Mapping an on-chip terahertz antenna by a scanning near-field probe and a fixed field-effect transistor<xref ref-type="fn" rid="cpb140887fn1">*</xref>

Mapping an on-chip terahertz antenna by a scanning near-field probe and a fixed field-effect transistor*

Lü Li^a),^b), Sun Jian-Dong^a)†, Lewis Roger A.^c), Sun Yun-Fei^d), Wu Dong-Min^a),^d), Cai Yong^a), Qin Hua^a)‡

Maps of the tip-induced photocurrent by raster scanning the tip at different tip-detector distances: (a) z _p = 1 μm, (b) z _p = 5 μm, (c) z _p = 15 μm, and (d) z _p = 25 μm.