A flexible wideband bandpass terahertz filter using multi-layer metamaterials

Liu, Liang; Jin, Biaobing; Wu, Jingbo; Huang, Yi; Ye, Zhihui; Huang, Xiaoming; Zhou, Dong; Wang, Guosheng; Jia, Xiaoqing; Lu, Hai; Kang, Lin; Xu, Wei; Chen, Jian; Wu, Peiheng

doi:10.1007/s00340-013-5470-x

Cited by 41 publications

(25 citation statements)

References 23 publications

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“…Results measured using a THz time-domain spectroscopy system show excellent agreement with those from the simulations. Compared with the broadband filters reported before [18][19][20][21][22], the complementary ring structure in our design is insensitive to any polarization at normal incidence due to symmetry of the ring. Furthermore, the influence of structure parameters (such as period, radius, slot width, thickness and incidence angles) on the transmission has been investigated.…”

Section: Introductionmentioning

confidence: 90%

“…Chiang et al [19] presented an ultrabroad terahertz bandpass filter based on a metal-dielectric-metal sandwiched structure, which possessed a notable spectral-filtering capability with a 0.5 THz bandwidth. Liang et al [20] made a wideband bandpass filter using multi-layer structure (dielectric-metaldielectric-metals-dielectric). The center frequency of the filter is about 0.89 THz with a 3 dB bandwidth of 0.69 THz for normal incidence.…”

Section: Introductionmentioning

confidence: 99%

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Broadband and Polarization Independent Terahertz Metamaterial Filters Using Metal-Dielectric-Metal Complementary Ring Structure

2016

Journal of the Optical Society of Korea

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Broadband metal-dielectric-metal terahertz filters composed of complementary rings are designed and demonstrated. Four samples with different parameters were fabricated. Results measured using THz time-domain spectroscopy system show excellent agreement with simulations. Compared with the broadband filters reported before, the complementary ring structure in our design is insensitive to any polarization at normal incidence due to symmetry of the ring. Furthermore, the influence of structure parameters (such as period, radius, slot width, thickness and incidence angles) on the transmission characteristics has been investigated theoretically. The encouraging results afforded by designing of the filters could find applications in broadband sensors, terahertz communication systems, and other emerging terahertz technologies.

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Broadband and Polarization Independent Terahertz Metamaterial Filters Using Metal-Dielectric-Metal Complementary Ring Structure

2016

Journal of the Optical Society of Korea

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“…The thickness of each metallic layer is assumed to be 200 nm. Here, one of the complementary metallic layers has been reduced in contrast to [8][9][10][11] (the complementary metallic layer has been placed at the center of the crossed pairs), which leads to a broader bandwidth and flatter passband, according to the following discussion.…”

Section: A Broadband Filtermentioning

confidence: 99%

“…Although various types of multilayer/composite structures have been reported for the realization of broadband terahertz BPFs, achievements in broadening the bandwidth and flat passband are not notable, except for the work of [8][9][10][11]. This constraint is the first challenge addressed in the current research.…”

Section: Introductionmentioning

confidence: 97%

GaN-based metamaterial terahertz bandpass filter design: tunability and ultra-broad passband attainment

2015

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Engineering metamaterial-based devices such as terahertz bandpass filters (BPFs) play a definitive role in advancement of terahertz technology. In this article, we propose a design procedure to obtain a considerably broadband terahertz BPF at a normal incidence; it shows promising filtering characteristics, including a wide passband of ∼1.34 THz at a central frequency of 1.17 THz, a flat top in a broad band, and high transmission, compared to previous reports. Then, exploiting the voltage-dependent carrier density control in an AlGaN/GaN heterostructure with a Schottky gate configuration, we investigate the tuning of the transmission properties in a narrow-band terahertz filter. A combination of the ultra-wide, flat-top BPF in series with the tunable, narrow band filter designed in the current study offers the ability to tune the desired resonance frequency along with high out-of-band rejection and the suppression of unwanted resonances in a large spectral range. The proposed structure exhibits a frequency tunability of 103 GHz for a voltage change between -8 and 2 V, and a transmission amplitude change of ∼0.51. This scheme may open up a route for the improved design of terahertz filters and modulators.

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“…Instead, isotropic patterns like metal patch [29,30], cross patterns [31,32] and closed rings [32,33] were chosen as unit cell structures. These designs often have multi-layers stacked close together and hence place stringent requirement on layer thickness [29] and alignment accuracy of each layer [30,32]. Moreover, the stacking of lossy dielectric layers may also give rise to high transmission loss.…”

Section: Introductionmentioning

confidence: 99%

A Design of Terahertz Broadband Filters and its Effect in Eliminating Asymmetric Characteristics in Device Structures

Zhu

Lee

2015

J. Lightwave Technol.

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Abstract-We report a straightforward way to design and fabricate polarization-insensitive broadband bandstop filters in terahertz range by fabricating identical metal patterns on both sides of a dielectric substrate with one layer rotated 90 o to the other. The unit cells used in such designs are the well-studied split-ring-resonators, hence the frequency range of the stop band can be easily tuned by varying the dimensions of the unit cell structures. Through simulation analysis, we show that such fabrication method requires no alignment in lithography step and works with common dielectric substrates. Two types of substrates, 1 mm-thick quartz and 100 μm-thick polyethylene terephthalate, were used as a demonstration. The transmission level stayed below 12% for a stopband of 0.42 THz frequency range. Lastly, we reasoned with simulation results that the proposed broadband filters give consistent performance regardless of the gap location in the unit cell, which will further extend their use in practical applications.

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A flexible wideband bandpass terahertz filter using multi-layer metamaterials

Cited by 41 publications

References 23 publications

Broadband and Polarization Independent Terahertz Metamaterial Filters Using Metal-Dielectric-Metal Complementary Ring Structure

Broadband and Polarization Independent Terahertz Metamaterial Filters Using Metal-Dielectric-Metal Complementary Ring Structure

GaN-based metamaterial terahertz bandpass filter design: tunability and ultra-broad passband attainment

A Design of Terahertz Broadband Filters and its Effect in Eliminating Asymmetric Characteristics in Device Structures

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