Fig. 3. Vertical and lateral antenna structure coupled to the quantum tunnel junction. Vertical MIM. (a) Rectangular slot of optical antenna with single-crystalline hexagonal boron nitride (h-BN) multilayer [
61], ©2015, Nature Publishing Group. (b) h-BN and graphene stacked with nanocube antenna. Image reproduced with permission [
62] under the terms of the Creative Commons Attribution 4.0 International license. (c) Template dielectrophoretic trapped nanoparticle optical antenna. Reprinted with permission [
58]. ©2019, American Chemical Society. Lateral MIM. (d) Light emission by Yagi-Uda antenna, Image reproduced with permission [
67] under the terms of the Creative Commons Attribution 4.0 International license. (e) Directional and unidirectional emission of light by V-shape antenna, Reprinted with permission [
69]. ©2017, American Chemical Society. (f) Atomically smoothened tunnel junction between highly crystalline nanocubes [
73]. ©2018, Nature Publishing Group.
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