Passive THz imaging in nanoscale

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We have developed an ultra-sensitive scanning near-field THz microscope with a method of forming a near-field probe and with a home-made scanning probe microscope. With the developed microscope, we have achieved passive near-field images with 60 nm spatial resolution. By studying a GaAs/Au sample at room temperature without an external light, we obtained evanescent field near the surface. Through many experimental examinations, the signal origin was turned out to be thermal charge/current fluctuation, which had not been experimentally probed.