  Plasmonic metamaterials support the localized surface plasmon resonance
(LSPR), which is sensitive to the change in the dielectric environment and
highly desirable for ultrasensitive biochemical sensing. In this work, a novel
design of supercell metamaterials of four mutually rotating split ring
resonators (SRRs) is proposed, where simultaneous excitations of odd (N=1 and N
= 3) and even (N=2) resonance modes are realized due to additional asymmetry
from the rotation and show insensitivity to two orthogonal polarizations. The
full utilization of these three resonance dips show bright prospects for
multispectral application. As a refractive index (RI) sensor, ultrahigh
sensitivities ~1000nm/RIU for LC mode (N=1) and ~500nm/RIU for plasmon mode
(N=2) are obtained in near infrared (NIR) spectrum.
