Material distribution

Terahertz Collimator in the 3.0 THz-band

Reference
[1] Takehito Suzuki, Kota Endo, and Satoshi Kondoh, "Terahertz metasurface ultra-thin collimator for power enhancement," Optics Express, vol.28, no.15, pp.22165-22178, July 2020.

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Reflectionless zero refractive index metasurface in the terahertz waveband

Material properties
Metamaterial
Thickness: 51 um
Frequency: 0.5-THz band
Refractive index: 0.16+j0.09(0.505 THz)
Transmitted Power: 97.3%(0.505 THz)
Reflected Power: 0.7%(0.505 THz)
Relative permittivity: 0.18-j0.10(0.505 THz)*(The onservation of energy is satisfied as explained in Sec. 4.)
Relative permeability: 0.004+j0.16(0.505 THz)

Reference
[1] Takehito Suzuki and Harumi Asada, "Reflectionless zero refractive index metasurface in the terahertz waveband," Optics Express, vol.28, no.15, pp.21509-21521, July 2020.

Material with high refractive index and low reflection in the 3.0-THz band

Material properties
Metamaterial
Thickness: 5 um
Frequency: 3.0-THz band
Refractive index (Designed value in [1]): 8.0+j0.4(2.92 THz)
Transmitted Power (Designed value in [1]): 71.2%(2.92 THz)
Reflected Power (Designed value in [1]): 1.2%(2.92 THz)
Design parameters are mainly offered for this material with a high refractive index and low reflectionin the 3.0-THz band. The measurements could be included by experimental errors and fabrication errors in [1] and [2].

References
[1] Harumi Asada, Kota Endo, and Takehito Suzuki, "Reflectionless metasurface with high refractive index in the terahertz waveband," Optics Express, vol.29, vol.10, pp.14513-14524, Apr. 2021.
[2] H. Asada and T. Suzuki, The 66th JSAP Spring Meeting, 11p-S421-17, Mar. 2019.
[3] H. Asada, Proceedings of graduation thesis, Feb. 2019.

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Material with negative rfractive index in the 2.0-THz band

Material properties
Metamaterial
Thickness: 51 um
Frequency: 2.0-THz band
Refractive index: -3.03+j0.29(1.96 THz)
Transmitted Power: 56.4%(1.96 THz)
Reflected Power: 3.51%(1.96 THz)
Design parameters are mainly offered for this material with a negative refractive index in the 2.0-THz band. The measurements could be included by experimental errors and fabrication errors.

Reference
[1] Takehito Suzuki and Satoshi Kondoh, "Negative Refractive Index Metasurface in the 2.0-THz Band," Optical Materials Express, vol. 8, no.7, pp.1916-1925, 2018.

Material with negative refractive index and high transmission, and low loss

Material Properties
Metamaterial
Thickness: 51 um
Frequency: 0.42 THz
Refractive index: -4.2+j0.17(0.42THz)
Transmitted Power: 81.5%(0.42THz)
Reflected Power: 4.3%(0.42THz)
FOM(nreal/nimag): 24.2(0.42 THz)

Reference
[1] Takehito Suzuki, Masashi Sekiya, Tatsuya Sato, and Yuki Takebayashi, "Negative Refractive Index Metamaterial with High Transmission, Low Reflection, and Low Loss in the Terahertz Waveband," Optics Express, vol. 26, no.7, pp.8314-8324, Apr. 2018.

Terahertz collimator lens in the 0,3 THz-band with a short focal length

Performance
Metalens/Antenna
Frequency: 0.3 THz band
Focal length: 1 mm
Diameter: 2 mm
F/D: 0.5
NA: 0.7

References
[1] Kota Endo, Masashi Sekiya, Jaeyoung Kim, Kento Sato, and Takehito Suzuki, "Resonant tunneling diode integrated with metalens for high-directivity terahertz waves," Appled Physics Express, vol.14, no.8, pp.082001, July 2021.

Press release
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Terahertz collimator lens in the 0,3 THz-band

Performance
Metalens/Antenna
Frequency: 0.3 THz band
Focal length: 10 mm
Diameter:
F/D:
NA:

References
Takehito Suzuki, Kota Endo, Jaeyoung Kim, Kazuisao Tsuruda, and Masashi Sekiya, "Metalens mounted on a resonant tunneling diode for collimated and directed terahertz waves," Optics Express, Vol. 28, no. 15, pp. 22165-22178, 2021.

[1] R. Ohuchi, K. Ishihara, T. Sato, T. Togashi, and T. Suzuki, “Design of a gradient collimated lens on a thin film with high refractive indices and low reflection,” IEICE Trans. Commun. vol.J100-B, no.3, pp.235-244, Mar. 2017.

[2] Takehito Suzuki, "Exploration and terahertz applications of materials with unprecedented refractive indices," OYO BUTURI, vol.86, no.10, pp.897-902, Oct. 2017.

Terahertz focusing lens in the 0,3 THz-band

References
[1] T. Suzuki, R. Ohuchi, K. Ishihara, T. Togashi, and N. Koja, “Proposal and design of a ultrathin gradient lens consisting of metamaterials with high refractive indices and extremely low reflection in the 0.3-THz Band,” Rev. Laser Eng. 44, 116-120 (2016).

Material with high refractive index and extremely low reflection in the 0.3-THz band

Material properties
Metamaterial
Thickness: 51 um
Frequency: 0.3-THz band
Refractive index: 6.66+j0.123(0.309THz)
Reflected Power: 1.16%(0.309THz)
Transmitted Power: 91.8%(0.309THz)
FOM(nreal/nimag): 54.3(0.309 THz), 314(0.291 THz)

References
[1] Koki Ishihara and Takehito Suzuki, "Metamaterial Demonstrate Both a High Refractive Index and Extremely Low Reflection in the 0.3-THz band," Journal of Infrared, Millimeter, and Terahertz Waves, vol. 38, no. 9, pp. 1130-1139, Sep. 2017. (Invited Paper)

[2] Takehito Suzuki, "Exploration and terahertz applications of materials with unprecedented refractive indices," OYO BUTURI, vol.86, no.10, pp.897-902, Oct. 2017.

Terahertz large-aperture quarter-wave plate

References
[1] Takehito Suzuki, Ryuji Ohuchi, Nozomu Koja, Koki Ishihara, "Design and Measurement of a Terahertz Large-Aperture Quarter-Wave Plate with Double-layer Metal Cut Wires on a Flexible and Thin Film," IEEJ Transactions on Sensors and Micromachines, vol.135, no.11, pp.478-479, Nov. 2015.

Terahertz polarizer GoIS®

Suzuki Laboratory in Ibaraki University plans to provide a sample of teraherz polarizer GoIS® with extremely high extinction ratios in association with JST (Japan Science and Technology Agency) for the benefit of academic progress and industrial growth.

Please contact our E-mail if you want to request a sample of GoIS®.

References
[1] Takehito Suzuki, Masaya Nagai, and Yudai Kishi, "Extreme-Sensitivity Terahertz Polarizer Inspired by an Anisotropic Cut-through Metamaterial," Optics Letters, vol.41, no.2, pp.325-328, Jan. 2016.

[2] Yudai Kishi, Masaya Nagai, John C. Young, Keisuke Takano, Masanori Hangyo, and Takehito Suzuki, "Terahertz laminated-structure polarizer with high extinction ratio and transmission power," Applied Physics Express, vol. 8, no. 3, pp. 032201-1-4, Feb. 2015.