Ultrafast optical control of terahertz surface plasmons in subwavelength hole arrays at room temperature

作者：Azad Abul K^*; Chen Hou Tong; Kasarla Satish R; Taylor Antoinette J; Tian Zhen; Lu Xinchao; Zhang Weili; Lu Hong; Gossard Arthur C; O'; Hara John F

来源：Applied Physics Letters, 2009, 95(1): 011105.

DOI：10.1063/1.3168510

We demonstrate optical control of surface plasmon enhanced resonant terahertz transmission in two-dimensional subwavelength metallic hole arrays fabricated on gallium arsenide based substrates. Optically pumping the arrays creates a conductive layer in the substrate, reducing the terahertz transmission amplitude of both the resonant mode and the direct transmission. Under low optical fluence, the terahertz transmission is more greatly affected by resonance damping than by propagation loss in the substrate. An ErAs:GaAs nanoisland superlattice substrate is shown to allow ultrafast control with a switching recovery time of similar to 10 ps.

• 出版日期2009-7-6