REDUCING SCATTERING RELATED FEATURES IN TERHERTZ TIME DOMAIN SPECTROSCOPY BY AVERAGING THE IMPULSE WAVEFORM OVER A PLURALITY OF SAMPLE POINTS

摘要

A method of investigating an object, comprising the steps of: (a) irradiating the object with an optically-generated pulse of electromagnetic radiation, said pulse having a plurality of frequencies in the range from 100 GHz to 100 THz; (b) detecting radiation transmitted and/or reflected from a first point on or within the object to obtain a time domain waveform; wherein the irradiating pulse of radiation is focussed at a second point on or within the object.