Continuous-wave terahertz phase imaging using a far-infrared laser interferometer

Wang, Yingxin; Zhao, Ziran; Chen, Zhiqiang; Zhang, Li; Kang, Kejun; Jing-Kang, Deng

doi:10.1364/ao.50.006452

Cited by 29 publications

(18 citation statements)

References 27 publications

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“…where f is the carrier frequency, which could give the additional information to an ordinary THz amplitude image. 10 In this letter, we report an observation of geometrically induced phase shift of THz waves and its application to THz imaging of sub-wavelength-scale objects. In an experiment of THz wave generation from semiconducting InAs structure, we found that the pulses radiated from emitters of subwavelength scale are temporally shifted compared to the ones from large emitters.…”

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confidence: 97%

Terahertz phase microscopy in the sub-wavelength regime

Lee

Song

et al. 2012

Applied Physics Letters

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The consequences of high injected carrier densities on carrier localization and efficiency droop in InGaN/GaN quantum well structures J. Appl. Phys. 111, 083512 (2012) Critical dimensions of highly lattice mismatched semiconductor nanowires grown in strain-releasing configurations Appl. Phys. Lett. 100, 163108 (2012) Structural properties of InN films grown on O-face ZnO(000) by plasma-assisted molecular beam epitaxy Appl. Phys. Lett. 100, 152105 (2012) Spontaneous emission control of single quantum dots in bottom-up nanowire waveguides Appl. Phys. Lett. 100, 121106 (2012) Europium location in the AlN: Eu green phosphor prepared by a gas-reduction-nitridation route

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confidence: 97%

Terahertz phase microscopy in the sub-wavelength regime

Lee

Song

et al. 2012

Applied Physics Letters

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“…It is reported that phase imaging is more sensitive to the component pattern of a specimen than amplitude and timeof-flight imaging [24]. In [25], phase imaging is used to reveal the depth information of an optically opaque object and provides much better contrast for weak-absorption materials. The spectral phase, derived from a typical time-domain terahertz waveform by Fourier transform, is essentially linear [26].…”

Section: Introductionmentioning

confidence: 99%

“…Phase distribution allows the reconstruction of the Teflon object thickness pattern in low SNR registration conditions [27]. In summary, amplitude spectra are suitable for characterization of strong absorption materials [23], whereas phase spectra contain more significant information and exhibit linear behavior, thus outperforming amplitude spectra for weak-absorption and transparent materials, low SNR, and thin-film cases [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Measurement of Paper Basis Weight Using Phase Shift in Terahertz Time-Domain Spectroscopy

2017

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THz time-domain spectroscopy has evolved as a noncontact, safe, and efficient technique for paper characterization. Our previous work adopted peak amplitude and delay time as features to determine paper basis weight using terahertz time-domain spectroscopy. However, peak amplitude and delay time tend to suffer from noises, resulting in degradation of accuracy and robustness. This paper proposes a noise-robust phase-shift based method to enhance measurements of paper basis weight. Based on Fresnel Formulae, the physical relationship between phase shift and paper basis weight is formulated theoretically neglecting multiple reflections in the case of normal incidence. The established formulation indicates that phase shift correlates linearly with paper basis weight intrinsically. Subsequently, paper sheets were stacked to fabricate the samples with different basis weights, and experimental results verified the developed mathematical formulation. Moreover, a comparison was made between phase shift, peak amplitude, and delay time with respect to linearity, accuracy, and noise robustness. The results show that phase shift is superior to the others.

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“…Combining this interferometer with our imaging systems, a continuous-wave THz phase imaging system53 is now under construction.…”

Section: Resultsmentioning

confidence: 99%

Applications using high-Tc superconducting terahertz emitters

Nakade

Kashiwagi

Saiwai

et al. 2016

Sci Rep

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Using recently-developed THz emitters constructed from single crystals of the high-Tc superconductor Bi2Sr2CaCu2O8+δ, we performed three prototype tests of the devices to demonstrate their unique characteristic properties for various practical applications. The first is a compact and simple transmission type of THz imaging system using a Stirling cryocooler. The second is a high-resolution Michelson interferometer used as a phase-sensitive reflection-type imaging system. The third is a system with precise temperature control to measure the liquid absorption coefficient. The detailed characteristics of these systems are discussed.

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Continuous-wave terahertz phase imaging using a far-infrared laser interferometer

Cited by 29 publications

References 27 publications

Terahertz phase microscopy in the sub-wavelength regime

Terahertz phase microscopy in the sub-wavelength regime

Enhanced Measurement of Paper Basis Weight Using Phase Shift in Terahertz Time-Domain Spectroscopy

Applications using high-Tc superconducting terahertz emitters

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