Scanning laser THz imaging system

Murakami, Hironaru; Serita, Kazunori; Maekawa, Yuki; Fujiwara, Shogo; Matsuda, Eiki; Kim, Sunmi; Kawayama, Iwao; Tonouchi, Masayoshi

doi:10.1088/0022-3727/47/37/374007

Cited by 55 publications

(12 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the current experiment, the instrumental resolution is below 20 fs (root mean square), but the presence of timing 8 In some literature it is called butterfly shape. 9 CST Microwave studio, CST GmbH. 10 Instantaneous regime of extreme-ultraviolet pulse streaking also can be realized by nanoplasmonic field [74].…”

Section: Bowtie Resonator: Electron Pulse and Thz Signal Characterizamentioning

confidence: 99%

“…We have mentioned image-to-image noise, which has a non-correlated origin and can not be avoided. It is difficult to involve this noise in the resolution limit estimation, however, at 9 The size of the evaluated deflection angle (or field) matrices can differ from the size of I k τ if the resolution is changed or the images in the batch are cropped to reduce memory usage.…”

Section: Stepmentioning

confidence: 99%

See 1 more Smart Citation

Electron microscopy of electromagnetic waveforms

Ryabov

Baum

2016

Science

122

111

View full text Add to dashboard Cite

Imaging electromagnetic waveforms Understanding the dynamics of electrons and the spatial and temporal evolution of electromagnetic fields within a material or device is often the key to optimizing performance. Ryabov and Baum show that electron microscopy can be used to measure collective carrier motion and electromagnetic fields with subcycle and subwavelength resolution. As an example, they used a train of compressed electron pulses to produce movies of the electromagnetic excitation in an optical excited metamaterial component. Science , this issue p. 374

show abstract

Section: Bowtie Resonator: Electron Pulse and Thz Signal Characterizamentioning

confidence: 99%

Section: Stepmentioning

confidence: 99%

Electron microscopy of electromagnetic waveforms

Ryabov

Baum

2016

Science

122

111

View full text Add to dashboard Cite

show abstract

“…Unlike other methods, the resolution in LTEM is not limited by the THz wavelength but by that of the optical source, allowing THz-emission spectroscopy and -emission imaging of various samples of sub-micrometer scale achievable. [22][23][24][25] In the recently developed system, a nonlinear optical crystal (NLOC) is employed as a 2D THz emitter, and THz waves are locally generated in the process of optical rectification at the irradiation spots of femtosecond (fs) laser beams. 26 Since the fs laser beams are focused at the output surface of the NLOC, the beam diameter of the generated THz waves is approximately the same size as that of the focused beam spot which overcomes the diffraction limit of THz waves.…”

mentioning

confidence: 99%

Invited Article: Terahertz microfluidic chips sensitivity-enhanced with a few arrays of meta-atoms

et al. 2018

Self Cite

View full text Add to dashboard Cite

We present a nonlinear optical crystal (NLOC)-based terahertz (THz) microfluidic chip with a few arrays of split ring resonators (SRRs) for ultra-trace and quantitative measurements of liquid solutions. The proposed chip operates on the basis of near-field coupling between the SRRs and a local emission of point like THz source that is generated in the process of optical rectification in NLOCs on a sub-wavelength scale. The liquid solutions flowing inside the microchannel modify the resonance frequency and peak attenuation in the THz transmission spectra. In contrast to conventional bio-sensing with far/near-field THz waves, our technique can be expected to compactify the chip design as well as realize high sensitive near-field measurement of liquid solutions without any high-power optical/THz source, near-field probes, and prisms. Using this chip, we have succeeded in observing the 31.8 fmol of ion concentration in actual amount of 318 pl water solutions from the shift of the resonance frequency. The technique opens the door to microanalysis of biological samples with THz waves and accelerates development of THz lab-on-chip devices.

show abstract

“…The LTEM maps the amplitude distribution of terahertz (THz) emission generated by a local photocurrent upon scanning femtosecond laser illumination. 5,6 In a previous report, we revealed that the amplitudes of the THz emission from c-plane GaN are enhanced by defects related to yellow luminescence (YL), and this phenomenon is explained through the modification of the band structures in the surface depletion layer owing to trapped electrons at the defect sites. 7 The LTEM provides a unique tool for visualizing ultrafast photocarrier transport dynamics accelerated or decelerated by a local built-in field.…”

mentioning

confidence: 92%