Calculated and measured transmittance of a tunable metallic photonic crystal filter for terahertz frequencies

Drysdale, Timothy D.; Blaikie, Richard J.; Cumming, David R. S.

doi:10.1063/1.1636822

Cited by 50 publications

(18 citation statements)

References 13 publications

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“…shift is reached at s = 140 µm, the centre frequency does not rise again as strongly as reported previously for a lower frequency device 8 . We believe that this is due to the measured gap between the plates of 30 µm in both experiments having a greater effect at the shorter wavelengths studied in this work.…”

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confidence: 63%

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Transmittance of a tunable filter at terahertz frequencies

Drysdale

Gregory

Baker

et al. 2004

Applied Physics Letters

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A metallic photonic crystal filter has been demonstrated at terahertz frequencies, with the passband tuneable over the range 365 -386 GHz. Tuning is achieved by a relative lateral shift of two metallic photonic crystal plates. Each plate comprises two orthogonal layers of gratings and integral mounting lugs. The plates are micromachined from silicon wafers then coated in gold to provide metallic electromagnetic behaviour. An insertion loss of 3 -7 dB and Q in the range 20 -30 was achieved. A shift of 140 µm gave a tuning range of 21 GHz, tuning sensitivity of 150 GHz/mm and a fractional tuning range of 6%.

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confidence: 63%

“…The filter is designed for free-space operation and is constructed from two identical plates, as shown in Fig. 1 (not to scale, and with a cut-away for clarity) 8,9 . Each plate comprises two orthogonal linear grids with integral mounting lugs.…”

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confidence: 99%

Transmittance of a tunable filter at terahertz frequencies

Drysdale

Gregory

Baker

et al. 2004

Applied Physics Letters

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“…Photonic crystals (PCs) are periodic structures that allow one to manipulate the flow of light [2]. Most of the publications on THz PC are based on structures comprising semiconductors [6][7][8][9][10], polymers [11] or metals [12]. Tuning of photonic band structures in these PCs is realized by mechanical deformation or filling with different media.…”

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confidence: 99%

Strontium titanate/silicon-based terahertz photonic crystal multilayer stack

et al. 2011

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A one-dimensional photonic crystal working in the terahertz (THz) range was designed and implemented. To facilitate the design, the transmission properties of strontium titanate crystals were characterized by THz-time-domain spectroscopy. Relatively high refractive index (∼18.5) and transmission ratio (0.08) were observed between 0.2 to 1 THz. A stacked structure of (Si d Si /STO d STO ) N /Si d Si was then designed, with transmission spectra calculated by the transfer matrix method. The effects of the filling ratio (d STO /(d Si + d STO )), periodicity (d Si + d STO ) and the number of repeats N on the transmission of PC were investigated. The effect of introducing a defect layer was also studied. Based on these, Si/STO multilayers with STO defect thickness of 125 µm and 200 µm were measured. The shift of the defect mode was observed and compared with the calculations.

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“…Once components are fabricated or structures are fixed, the filtering characteristics of these SPP filters will be unchangeable. To overcome these disadvantages, a mechanical tunable THz filter 16,17 and a thermal tunable THz filter 18 have been reported, which are known as active components.…”

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Highly tunable Terahertz filter with magneto-optical Bragg grating formed in semiconductor-insulator-semiconductor waveguides

Zhang

et al. 2013

AIP Advances

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A highly tunable terahertz (THz) filter with magneto-optical Bragg grating formed in semiconductor-insulator-semiconductor waveguides is proposed and demonstrated numerically by means of the Finite Element Method. The results reveal that a sharp peak with high Q-value presents in the band gap of Bragg grating waveguide with a defect, and the position of the sharp peak can be modified greatly by changing the intensity of the transverse magnetic field applied to the device. Compared to the situation without magnetic field applied, the shift of the filtered frequency (wavelength) reaches up to 36.1 GHz (11.4 μm) when 1 T magnetic field is applied. In addition, a simple model to predict the filtered frequency and an effective way to improve the Q-value of the filter are proposed by this paper

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Calculated and measured transmittance of a tunable metallic photonic crystal filter for terahertz frequencies

Cited by 50 publications

References 13 publications

Transmittance of a tunable filter at terahertz frequencies

Transmittance of a tunable filter at terahertz frequencies

Strontium titanate/silicon-based terahertz photonic crystal multilayer stack

Highly tunable Terahertz filter with magneto-optical Bragg grating formed in semiconductor-insulator-semiconductor waveguides

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