Narrowband terahertz emitters using metamaterial films

Alves, Fabio; Kearney, Brian; Grbovic, Dragoslav; Karunasiri, Gamani

doi:10.1364/oe.20.021025

Cited by 70 publications

(28 citation statements)

References 30 publications

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“…The thermal generation of narrowband THz with controlled emissivity has been demonstrated in Ref. 15. In this paper, we report on the fabrication, absorption, and emission characterization of Al/SU-8/Al THz metamaterial absorbers.…”

Section: Introductionmentioning

confidence: 88%

Metal-organic hybrid resonant terahertz absorbers with SU-8 photoresist dielectric layer

Grbovic

Alves

Kearney

et al. 2013

J. Micro/Nanolith. MEMS MOEMS

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Abstract. We report on the characterization of metal-organic hybrid metamaterials for MEMS-based terahertz (THz) thermal sensors and on the characterization of refractive index of SU-8 in the THz band. This type of metamaterial, coupled with the applicability of SU-8 as a structural material, offers possibilities for quick, simple microfabrication of THz imagers. SU-8, a negative photoresist, is a low-cost material that can quickly be spun onto a substrate at a wide range of thicknesses, and then photolithographically patterned into a variety of structures. It is also transparent to THz radiation and thus a suitable choice for a dielectric spacer in metamaterials. We investigated metamaterials consisting of a 0.18 μm Al ground plane and 0.18-μm layer of patterned Al separated by a dielectric spacer of ∼0.5 μm of SU-8. Absorption close to 70% at around 6.1 THz was observed. A model was developed to simulate absorption spectra of several metamaterials, agreeing well with experiments. Matching simulation to measurements was used to determine the refractive index of SU-8 at THz frequencies, extending the known values from 0.1 to 1.6 THz to as far as 10 THz. Finally, Kirchoff's law for these metamaterials was verified and their use as THz emitters demonstrated with about 0.8 mW∕cm 2 output.

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Section: Introductionmentioning

confidence: 88%

Metal-organic hybrid resonant terahertz absorbers with SU-8 photoresist dielectric layer

Grbovic

Alves

Kearney

et al. 2013

J. Micro/Nanolith. MEMS MOEMS

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“…Suggestions to increase the bandwidth of the absorber were also mentioned. Alves et al (2012) realized a narrowband (1 THz) emitter based on metamaterial structures at specific frequencies in the 4-8 THz region. The structure consisted of periodically repeated Al squares separated from an Al ground plane using silicon dioxide.…”

Section: Metamaterialsmentioning

confidence: 99%

Active Terahertz Metamaterial for Biomedical Applications

Choudhury

Menon

Jha

2015

Active Terahertz Metamaterial for Biomedical Applications

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Terahertz (THz) spectroscopy is gaining momentum as a tool for imaging in the field of biomedical engineering. This increase in popularity is due to the non-invasive, non-ionizing nature of terahertz radiation coupled with its propagation characteristics in water, which allows the operator to obtain high-contrast images of skin cancers, burns, etc. without detrimental effects. In order to tap this huge potential, researchers worldwide are aiming to build highly efficient biomedical imaging systems by introducing terahertz absorbers into biomedical detectors. The biggest challenge faced in the fulfilment of this objective is the lack of naturally occurring dielectrics, which is overcome with the use of artificially engineered resonant materials, viz. the metamaterials. This book describes such a metamaterial-based active absorber. The design has been optimized using particle swarm optimization (PSO), eventually resulting in an ultra-thin active terahertz absorber. The absorber shows near unity absorption for a tuning range of terahertz (THz) application.

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“…As a new branch of applications, recently, the metamaterial-based perfect absorbers have attracted considerable attentions in the worldwide range due to the potential applications including imaging, detecting, and sensing [5][6][7] since the first perfect metamaterial absorber was first experimentally demonstrated by Landy et al 8 . To date, they have been intensively investigated from microwave to optical frequencies [9][10] .…”

Section: Introductionmentioning

confidence: 99%

An ultra-broadband polarization-independent perfect absorber for the solar spectrum

Yan

et al. 2015

RSC Adv.

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aWe numerically investigated an ultra-broadband, polarization-insensitive, and wide-angle metamaterial absorber for harvesting solar energy using arrays of cascading three sets of subunit cell structures with obviously different lateral sizes, while each of subunit cell structures is composed of three pairs of metal-dielectric layers with the same lateral sizes but different dielectric constants. In this structure, the varying lateral dimensions provide multiple resonance main-bands in the composite structure, while the different dielectric constants of the dielectric layers induce multiple resonance subbands in the subunit cell. Simulation results show that the average absorption over the spectrum regime of 284-1524nm is more than 92%. Moreover, the ultra-broadband response above 92% absorption can be still maintained even when θ reaches 30 degrees. The ultra-broadband absorption obtained is attributed to the synthetic effect by the excitation of all resonances in the multiple resonant stacks of 3×3 cascading metal-dielectric pairs. Our absorber design has high practical feasibility and appears to be very promising for solar cell and photonic detection applications.

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Narrowband terahertz emitters using metamaterial films

Cited by 70 publications

References 30 publications

Metal-organic hybrid resonant terahertz absorbers with SU-8 photoresist dielectric layer

Metal-organic hybrid resonant terahertz absorbers with SU-8 photoresist dielectric layer

Active Terahertz Metamaterial for Biomedical Applications

An ultra-broadband polarization-independent perfect absorber for the solar spectrum

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