Holographic metalens for switchable focusing of surface plasmons.
Surface plasmons polaritons (SPPs) are light-like waves confined to the interface between a metal and a dielectric. Excitation and control of these modes requires components such as couplers and lenses. We present the design of a new lens based on holographic principles. The key feature is the ability to switchably control SPP focusing by changing either the incident wavelength or polarization. Using phase-sensitive near-field imaging of the surface plasmon wavefronts, we have observed their switchable focusing and steering as the wavelength or polarization is changed.
†School of Engineering and Applied Sciences, Harvard University, 9 Oxford Street, McKay 125, Cambridge, Massachusetts 02138 United States.
Daniel
D
Wintz
†School of Engineering and Applied Sciences, Harvard University, 9 Oxford Street, McKay 125, Cambridge, Massachusetts 02138 United States.|‡Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, Singapore 638075, Singapore.
Patrice
P
Genevet
†School of Engineering and Applied Sciences, Harvard University, 9 Oxford Street, McKay 125, Cambridge, Massachusetts 02138 United States.|§CNR-SPIN U.O.S. Napoli, Dipartimento di Fisica, Università di Napoli Federico II, Complesso Universitario di Monte Sant'Angelo, Via Cintia, 80126 - Napoli, Italy.
Antonio
A
Ambrosio
†School of Engineering and Applied Sciences, Harvard University, 9 Oxford Street, McKay 125, Cambridge, Massachusetts 02138 United States.
Alex
A
Woolf
†School of Engineering and Applied Sciences, Harvard University, 9 Oxford Street, McKay 125, Cambridge, Massachusetts 02138 United States.
Federico
F
Capasso
Metasurfaces; holography; metalens; surface plasmons