Broad-band microwave measurements with transient radiation from optoelectronically pulsed antennas

Terahertz (THz) radiation occupies part of the electromagnetic spectrum between the infrared and microwave bands. Until recently, technology at THz frequencies was underdeveloped compared to the rest of the electromagnetic spectrum, leaving a gap between millimeter waves and the far-infrared (FIR). In the past decade, interest in the THz gap has been increased by the development of ultrafast laser-based T-ray systems and their demonstration of diffraction-limited spatial resolution, picosecond temporal resolution, DC-THz spectral bandwidth and signal-to-noise ratios above 10 4 . This chapter reviews the development, the state of the art and the applications of T-ray spectrometers. Continuous-wave (CW) THz-frequency sources and detectors are briefly introduced in comparison to ultrafast pulsed THz systems. An emphasis is placed on experimental applications of T-rays to sensing and imaging, with a view to the continuing advance of technologies and applications in the THz band.

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“…For the case where the sample thickness d s is greater than the reference thickness d r , 341 n s (u) = 4>(")-…”

Section: S R N 2 {Hi + H S )(H S + N 3 )mentioning

confidence: 99%

T-Ray Sensing and Imaging

Mickan

Zhang

2003

Int. J. Hi. Spe. Ele. Syst.

110

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“…This technique is capable of free-space microwave measurements over a broad frequency range (15-135 GHz) with good (60 : 1) polarization sensitivity [7,8] . In addition, the phase sensitivity of COMITS allows direct determination of the dispersion relation for EM-wave propagation in photonic crystals [3] .…”

Section: Investigation Of Absolute Photonicmentioning

confidence: 99%

“…Signal averaging is performed by adding 1000 scans with a rapidscan delay line. A more detailed description of the COMITS technique is given in [8] .…”

Section: Investigation Of Absolute Photonicmentioning

confidence: 99%

“…The relative phase delay 4(f) with and without the sample where c is the velocity of light . The phase sensitivity of COMITS was characterized by measuring fused silica of known refractive index and found to be accurate to within ±2% [8] . The in-plane wave-vector k for EM-wave propagation is then calculated with k=(2itf/c)n(f) .…”

Section: Investigation Of Absolute Photonicmentioning

confidence: 99%

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Investigation of Absolute Photonic Band Gaps in Two-dimensional Dielectric Structures

Lin

Arjavalingam

Robertson

1994

Journal of Modern Optics

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“…Recent experiments have shown that commuting devices of optoelectronic pulses associated with appropriate antennas can be used to generate, control and detect picosecond bursts of electromagnetic radiation. It leads to various applications (1) such as the transient radiation properties of antennas (2), the scattering of radiation by three-dimensional objects (3) or the characterization of material by the coherent microwave transient spectroscopy technique (4).…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic analysis of exponentially tapered coplanar stripline antennas used in coherent microwave transient spectroscopy technique

Bertrand

Lalande

Jecko

1996

26th European Microwave Conference, 1996

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This paper deals with an electromagnetic analysis by FDTD method of exponentially tapered coplanar stripline (ETCS) antennas used for the material characterisation by spectroscopy technique. This analysis leads to the time and harmonic evolution of radiated fled at every point in the space. The effect of substrate thickness on radiation properties of ETCS antennas, radiation patterns are presented. The received signal is calculated and compared to the experimental signal.

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Broad-band microwave measurements with transient radiation from optoelectronically pulsed antennas

Cited by 76 publications

References 15 publications

T-Ray Sensing and Imaging

T-Ray Sensing and Imaging

Investigation of Absolute Photonic Band Gaps in Two-dimensional Dielectric Structures

Electromagnetic analysis of exponentially tapered coplanar stripline antennas used in coherent microwave transient spectroscopy technique

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