Jeong Young-Gyun, Bernien Hannes, Kyoung Ji-Soo, Park Hyeong-Ryeol, Kim Hyun-Sun, Choi Jae-Wook, Kim Bong-Jun, Kim Hyun-Tak, Ahn Kwang Jun, Kim Dai-Sik
Department of Physics and Astronomy and Center for Subwavelength Optics, Seoul National University,Seoul, 151-747, Republic of Korea.
Opt Express. 2011 Oct 24;19(22):21211-5. doi: 10.1364/OE.19.021211.
We demonstrate an active metamaterial device that allows to electrically control terahertz transmission over more than one order of magnitude. Our device consists of a lithographically defined gold nano antenna array fabricated on a thin film of vanadium dioxide (VO(2)), a material that possesses an insulator to metal transition. The nano antennas let terahertz (THz) radiation funnel through when the VO(2) film is in the insulating state. By applying a dc-bias voltage through our device, the VO(2) becomes metallic. This electrically shorts the antennas and therefore switches off the transmission in two distinct regimes: reversible and irreversible switching.
我们展示了一种有源超材料器件，它能够在超过一个数量级的范围内对太赫兹传输进行电控制。我们的器件由光刻定义的金纳米天线阵列组成，该阵列制作在二氧化钒（VO₂）薄膜上，VO₂是一种具有从绝缘体到金属转变特性的材料。当VO₂薄膜处于绝缘状态时，纳米天线能让太赫兹（THz）辐射通过。通过给我们的器件施加直流偏置电压，VO₂会变成金属。这会使天线发生电短路，从而在两种不同状态下关闭传输：可逆切换和不可逆切换。
