Enhanced Terahertz Transmission Through Bullseye Plasmonics Lenses Fabricated Using Micromilling Techniques

Heggie, Tanner J.; Naylor, David; Gom, Brad; Bordatchev, Evgueni V.; Trimboli, M. Grace

doi:10.1007/s11468-015-0152-7

Cited by 2 publications

(1 citation statement)

References 33 publications

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“…When the structure is irradiated by a THz wave, the surface plasmon (SP) is excited and propagated to the transmission aperture, which is where the propagated SP is enhanced, allowing for sufficient light to be focused even when the transmission aperture is sub-wavelength. The strong light focusing characteristic and transmission enhancement of the BE structures can be utilized in various applications, such as imaging, sensing and enhancing the sensitivity of detectors [ 13 , 14 , 15 , 16 ]. A common challenge for these focusing devices that overcome the diffraction limit is that the structure-derived resonant frequency of the device, once fabricated, cannot be changed.…”

Section: Introductionmentioning

confidence: 99%

Frequency-Tunable Terahertz Plasmonic Structure Based on the Solid Immersed Method for Sensing

Sugaya

Kawano

2021

Sensors

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Terahertz waves are located in the frequency band between radio waves and light, and they are being considered for various applications as a light source. Generally, the use of light requires focusing; however, when a terahertz wave is irradiated onto a small detector or a small measurement sample, its wavelength, which is much longer than that of visible light, causes problems. The diffraction limit may make it impossible to focus the terahertz light down to the desired range by using common lenses. The Bull’s Eye structure, which is a plasmonic structure, is a promising tool for focusing the terahertz light beyond the diffraction limit and into the sub-wavelength region. By utilizing the surface plasmon propagation, the electric field intensity and transmission coefficient can be enhanced. In this study, we improved the electric field intensity and light focusing in a small region by adapting the solid immersion method (SIM) from our previous study, which had a frequency-tunable nonconcentric Bull’s Eye structure. Through electromagnetic field analysis, the electric field intensity was confirmed to be approximately 20 times higher than that of the case without the SIM, and the transmission measurements confirmed that the transmission through an aperture had a gap of 1/20 that of the wavelength. This fabricated device can be used in imaging and sensing applications because of the close contact between the transmission aperture and the measurement sample.

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Section: Introductionmentioning

confidence: 99%

Frequency-Tunable Terahertz Plasmonic Structure Based on the Solid Immersed Method for Sensing

Sugaya

Kawano

2021

Sensors

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Advanced optical nanolithography by enhanced transmission through bull’s eye nanostructured meta-mask

et al. 2023

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Plasmonic optical nanolithography using extraordinary optical transmission through a metallic nanohole mask has been actively applied to the high-resolution fabrication of nanostructures over a large area. Although there have been studies on improving the nanostructure fabrication performance in optical nanolithography, such as on adjustable external gap spacing, additional performance enhancement is required for practical applications and commercialization of large-area and high-resolution nanostructure array fabrication techniques. In this study, we design and apply a plasmonic bull’s eye nanostructured meta-mask to enhance the performance of optical nanolithography. Through simulation results and experimental verification, it is confirmed that advanced optical nanolithography using the bull’s eye nanostructured meta-mask has several merits compared to conventional Talbot lithography using nanoholes: (1) Optical nanolithography using the bull’s eye nanostructured meta-mask effectively fabricates nanopillar arrays even at a shorter exposure time than conventional optical lithography using nanoholes. (2) It is possible to create a large-area nanopillar array with various nanopillar diameters by exposure time control in optical nanolithography using the bull’s eye meta-mask. (3) Using water or objective immersion oil to increase the refractive index of the contact medium, light can be focused on smaller sizes, and large-area nanopillar arrays with smaller nanopillar diameters are established. With the upgradation of hardware for large-area fabrication, application of immersion media supplying techniques, and additional studies to establish complex nanostructures, optical nanolithography using the bull’s eye nanostructured meta-mask is an efficient modality to produce various nanostructure-based devices.

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Enhanced Terahertz Transmission Through Bullseye Plasmonics Lenses Fabricated Using Micromilling Techniques

Cited by 2 publications

References 33 publications

Frequency-Tunable Terahertz Plasmonic Structure Based on the Solid Immersed Method for Sensing

Frequency-Tunable Terahertz Plasmonic Structure Based on the Solid Immersed Method for Sensing

Advanced optical nanolithography by enhanced transmission through bull’s eye nanostructured meta-mask

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