Metal-mesh optical filter technology for mid-IR, far-IR, and submillimeter

McGovern, William R.; Swinehart, Philip R.; Hogue, Eric L.; Daughton, David R.; DeLombard, Jay V.

doi:10.1117/12.918674

Cited by 1 publication

(1 citation statement)

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“…Among many passive devices, terahertz-wave bandpass filters (BPFs) with multi-frequency operations will be crucial to enhance efficiency in applications such as astronomy, terahertz signal processing, imaging, communications, and biomedical and chemical sensors [4,5]. Additionally, the exciting possibilities of artificially designed metamaterials with a subwavelength scale, customizable electromagnetic (EM) properties, and the ability to control them at the unit cell level, make them promising candidates for the development of versatile terahertz components [6,7].…”

Section: Introductionmentioning

confidence: 99%

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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