Center for Nano-Optics;
Georgia State University;
Atlanta;
GA 30303;
USA;
Department of Physics and Astronomy;
Center for Nano-Optics;
Georgia State University;
Atlanta;
GA 30303;
USA;
Viterbi School of Engineering;
University of Southern California;
Los Angeles;
CA 90089;
USA;
black phosphorus; infrared spectroscopy; metallic surface layer; near-field nanoscopy; two-dimensional materials;