Hyperbolic phonon polaritons in suspended hexagonal boron nitride

Dai, S. ; Quan, J. ; Hu, G. ; Qiu, C. - W. ; Tao, T. H. ; Li, X. ; Alù, A. Hyperbolic phonon polaritons in suspended hexagonal boron nitride. Nano letters. Copy at http://www.tinyurl.com/29svwl8n