TERAHERTZ TIME-DOMAIN DIFFERENTIATOR

摘要

A device (100) and method for differentiating an incident electromagnetic pulse (200). A conductive grating (100) is provided with a sub-wavelength period, an area larger than the electromagnetic beam diameter, and a grating conductor thickness greater than the skin depth of the electromagnetic pulse in the conductor. The grating conductors (110) are oriented essentially parallel to the incident electromagnetic pulse to diffract the electromagnetic pulse. An aperture captures only the zero order diffraction of the electromagnetic pulse, which is the first time-derivative of the incident electromagnetic pulse.