Spectral transmittance of lossy printed resonant-grid terahertz bandpass filters

MacDonald, Michael E.; Alexanian, A.; York, R.A.; Popović, Zoya; Grossman, Erich N.

doi:10.1109/22.841963

Cited by 78 publications

(46 citation statements)

References 11 publications

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“…were previously highlighted by other authors for composite materials operating in the Terahertz range [16][17][18][19], in agreement with the static surface resistance variation…”

Section: Discussionsupporting

confidence: 89%

“…Even if the trend of the attenuation clearly depends on metal thickness (see Figure 6), the introduction of this surface resistance values in the MoM code produces a smaller attenuation with respect to the measured one. In the referred work [16][17][18][19], the authors found the same attenuation behaviour but they computed higher static surface resistance values because of a thinner substrates. According to [5,20], the blueshift is qualitatively associated to a dipole-dipole interaction, which is increasing important in our samples as the thickness allows the circulation of currents in the transverse direction.…”

Section: Discussionmentioning

confidence: 69%

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Effect of the Metal Sheet Thickness on the Frequency Blueshift in Single Layer Composite Materials at Ka Microwave Frequency

Amabile¹,

Prati

Costa³

et al. 2011

PIER Letters

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Abstract-The frequency shift of the transfer function of single layer composite materials has been analyzed and tested. The effects are studied by means of planar pseudo-elliptical filters in Ka waveguide. The filters, consisting of a frequency selective surface placed perpendicularly to the waveguide axis, have been realized by a high resolution photolithographic technique. Deviations of the experimental transfer functions from the simulation are analyzed with particular emphasis to the effect of metal thickness. The finite thickness of the metal constituting the frequency selective surface causes a shift of the transfer function towards high frequencies (blueshift), attributed to dipole-dipole interaction in the metal layer. Such an effect is only partially predicted by full wave analysis based on finite element method. The increase of the thickness determines a reduction of the attenuation for thickness values between 10 and 100 skin depths.

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“…were previously highlighted by other authors for composite materials operating in the Terahertz range [16][17][18][19], in agreement with the static surface resistance variation…”

Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 69%

Effect of the Metal Sheet Thickness on the Frequency Blueshift in Single Layer Composite Materials at Ka Microwave Frequency

Amabile¹,

Prati

Costa³

et al. 2011

PIER Letters

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“…Different FSS configurations have been proposed for this kind of application: free-standing perforated metal foils [4], perforated grids supported by a membrane [5], symmetric hybrid radomes (perforated grids sandwiched between two identical dielectric layers) [6], Ch. 7, and multilayer free-standing slot arrays [7], [8].…”

Section: Introductionmentioning

confidence: 99%

Design and testing of frequency selective surfaces on thick silicon substrate operating at 600 GHz

Biber

Bozzi²,

Gunther³

et al. 2005

2005 European Microwave Conference

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This paper describes the design and experimental verification of frequency selective surfaces, to be used as quasioptical filters in the sub-millimeter wave range. They consist of a thin metal layer perforated periodically with rectangular or dogbone-shaped holes, and supported by a thick silicon substrate.A set of filters with pass-band at 600 GHz and stop-band at 750 GHz have been designed and tested. The design procedure based on the MoM/BI-RME method, the manufacturing of prototypes by standard processes available from the semiconductor industries, and their measurement by CW and THz time-domain spectroscopy are reported in this work.This class of filters is mechanically robust, presents low losses (1.4 dB), exhibits good reproducibility, and permits a fine tuning of the stop-band frequency by slightly changing the incidence angle.

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“…A simple theoretical model is presented and shows good agreement with the experimental data. Although the microwave and terahertz transmission through thin-metal films or metal foils perforated periodically with apertures has been studied since 1967 [1][2][3][4][5][6], unusual high-transmission resonances through subwavelength hole arrays were only recently discovered [7,8] at optical frequencies. These resonances occurred at wavelengths different from those predicted by the classic diffraction theory [2].…”

mentioning

confidence: 99%

Observation of a New Type of THz Resonance of Surface Plasmons Propagating on Metal-Film Hole Arrays

Grischkowsky

2004

Phys. Rev. Lett.

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Highly conducting metal-film subwavelength hole arrays, lithographically fabricated on highresistivity silicon wafers in optical contact with thick silicon plates, have been characterized by terahertz time-domain spectroscopy with subpicosecond resolution and over a frequency range from 0.5 to 3 THz with 5 GHz resolution. Awell-defined ringing structure extending to more than 250 psec is observed on the trailing edge of the transmitted THz pulse. In the frequency domain this ringing structure corresponds to a new type of extremely sharp resonant line structure between the fundamental surface plasmon modes of the hole array. A simple theoretical model is presented and shows good agreement with the experimental data. DOI: 10.1103/PhysRevLett.93.196804 PACS numbers: 73.20.Mf, 41.20.Jb, 42.25.Fx, 78.47.+p Although the microwave and terahertz transmission through thin-metal films or metal foils perforated periodically with apertures has been studied since 1967 [1][2][3][4][5][6], unusual high-transmission resonances through subwavelength hole arrays were only recently discovered [7,8] at optical frequencies. These resonances occurred at wavelengths different from those predicted by the classic diffraction theory [2]. Since this discovery much work has been done to experimentally characterize the transmission of thin subwavelength hole arrays in the optical [9-21], infrared [22], and THz [23][24][25][26][27][28] regions. The enhanced transmission is now understood to be due to the excitation of surface plasmon (SP) resonances [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]24,25,[27][28][29][30][31][32][33]. The SP enhancement can be affected by the refractive index of the adjacent medium [9,12], the shape and orientation of the holes [10,20,27], and the thickness of the metal film [16]. In all these measurements, SP enhanced transmission has been observed only at the frequencies determined by the integral order SP modes coupled to the array [7,8]. Here, we present observations of a new type of high-transmission, extremely narrow resonances at frequencies between those of the integral order SP modes. These resonances correspond to SP propagation in directions different than those allowed by the integral order modes. We call these resonances fractional order surface plasmons (FSP), which are made possible by the high conductivity of metal films at THz frequencies.In this Letter, we present a time-domain and frequency-domain study of the amplitude and phase transmission properties of a thin-metal-film subwavelength hole array, lithographically fabricated on a silicon wafer. The utilized THz time-domain spectroscopy (THz-TDS) technique measures the complete THz electric field pulse with subpicosecond time resolution [34]. For this characterization a subpicosecond THz pulse is incident on the hole array. The transmitted THz pulse consisted of an attenuated subpicosecond pulse due to the classical electromagnetic transmission of the array, followed by a dramatic ringing structure, extending to approximatel...

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Spectral transmittance of lossy printed resonant-grid terahertz bandpass filters

Cited by 78 publications

References 11 publications

Effect of the Metal Sheet Thickness on the Frequency Blueshift in Single Layer Composite Materials at Ka Microwave Frequency

Effect of the Metal Sheet Thickness on the Frequency Blueshift in Single Layer Composite Materials at Ka Microwave Frequency

Design and testing of frequency selective surfaces on thick silicon substrate operating at 600 GHz

Observation of a New Type of THz Resonance of Surface Plasmons Propagating on Metal-Film Hole Arrays

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