Temperature-driven switchable-beam Yagi-Uda antenna using VO2 semiconductor-metal phase transitions

Rahimi, Eesa; Şendur, Kürşat

doi:10.1016/j.optcom.2017.01.042

Cited by 9 publications

(4 citation statements)

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“…A high refractive index contrast in SOI-based structures makes it possible to reduce the overall footprint of the sensor to just a few microns [ 19 , 20 ] by actively confining optical modes. Similarly, there is an increasing use of phase change materials (PCMs) in the integrated optical devices [ 21 , 22 ]. In addition to their relevance with CMOS fabrication techniques, they are also capable of broadband operations [ 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Broadband-Tunable Vanadium Dioxide (VO2)-Based Linear Optical Cavity Sensor

Ayaz,

Balazadeh Koucheh,

Sendur

2024

Nanomaterials

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Sensors fabricated by using a silicon-on-insulator (SOI) platform provide promising solutions to issues such as size, power consumption, wavelength-specific nature of end reflectors and difficulty to detect ternary mixture. To address these limitations, we proposed and investigated a broadband-thermally tunable vanadium dioxide (VO2)-based linear optical cavity sensor model using a finite element method. The proposed structure consists of a silicon wire waveguide on a silicon-on-insulator (SOI) platform terminated with phase-change vanadium oxide (VO2) on each side to provide light confinement. A smooth transmission modulation range of 0.8 (VO2 in the insulator state) and 0.03 (VO2 in the conductive phase state) in the 125 to 230 THz spectral region was obtained due to the of Fabry–Pérot (FP) effect. For the 3.84 μm cavity length, the presented sensor resulted in a sensitivity of 20.2 THz/RIU or 179.56 nm/RIU, which is approximately two orders of magnitude higher than its counterparts in the literature. The sensitivity of the 2D model showed direct relation with the length of the optical cavity. Moreover, the change in the resonating mode line width Δν of approximately 6.94 THz/RIU or 59.96 nm/RIU was also observed when the sensor was subjected to the change of the imaginary part k of complex refractive index (RI). This property of the sensor equips it for the sensing of aternary mixture without using any chemical surface modification. The proposed sensor haspotential applications in the areas of chemical industries, environmental monitoring and biomedical sensing.

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Section: Introductionmentioning

confidence: 99%

Broadband-Tunable Vanadium Dioxide (VO2)-Based Linear Optical Cavity Sensor

Ayaz,

Balazadeh Koucheh,

Sendur

2024

Nanomaterials

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“…In one case, the beam of semi‐bowtie nano‐antenna is steered by changing the conductivity of a parasitic graphene sheet [30]. Changing the radiation pattern of Yagi‐Uda by tuning a thin layer of vanadium dioxide is another example of reconfigurable plasmonic nano‐antenna [31]. In another structure, variation of the Fermi level energies of the graphene layer leads to tuning the direction of the plasmonic nano‐antenna composed of Gold nano‐rods [32].…”

Section: Introductionmentioning

confidence: 99%

“…Indium tin oxide (ITO) [22], Ge 2 Sb 2 Te 5 [23], liquid crystal [24] and VO2 [25] are some active materials that could be used in polarisers [26], lenses [27], modulators [28], and also in beam-formers [29]. The other application of electro-optic materials is tuning the nano-antennas electrically with static structures [30][31][32]. In one case, the beam of semibowtie nano-antenna is steered by changing the conductivity of a parasitic graphene sheet [30].…”

Section: Introductionmentioning

confidence: 99%

Rotational freedom thin‐film solar cell using a reconfigurable nano‐antenna with 4‐Dimethyl‐Amino‐N‐methyl‐4‐Stilbazolium Tosylate

Shameli

Safian

2022

IET Optoelectronics

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In this paper, we proposed a new method to realize the rotational freedom of thin‐film solar cells. In this method, an array of reconfigurable nano‐patches fed by a plasmonic waveguide is integrated inside the solar cell to receive and trap light in the active layer. The reconfigurable nano‐antenna is designed to achieve beam steering by bias voltage in the direction of sunlight during the day using 4‐Dimethyl‐Amino‐N‐methyl‐4‐Stilbazolium Tosylate as an active electro‐optic material integrated into the plasmonic waveguide. The proposed solar cell is investigated using the finite‐difference frequency‐domain method and the drift‐diffusion equations of COMSOL Multiphysics software at different wavelengths of light and a wide range of angles of incidence for transverse magnetic (TM) and transverse electric (TE) polarizations. The numerical results show increase in the absorption in large wavelengths of sunlight for the thin‐film solar cell with nano‐antenna, resulting in a short circuit current enhancement of 1.48 and 1.45 for TE and TM polarisations, respectively. Also, another advantage of the proposed reconfigurable structure is maintaining the performance in different angles of incidence, which may open up a new opportunity in solar energy harvesting.

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“…[38] Recently, thin VO 2 films have also been used to actively tune the beam steering angle of slot arrays [39] and switch the propagation direction of surface plasmon polariton (SPP) on metallic slabs. [40] Though a Yagi-Uda antenna for switchable radiation with VO 2 has been proposed, [41] the structure needs a rather complicated fabrication process. To the best of our knowledge, a simpler and readily fabricated structure with VO 2 for switchable directional scattering has not been reported yet.…”

Section: Introductionmentioning

confidence: 99%

Subwavelength asymmetric Au–VO ₂ nanodisk dimer for switchable directional scattering

et al. 2018

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We propose an asymmetric Au-VO 2 nanodisk dimer for realizing a switchable directional scattering. Specifically, the directional scattering can be triggered on/off through controlling the phase transition of the VO 2 nanodisk from metallic to semiconductor state. More strikingly, an obvious directional scattering with the directivity of ∼ 40 dB is achieved under the metallic state of VO 2 nanodisk. This tunable directional scattering is further explained with an interference model where the Au and VO 2 nanodisks are treated as two weakly interacting electric dipoles. The phase transition controlled scattering patterns of asymmetric Au-VO 2 nanodisk dimer are then well interpreted from the phase difference between these two dipoles.

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Temperature-driven switchable-beam Yagi-Uda antenna using VO2 semiconductor-metal phase transitions

Cited by 9 publications

References 50 publications

Broadband-Tunable Vanadium Dioxide (VO2)-Based Linear Optical Cavity Sensor

Broadband-Tunable Vanadium Dioxide (VO2)-Based Linear Optical Cavity Sensor

Rotational freedom thin‐film solar cell using a reconfigurable nano‐antenna with 4‐Dimethyl‐Amino‐N‐methyl‐4‐Stilbazolium Tosylate

Subwavelength asymmetric Au–VO ₂ nanodisk dimer for switchable directional scattering

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Temperature-driven switchable-beam Yagi-Uda antenna using VO2 semiconductor-metal phase transitions

Cited by 9 publications

References 50 publications

Broadband-Tunable Vanadium Dioxide (VO2)-Based Linear Optical Cavity Sensor

Broadband-Tunable Vanadium Dioxide (VO2)-Based Linear Optical Cavity Sensor

Rotational freedom thin‐film solar cell using a reconfigurable nano‐antenna with 4‐Dimethyl‐Amino‐N‐methyl‐4‐Stilbazolium Tosylate

Subwavelength asymmetric Au–VO 2 nanodisk dimer for switchable directional scattering

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Subwavelength asymmetric Au–VO ₂ nanodisk dimer for switchable directional scattering