Applications of holography in the millimeter-wave and terahertz region

McAuley, Ian; Murphy, John A.; Trappe, N.; Mahon, R.; McCarthy, D.; McLaughlin, P.

doi:10.1117/12.873821

Cited by 8 publications

(7 citation statements)

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“…Ruffin et al have demonstrated time-reversal imaging that can be considered as 2D holographic imaging in the Figure 9 Experimental setup for off axis terahertz hologram recording taken from [158] time-domain [155]. Millimeter Wave [156,157] or Terahertz holography [158] provides high fidelity images for targets consisting of scattered points located at well-separated planes [159]. However it has a number of pertinent deficiencies.…”

Section: D Holographymentioning

confidence: 99%

Review of Terahertz Tomography Techniques

Guillet

Recur

Frederique

et al. 2014

J Infrared Milli Terahz Waves

207

104

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Section: D Holographymentioning

confidence: 99%

Review of Terahertz Tomography Techniques

Guillet

Recur

Frederique

et al. 2014

J Infrared Milli Terahz Waves

207

104

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“…A useful setup for this purpose is that used in the recording of a hologram in off-axis digital holography in the millimeter waveband, as reported in [7][8][9]. In [7], Mahon et al described how an image could be reconstructed numerically from a digital hologram recorded at millimeter wavelengths in the case of a BM^-shaped mask.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Phase Centers of Millimeter-Wave Horn Antennas Using a Holographic Interference Technique

McAuley

Murphy

McCarthy

et al. 2016

J Infrared Milli Terahz Waves

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In this paper, we discuss how a holographic interference technique can be applied in the experimental determination of the phase centers of non-standard horn antennas in the millimeter-waveband. The phase center is the point inside the horn from which the radiation appears to emanate when viewed from the far-field, and knowing its location is necessary for optimizing coupling efficiencies to quasi-optical systems. For non-standard horn designs, and other feed structures, the phase center may be difficult to reliably predict by simulation, in which case, before committing to antenna manufacture, there is a requirement for it to be determined experimentally. Although the phase center can be recovered by direct phase measurement of the far-field beam pattern, this usually involves expensive instrumentation such as a vector network analyzer for millimeter wave horn antennas. In this paper, we describe one inexpensive alternative, which is based on measuring the interference pattern in intensity between the radiation from the horn of interest and a reference beam derived from the same coherent source in an off-axis holography setup. The accuracy of the approach is improved by comparison with the interference pattern of a well-understood standard horn (such as a corrugated conical horn) in the same experimental setup. We present an example of the technique applied to a profiled smooth-walled horn antenna, which has been especially designed for cosmic microwave background (CMB) polarization experiments.

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“…Terahertz (THz) digital holography is a combination of THz technology and digital holography which has drawn wide attention [1][2][3][4][5] . One important characteristic of digital holography is that the numerical reconstruction of an imaging object can be finished at a random reconstruction distance.…”

Section: Introductionmentioning

confidence: 99%

Autofocusing research on terahertz off-axis digital holography

et al. 2014

SPIE Proceedings

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Terahertz (THz) digital holography is a combination of THz technology and digital holography which has drawn wide attention. Exact measurements of real recording distances in terahertz (THz) digital holography are important. Autofocusing experimental researches have been conducted based on the holograms in THz off-axis digital holography. Five criterion functions are utilized in this paper. Autofocusing performance of these criterion functions has been analyzed and compared by changing the numbers of the superposition frames of holograms. Experiment results show that five criterion functions all have preferable autofocusing performance with the 5-frame averaged holograms; standard deviation-based correlation criterion function has the worst autofocusing performance.

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Applications of holography in the millimeter-wave and terahertz region

Cited by 8 publications

References 0 publications

Review of Terahertz Tomography Techniques

Review of Terahertz Tomography Techniques

Determination of the Phase Centers of Millimeter-Wave Horn Antennas Using a Holographic Interference Technique

Autofocusing research on terahertz off-axis digital holography

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