Resonant tuning fork detector for THz radiation

Willer, Ulrike; Pohlkötter, Andreas; Schade, Wolfgang; Xu, J.; Losco, Tonia; Green, Richard P.; Tredicucci, Alessandro; Beere, Harvey E.; Ritchie, D. A.

doi:10.1364/oe.17.014069

Cited by 18 publications

(11 citation statements)

References 15 publications

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“…Consequently, the equivalent of a large bucket detector may be realized by shining light directly on the tuning fork. This has been demonstrated in the visible to IR frequency regime [92,93] and may find particular use in the far-IR and THz [72][73][74]94].…”

Section: Discussionmentioning

confidence: 94%

“…In addition to the strong background suppression achieved by OIF measurements that we already mentioned, the additional principal advantage is the relative Unauthenticated Download Date | 5/11/18 7:23 AM lack of wavelength sensitivity to the measurement allowing for not only broadband force detection, but also detection in regions where standard photodetectors are impractical or impossible to use, such as in the far IR and THz [72][73][74].…”

Section: Steady-state Oifmentioning

confidence: 99%

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Optically induced forces in scanning probe microscopy

et al. 2014

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Typical measurements of light in the near-field utilize a photodetector such as a photomultiplier tube or a photodiode, which is placed remotely from the region under test. This kind of detection has many draw-backs including the necessity to detect light in the far-field, the influence of background propagating radiation, the relatively narrowband operation of photodetectors which complicates the operation over a wide wavelength range, and the difficulty in detecting radiation in the far-IR and THz. Here we review an alternative near-field light measurement technique based on the detection of optically induced forces acting on the scanning probe. This type of detection overcomes some of the above limitations, permitting true broad-band detection of light directly in the near-field with a single detector. The physical origins and the main characteristics of optical force detection are reviewed. In addition, intrinsic effects of the inherent optical forces for certain operation modalities of scanning probe microscopy are discussed. Finally, we review practical applications of optical force detection of interest for the broader field of the scanning probe microscopy.

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Section: Discussionmentioning

confidence: 94%

Section: Steady-state Oifmentioning

confidence: 99%

Optically induced forces in scanning probe microscopy

et al. 2014

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“…Optical power meters are also used in specialised research, for example in microwave frequency measurement [2]. Advancement in technology, in particular the recent trend towards the use of THz technology in security and biomedicine [3] has led to research into sensors which could accurately measure radiation over a large wavelength range [4].…”

Section: Introductionmentioning

confidence: 99%

“…Tuning forks made from piezoelectric material such as quartz can detect optical radiation with high sensitivity [4]. Tuning forks have already been implemented as optical choppers in optical power meters [8] however in this paper, a new resonant optothermal detector based on a tuning fork for use as an optical power meter is investigated.…”

Section: Introductionmentioning

confidence: 99%

“…Tuning forks have already been implemented as optical choppers in optical power meters [8] however in this paper, a new resonant optothermal detector based on a tuning fork for use as an optical power meter is investigated. It has been reported that quartz tuning forks can respond to incident optical radiation over a wide wavelength range extending from the ultraviolet to the THz region [4]. Standard miniature 8 mm long by 3 mm diameter quartz tuning fork crystals with resonant frequencies of 32.768 kHz and 38.000 kHz are widely available and are mass produced at low cost.…”

Section: Introductionmentioning

confidence: 99%

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Resonant optothermal detector for use as an optical power meter

Walker

2011

2011 IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC)

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We present a method of optical power measurement which can be used to measure optical radiation over a large part of the optical spectrum without switching between different sensor types. Based on resonant optothermal detection using a miniature quartz tuning fork, we find that the use of this method has superior dynamic range in the measurement of optical power. With use of the pyroelectric effect, sensitivities are comparable to standard pyroelectric detectors and measurement of quasi-CW modulated optical signals is a simple task. An optical power meter which uses this method can be put to use as a compact and low cost device in a wide variety of applications.

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Detection of Explosives using Pulsed Laser Fragmentation andMIRSpectroscopy

Mordmueller

Willer

Schade

2012

Encyclopedia of Analytical Chemistry

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Within the past years, an increasing number of optical techniques for the detection of harmful substances has been investigated on account of the threat of terroristic attacks. Optical technologies have the capability to overcome the problems of extensive sample preparation and long measurement cycles that are known from widely used detection techniques such as mass spectrometry and gas chromatography. The threat of bombings has also produced interest in standoff techniques — in addition to checkpoint applications for screening of persons. Even in this field, optical technologies are well suited: to date, Raman spectroscopy and laser‐induced breakdown spectroscopy (LIBS) seem to be the most promising technologies, but other optical methods are permanently developed. Particularly detection in the midinfrared (MIR) spectral region, providing selective fingerprints of molecules in the range from 3 to 11 µm, has experienced a renaissance with development of new laser sources, detectors, and spectroscopic techniques. In this paper, some comparatively new techniques for the detection of explosives in the MIR spectral range, relying on quantum cascade lasers (QCLs) and photoacoustic spectroscopy (PAS), are presented. Another emphasis is put on the indirect detection of explosives via characteristic decomposition products and their active generation with laser‐induced photodissociation techniques.

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Resonant tuning fork detector for THz radiation

Cited by 18 publications

References 15 publications

Optically induced forces in scanning probe microscopy

Optically induced forces in scanning probe microscopy

Resonant optothermal detector for use as an optical power meter

Detection of Explosives using Pulsed Laser Fragmentation andMIRSpectroscopy

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