Hybrid metamaterials enable fast electrical modulation of freely propagating terahertz waves

• Published in: Applied physics letters Vol. 93; no. 9; pp. 091117 - 091117-3
• Main Authors: Chen, Hou-Tong, Palit, Sabarni, Tyler, Talmage, Bingham, Christopher M., Zide, Joshua M. O., O'Hara, John F., Smith, David R., Gossard, Arthur C., Averitt, Richard D., Padilla, Willie J., Jokerst, Nan M., Taylor, Antoinette J.
• Format: Journal Article
• Language: English
• Published: American Institute of Physics 01-09-2008
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/1.2978071

We demonstrate fast electrical modulation of freely propagating terahertz waves at room temperature using hybrid metamaterial devices. The devices are planar metamaterials fabricated on doped semiconductor epitaxial layers, which form hybrid metamaterial-Schottky diode structures. With an applied ac voltage bias, we show modulation of terahertz radiation at inferred frequencies over
2
MHz
. The modulation speed is limited by the device depletion capacitance which may be reduced for even faster operation.