Transmission features of frequency-selective components in the far infrared determined by terahertz time-domain spectroscopy

Winnewisser, C.; Lewen, Frank; Weinzierl, J.; Helm, H.

doi:10.1364/ao.38.003961

Cited by 58 publications

(24 citation statements)

References 24 publications

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“…Waveguide array plate (WAP) filters [14] can be designed to have high transmission ( > 50%) at the resonance wavelength, a very sharp transition to the long wavelength cutoff [15] and some suppression of the shorter wavelengths. Fine wire mesh filters, on the other hand, cannot provide the efficient rejection of background while, at the same time, allowing the desired wavelengths to pass through.…”

Section: The Optical Systemmentioning

confidence: 99%

Longitudinal electron bunch profile diagnostics at 45 MeV using coherent Smith-Purcell radiation

Doucas

Blackmore

Ottewell

et al. 2006

Phys. Rev. ST Accel. Beams

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We have used coherent Smith-Purcell radiation in order to investigate the longitudinal (temporal) profile of the electron bunch at the FELIX facility. Detection of the far-infrared radiation was achieved by a simple and compact experimental arrangement, consisting of an array of 11 room-temperature pyroelectric detectors. Accurate determination of the background radiation, use of high quality optical filters, and an efficient light collection system are essential for this type of experiment. The radiated power is in good agreement with the predictions of the surface current description of this process. It is concluded that 90% of the bunch particles are contained within 5.5 ps, with a temporal profile that could be approximately triangular in shape.

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Section: The Optical Systemmentioning

confidence: 99%

Longitudinal electron bunch profile diagnostics at 45 MeV using coherent Smith-Purcell radiation

Doucas

Blackmore

Ottewell

et al. 2006

Phys. Rev. ST Accel. Beams

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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].…”

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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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“…Theoretically [22], the phase of may be stabilized at around −180 • in higher frequency (> 441 GHz). But according to Figure 4, the phase varies irregularly, mainly due to the existence of the grating lobe, and the method of eliminating grating lobe is explicitly stated in the following part.…”

Section: Results and Optimizationmentioning

confidence: 96%

Quasi-Optical Frequency Selective Surface for Atmospheric Remote Sensing Application

Xia¹,

Zhang²,

Huang

et al. 2013

PIER M

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Abstract-The design of an efficient quasi-optics Frequency Selective Surface (FSS) filter which is required to provide a −3 dB pass band from 405 GHz to 441 GHz is presented. For atmospheric remote sensing application, this space-borne spatial device consists of a silicon layer and a thin copper layer which is perforated with periodic arrays of resonant dipole slots and circular apertures. FSS unit cell has a dimension much smaller than its operating wavelength. Unique features of this complex dense FSS structure include wide pass band properties with superb performance of frequency response and incident angles independence for TE polarization. Floquet mode analysis and finite element method (FEM) models are used to establish the geometry of the periodic structure and predict its spectral response.

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Transmission features of frequency-selective components in the far infrared determined by terahertz time-domain spectroscopy

Cited by 58 publications

References 24 publications

Longitudinal electron bunch profile diagnostics at 45 MeV using coherent Smith-Purcell radiation

Longitudinal electron bunch profile diagnostics at 45 MeV using coherent Smith-Purcell radiation

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

Quasi-Optical Frequency Selective Surface for Atmospheric Remote Sensing Application

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