BROADBAND TERAHERTZ GENERATION OF METAMATERIALS

摘要

Provided are systems and methods to generate single-cycle THz pulses from a few tens of nanometers thin layer of split ring resonators (SRRs) via optical rectification of femtosecond laser pulses. The emitted THz radiation, with a spectrum ranging from about 0.1 to 4 THz, arises exclusively from pumping the magnetic-dipole resonance of SRRs around 200 THz. This resonant enhancement, together with pump polarization dependence and power scaling of the THz emission, underpins the nonlinearity from optically induced circulating currents in SRRs, with a huge effective nonlinear susceptibility of 0.8×10−16 m2/V that far exceeds surface nonlinearities of both thin films and bulk organic/inorganic crystals and sheet nonlinearities of non-centrosymmetric materials such as ZnTe.

主权项

1. A terahertz (THz) emitter comprising:
an array of split-ring resonators (SSRs) configured to produce emissions of EMR in the THz spectrum between about 0.1 THz and about 10 THz upon energization by pulses of EMR having a wavelength of between about 1.1 μm to about 2.6 μm.