Electrical control of terahertz nano antennas on VO_2 thin film

Jeong, Yonghwan; Bernien, Hannes; Kyoung, Jisoo; Park, Hyeong Ryeol; Kim, Hyun Sun; Choi, Jae Wook; Kim, Bong Jun; Kim, Hyun‐Tak; Ahn, Kwang Jun; Kim, Dai Sik

doi:10.1364/oe.19.021211

Cited by 102 publications

(47 citation statements)

References 34 publications

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“…13 The luminous transmittance can be boosted by magnesium substitution [14][15] and by fluorination. 16 The metal-insulator transition can be influenced by a variety of external parameters, and recent work have considered the effects of strain [17][18][19] and lattice misfit with the substrate, 20,21 electric field or current activation, [22][23][24][25][26][27][28][29][30][31] light irradiation, [32][33][34][35][36][37][38] ion bombardment, 39,40 and gaseous ambience. 41 Considering the wealth of possibilities to modulate the properties of VO 2 -based thin films, it is not surprising that they are discussed for a vast number of applications such as thermochromic "smart" windows for energy efficient buildings, [42][43][44][45][46][47][48][49][50] variable-thermal-emittance surfaces for thermal radiation control, 51 oscillators and switches in (opto)electronics, 25,26,34,52,53 transistors of different types, <...>…”

Section: Introductionmentioning

confidence: 99%

Thermochromic VO2 nanorods made by sputter deposition: Growth conditions and optical modeling

Namura

Suzuki

et al. 2013

Journal of Applied Physics

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Thermochromic VO 2 nanorods made by sputter deposition: Growth conditions and optical modeling. Reactive dc magnetron sputtering onto glass-based substrates yielded deposits of thermochromic VO 2 with well-developed nanorods and nanowires. Their formation was promoted by high substrate temperature (above ~500 °C), sufficient film thickness, proper inlet of the reactive gas, dispersed gold "seeds" and pronounced substrate roughness. Rutherford back scattering ascertained mass thicknesses, scanning electron microscopy depicted the nanostructures, and glancing incidence Xray diffraction proved that single-phase VO 2 was normally formed. Journal of Applied PhysicsSpectrophotometric measurements of total and diffuse transmittance and reflectance on VO 2 thin films, at room temperature and ~100 °C, allowed us to determine complex dielectric functions below and above the "critical" temperature for thermochromic switching (~68 °C). These data were then used in computations based on the Bruggeman effective medium theory applied to randomly oriented prolate spheroidal structural units to derive the optical properties of the deposits.Experimental and computed data on spectral absorptance were found to be in good qualitative agreement.

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Section: Introductionmentioning

confidence: 99%

Thermochromic VO2 nanorods made by sputter deposition: Growth conditions and optical modeling

Namura

Suzuki

et al. 2013

Journal of Applied Physics

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“…VO 2 has received great attention for smart window application because of its ability to control solar heat gain [19]. Owing to its distinctive properties, VO 2 also offers potential for other technological uses, including IR bolometers [20,21], gas sensor [22,23], optical data storage and optical switching systems [24][25][26], flat panel display [27], electrode material in lithium batteries [28][29][30], and more recently in the terahertz range applications [31,32].…”

Section: Thermochromic Windowmentioning

confidence: 99%

Sol-gel approaches to thermochromic vanadium dioxide coating for smart glazing application

Seyfouri

Binions

2017

Solar Energy Materials and Solar Cells

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“…19,20 Vanadium dioxide (VO 2 ) is a promising material for active THz components 21 due to its ability to perform a reversible phase transition between an insulating to a conducting state, transition which can be realized by thermal, electrical, and optical means. Active VO 2 broadband switchable intensity modulators 22,23 and actively controlled VO 2 based gratings and polarizers 24,25 have been already demonstrated. These studies opened a new way of manipulating THz lights by VO 2 .…”

Section: Introductionmentioning

confidence: 99%

Invited Article: An active terahertz polarization converter employing vanadium dioxide and a metal wire grating in total internal reflection geometry

et al. 2018

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Active broadband terahertz (THz) polarization manipulation devices are challenging to realize, but also of great demand in broadband terahertz systems. Vanadium dioxide (VO2) shows a promising phase transition for active control of THz waves and provides broadband polarization characteristics when integrated within grating-type structures. We creatively combine a VO2-based grating structure with a total internal reflection (TIR) geometry providing a novel interaction mechanism between the electromagnetic waves and the device, to realize a powerful active broadband THz polarization-controlling device. The device is based on a Si-substrate coated with a VO2 layer and a metal grating structure on top, attached to a prism for generating the TIR condition on the Si-VO2-grating interface. The grating is connected to electrodes for electrically switching the VO2 between its insulating and conducting phases. By properly selecting the incident angle of the THz waves, the grating direction, and the incident polarization state, we first achieved a broadband intensity modulator under a fused silica prism with an average modulation depth of 99.75% in the 0.2-1.1 THz region. Additionally, we realized an active ultra-broadband quarter-wave converter under a Si prism that can be switched between a 45° linear rotator and a quarter wave converter in the 0.8-1.5 THz region. This is the first demonstration of an active quarter-wave converter with ultra-broad bandwidth performance. Our work shows a highly flexible and multifunctional polarization-controlling device for broadband THz applications.

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Electrical control of terahertz nano antennas on VO_2 thin film

Cited by 102 publications

References 34 publications

Thermochromic VO2 nanorods made by sputter deposition: Growth conditions and optical modeling

Thermochromic VO2 nanorods made by sputter deposition: Growth conditions and optical modeling

Sol-gel approaches to thermochromic vanadium dioxide coating for smart glazing application

Invited Article: An active terahertz polarization converter employing vanadium dioxide and a metal wire grating in total internal reflection geometry

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