A Vanadium Dioxide Metamaterial Disengaged from Insulator-toMetal Transition

作者：Jeong Young Gyun; Han Sanghoon; Rhie Jiyeah; Kyoung Ji Soo; Choi Jae Wook; Park Namkyoo; Hong Seunghun; Kim Bong Jun; Kim Hyun Tak; Kim Dai Sik^*

来源：Nano Letters, 2015, 15(10): 6318-6323.

DOI：10.1021/acs.nanolett.5b02361

• Vanadium dioxide
• insulator to metal transition
• Boltzmann tail
• nanogap
• nano antenna
• terahertz spectroscopy
• transition device
• lithography

We report that vanadium dioxide films patterned with lambda/100000 nanogaps exhibit an anomalous transition behavior at millimeter wavelengths. Most of the hybrid structure's switching actions occur well below the insulator to metal transition temperature, starting from 25 degrees C, so that the hysteresis curves completely separate themselves from their bare film counterparts. It is found that thermally excited intrinsic carriers are responsible for this behavior by introducing enough loss in the context of the radically modified electromagnetic environment in the vicinity of the nanogaps. This phenomenon newly extends the versatility of insulator to metal transition devices to encompass their semiconductor properties.

• 出版日期2015-10