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Electrical control of terahertz nano antennas on VO2 thin film.
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 Optical Society of America 2011 Optics express Vol.19 No.22
<P>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.</P>
Active Terahertz Nanoantennas Based on VO<sub>2</sub> Phase Transition
Seo, Minah,Kyoung, Jisoo,Park, Hyeongryeol,Koo, Sukmo,Kim, Hyun-sun,Bernien, Hannes,Kim, Bong Jun,Choe, Jong Ho,Ahn, Yeong Hwan,Kim, Hyun-Tak,Park, Namkyoo,Park, Q-Han,Ahn, Kwangjun,Kim, Dai-sik American Chemical Society 2010 Nano letters Vol.10 No.6
<P>Unusual performances of metamaterials such as negative index of refraction, memory effect, and cloaking originate from the resonance features of the <I>metallic composite atom</I><SUP>1−6</SUP>. Indeed, control of metamaterial properties by changing dielectric environments of thin films below the metallic resonators has been demonstrated<SUP>7−11</SUP>. However, the dynamic control ranges are still limited to less than a factor of 10,<SUP>7−11</SUP> with the applicable bandwidth defined by the sharp resonance features. Here, we present ultra-broad-band metamaterial thin film with colossal dynamic control range, fulfilling present day research demands. Hybridized with thin VO<SUB>2</SUB> (vanadium dioxide)(12-18) films, nanoresonator supercell arrays designed for one decade of spectral width in terahertz frequency region show an unprecedented extinction ratio of over 10000 when the underlying thin film experiences a phase transition. Our nanoresonator approach realizes the full potential of the thin film technology for long wavelength applications.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2010/nalefd.2010.10.issue-6/nl1002153/production/images/medium/nl-2010-002153_0002.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl1002153'>ACS Electronic Supporting Info</A></P>