,” Nat. Comm., in press (2017).
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