Terahertz metasurface ultra-thin collimator for power enhancement

Suzuki, Takao; Endo, Kota; Kondoh, Satoshi

doi:10.1364/oe.392814

Cited by 15 publications

(3 citation statements)

References 25 publications

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“…Unlike natural materials or traditional three-dimensional meta-materials, metasurfaces are artificially engineered electromagnetic materials. They consist of either periodic or aperiodic arrays of twodimensional sub-wavelength structures, notable for their ultralight and ultra-thin characteristics [25,26].…”

Section: Introductionmentioning

confidence: 99%

Phase and Amplitude Simultaneously Coding Metasurface with Multi-frequency and Multifunctional Electromagnetic Modulations

Cai,

Li,

et al. 2024

Preprint

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The integration of multiple functionalities into a single, planar, ultra-compact metasurface has presented significant opportunities for enhancing capacity and performance within compact 5G/6G communication systems. Recent advances in multifunctional metasurfaces have unveiled comprehensive wavefront manipulations utilizing phase, polarization transmission/reflection, and coding apertures. Despite these developments, there remains a critical need for multifunctional metasurfaces with expanded channel capabilities, including multiple operational frequencies, minimal crosstalk, and high-efficiency computable array factors. This study introduces a multifunctional metasurface that integrates phase- and amplitude simultaneous coding meta-atoms at dual frequencies. By altering the polarization of electromagnetic (EM) waves, it is possible to reshape the wave-fronts of reflected waves at these frequencies. The coding metasurface proficiently manipulates both x and y linearly polarized waves through phase and amplitude coding at dual frequencies, thereby enabling distinct functionalities such as anomalous reflection, reflection imaging, and vortex wave beam generation. Both theoretical analysis and full-wave simulation confirm the anticipated functionalities of the designed devices, paving the way for advancements in integrated communication systems with diverse functionalities.

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Section: Introductionmentioning

confidence: 99%

Phase and Amplitude Simultaneously Coding Metasurface with Multi-frequency and Multifunctional Electromagnetic Modulations

Cai,

Li,

et al. 2024

Preprint

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“…In 2020, our work predicted the possibility of a metalens incorporating the reflectionless metasurface with a high refractive index by simulations. 38) However, it has yet to be shown by measurements whether our original metalens integrated with an actual terahertz CW source at a short distance, in the order of one wavelength, could enhance the directivity of terahertz waves. The simulated metalens in Ref.…”

mentioning

confidence: 98%

“…The simulated metalens in Ref. 38 In this letter, we integrate a fabricated collimating metalens made with our original metasurface with an RTD at a distance of 1.0 mm (1.0 λ). Measurements verify that the collimating metalens integrated with the RTD enhances the directivity to 3.0 times that of a single RTD.…”

mentioning

confidence: 99%

Resonant tunneling diode integrated with metalens for high-directivity terahertz waves

Endo

Sekiya

Sato

et al. 2021

Appl. Phys. Express

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Terahertz flat optics based on our originally developed low-reflection metasurface with a high refractive index can offer attractive two-dimensional optical components for the manipulation of terahertz waves. However, it remains to be shown whether a planar collimating metalens made with our original metasurface could be mounted on a resonant tunneling diode with a short distance. Here, we demonstrate that a collimating metalens with a distance of 1.0 mm from the RTD enhances the directivity to 3.0 times at 0.312 THz. The proposed metalens would be integrated with various terahertz continuous-wave sources for emerging industry such as 6 G (beyond 5 G) communications.

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Terahertz Metasurfaces for Thermally Controlled Optical Encryption

Zhu

Dong

Guo

et al. 2023

Laser & Photonics Reviews

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Terahertz (THz) metasurfaces have emerged as powerful tools to modulate the wavefronts of THz radiation fully. Smart designs and fabrication are essential for enhancing the flexibility and encryption security of THz metasurfaces. In addition to digital coding metasurfaces and microelectromechanical systems, one method to realize dynamic THz metasurfaces is to utilize an active material. In this paper, a dynamic THz metasurface, which is combined with the phase‐change material VO2 and can be thermally controlled to achieve optical encryption, is proposed. Based on the electromagnetically induced transparency effect and by arranging the antennas in advance according to a specific hologram, a secret image can be encoded into the metasurface. At room temperature, the transmitted light field is an irregular light spot with no useful information. If the temperature increases above the phase‐change temperature, the encrypted hologram can be reconstructed. Moreover, owing to the distinct characteristics of VO2, the phase‐change temperature required during decryption is not very high, and the entire process is reversible. It is expected that, in combination with updated processing technology, such metasurfaces can be practically applied to the next generation of optical encryption or optical anticounterfeiting in the future.

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Terahertz metasurface ultra-thin collimator for power enhancement

Cited by 15 publications

References 25 publications

Phase and Amplitude Simultaneously Coding Metasurface with Multi-frequency and Multifunctional Electromagnetic Modulations

Phase and Amplitude Simultaneously Coding Metasurface with Multi-frequency and Multifunctional Electromagnetic Modulations

Resonant tunneling diode integrated with metalens for high-directivity terahertz waves

Terahertz Metasurfaces for Thermally Controlled Optical Encryption

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