A simple terahertz spectrometer based on a low-reflectivity Fabry-Perot interferometer using Fourier transform spectroscopy

Chen, Li Jin; Kao, Tzeng Fu; Lu, Ja Yu; Sun, Chi‐Kuang

doi:10.1364/oe.14.003840

Cited by 21 publications

(9 citation statements)

References 17 publications

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“…of SPIE 60130I-5 Michelson delay time shows a peak radiation frequency ~ 442GHz which is close to the excitation frequency of the photonic transmitter and the FWHM of the THz radiation is ~50GHz. The experimental result reveals that the radiation from the photonic transmitter is also quasi-CW, following our expectation [25]. Fig.…”

Section: Thz Spectrum Characterizationsupporting

confidence: 78%

“…4(a) and (b) shows the stretched optical excitation pulse width after grating pair and recorded modulated beating pulse at τ=0.42ps Michelson delay time. Its corresponding spatial domain trace of generated THz wave and spectrum measured by Fabry-Perot based THz spectrometer [25] are shown in Fig. 5(a) and (b).…”

Section: Thz Spectrum Characterizationmentioning

confidence: 99%

“…Fig. 4(c) shows that the tunable beating frequency is linear dependence with Michelson delay time, and obtainable tuning range is from 150GHz up to 1.6THz [20,25]. …”

Section: Thz Spectrum Characterizationmentioning

confidence: 99%

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Terahertz biochip based on optoelectronic devices

Chen

Kao

et al. 2005

SPIE Proceedings

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The accurate detection of minute amounts of chemical and biological substances has been a major goal in bioanalytical technology throughout the twentieth century [1]. Fluorescence dye labeling detection remains the effective analysis method [2,3], but it modifies the surroundings of molecules and lowering the precision of detection [4][5][6][7]. An alternative label free detecting tool with little disturbance of target molecules is highly desired. Theoretical calculations and experiments have demonstrated that many biomolecules have intrinsic resonance due to vibration or rotation level transitions [8,9], allowing terahertz (THz)-probing technique as a potential tool for the label-free and noninvasive detection of biomolecules. In this paper, we first ever combined the THz optoelectronic technique with biochip technology to realize THz biosensing. By transferring the edge-coupled photonic transmitter into a thin glass substrate and by integrating with a polyethylene based biochip channel, near field THz detection of the biomolecules is demonstrated. By directly acquiring the absorption micro-spectrum in the THz range, different boiomecules can then be identified according to their THz fingerprints. For preliminary studies, the capability to identity different illicit drug powders is successfully demonstrated. This novel biochip sensing system has the advantages including label-free detection, high selectivity, high sensitivity, ease for sample preparation, and ease to parallel integrate with other biochip functionality modules. Our demonstrated detection capability allows specifying various illicit drug powders with weight of nano-gram, which also enables rapid identification with minute amounts of other important molecules including DNA, biochemical agents in terrorism warfare, explosives, viruses, and toxics.

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Section: Thz Spectrum Characterizationsupporting

confidence: 78%

Section: Thz Spectrum Characterizationmentioning

confidence: 99%

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Terahertz biochip based on optoelectronic devices

Chen

Kao

et al. 2005

SPIE Proceedings

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“…There are several types of FTS; for example, the lamellar grating interferometer [3], Martin-Puplett interferometer [4], low-reflectivity Fabry-Perot interferometer [5] (where the low-reflectivity etalon means that the interferogram is similar to that of the Michelson interferometer) and Michelson interferometer [6]. We use a Michelson interferometer for its simplicity and compactness.…”

Section: The Ftsmentioning

confidence: 99%

A simple Fourier transform spectrometer for terahertz applications

et al. 2012

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A simple Fourier transform spectrometer was designed and constructed for the measurement of detectors, sources, passive devices and materials in the terahertz (THz) range. It can be operated at frequencies between 0.3 and 1.5 THz, using a 50-μm-thick Mylar-film beam splitter. The spectral range can be changed by altering the thickness of the beam splitter. The highest frequency resolution is 750 MHz. We studied the properties of heterodyne detectors including superconductor mixers and semiconductor harmonic mixers, direct detectors including an InSb semiconductor bolometer, superconducting tunnel junctions and the Golay cell, and sources including Gunn oscillators and a microwave source with its multipliers, as well as various materials and passive devices including Si wafers and metal mesh filters. Because of its multiplex and etendue advantages, Fourier transform spectroscopy has become the most efficient way to evaluate the properties of signal sources, samples and detectors in the terahertz (THz) range [1][2][3]. The multiplex advantage is that the interferometer receives information from the entire range of a given spectrum during each time element of a scan, whereas a grating spectrometer receives information from only a narrow band of the spectrum. The etendue advantage is that when the required frequency resolution is much lower than that determined by the throughput, the interferometer has the ability to collect a large amount of energy with no strong limitation on the resolution. This is the situation in the THz range. To evaluate the properties of direct detectors, heterodyne detectors (mixers) and filters fabricated in our laboratory, we designed and constructed a simple Fourier transform spectrometer (FTS) system.

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“…THz interferometric imaging has been used in medical endoscopes [31], detection of concealed objects [32], surface topography [33] and applications in synthetic aperture imaging [34] , [35]. Many types of interferometers have been used for THz interferometry and interferometric imaging including Michelson interferometers [24], [29], Mach-Zehnder interferometers [36], Fabry-Perot interferometers [37], [31], Murty (Shearing) interferometers [38], and…”

Section: Interferometry Is Not a New Technique However Applications mentioning

confidence: 99%

Single-frequency terahertz Michelson interferometer for applications in wood products

Lawyer¹

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There is an ever-growing demand in the wood products industry for cost-effective and compact equipment to ensure wood quality measures and specifications are met. Recently, terahertz (THz) technology has begun to pave the way for new , non-destructive imaging techniques rather than the standard use of X-ray or microwave technology.A prototype THz Michelson interferometer operating at 0.102 THz was developed to measure the indices of refraction and absorption coeffi cients of maple, hemlock and birch. These measurements were compared to the Picometrix system, which uses conventional THz time-domain spectroscopy and has been implemented in an industrial setting for the real-time measurement of the density of OSB flakes . However , the cost and complexity of the Picometrix system prohibits its use for many industrial applications. The interferometer is cost-effective, compact and provides accurate data at low THz frequencies , thus providing an excellent alternative direction for new THz technology in the wood products industry.

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A simple terahertz spectrometer based on a low-reflectivity Fabry-Perot interferometer using Fourier transform spectroscopy

Cited by 21 publications

References 17 publications

Terahertz biochip based on optoelectronic devices

Terahertz biochip based on optoelectronic devices

A simple Fourier transform spectrometer for terahertz applications

Single-frequency terahertz Michelson interferometer for applications in wood products

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