Spatiotemporal observations of light propagation in multiple polarization states

Inoue, Tomoyoshi; Matsunaka, Atsushi; Funahashi, Akinori; Okuda, Tatsuya; Nishio, K.; Awatsuji, Yasuhiro

doi:10.1364/ol.44.002069

Cited by 17 publications

(4 citation statements)

References 30 publications

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“…Light-in-flight recording by holography (LIF holography) is a powerful tool for observing a propagating light pulse in the form of a motion picture 19 – 23 . LIF holography can, in principle, record a motion picture of the light pulse propagation with a single shot because the technique does not require repetitive ultrashort light pulses.…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal observation of light propagation in a three-dimensional scattering medium

Inoue

Yuasa

Itoh

et al. 2021

Sci Rep

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Spatiotemporal information about light pulse propagation obtained with femtosecond temporal resolution plays an important role in understanding transient phenomena and light–matter interactions. Although ultrafast optical imaging techniques have been developed, it is still difficult to capture light pulse propagation spatiotemporally. Furthermore, imaging through a three-dimensional (3-D) scattering medium is a longstanding challenge due to the optical scattering caused by the interaction between light pulse and a 3-D scattering medium. Here, we propose a technique for ultrafast optical imaging of light pulses propagating inside a 3D scattering medium. We record an image of the light pulse propagation using the ultrashort light pulse even when the interaction between light pulse and a 3-D scattering medium causes the optical scattering. We demonstrated our proposed technique by recording converging, refracted, and diffracted propagating light for 59 ps with femtosecond temporal resolution.

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Section: Introductionmentioning

confidence: 99%

Spatiotemporal observation of light propagation in a three-dimensional scattering medium

Inoue

Yuasa

Itoh

et al. 2021

Sci Rep

Self Cite

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“…The triangles in Figure 1 show imaging devices having achieved STR [2][3][4][5][6][7][8][9][10][11][12][13][14]. Some of which are presented with motion pictures on the page for Invited Speakers on the webpage of ICHSIP31 [15].…”

Section: Introductionmentioning

confidence: 99%

Toward the Super Temporal Resolution Image Sensor with a Germanium Photodiode for Visible Light

Ngo

Nguyen

Bufler

et al. 2020

Sensors

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The theoretical temporal resolution limit tT of a silicon photodiode (Si PD) is 11.1 ps. We call “super temporal resolution” the temporal resolution that is shorter than that limit. To achieve this resolution, Germanium is selected as a candidate material for the photodiode (Ge PD) for visible light since the absorption coefficient of Ge for the wavelength is several tens of times higher than that of Si, allowing a very thin PD. On the other hand, the saturation drift velocity of electrons in Ge is about 2/3 of that in Si. The ratio suggests an ultra-short propagation time of electrons in the Ge PD. However, the diffusion coefficient of electrons in Ge is four times higher than that of Si. Therefore, Monte Carlo simulations were applied to analyze the temporal resolution of the Ge PD. The estimated theoretical temporal resolution limit is 0.26 ps, while the practical limit is 1.41 ps. To achieve a super temporal resolution better than 11.1 ps, the driver circuit must operate at least 100 GHz. It is thus proposed to develop, at first, a short-wavelength infrared (SWIR) ultra-high-speed image sensor with a thicker and wider Ge PD, and then gradually decrease the size along with the progress of the driver circuits.

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“…然而, ICCD的时间分辨率只有2 ns, 条纹相机只能记录一维空间信息, 发射光谱法和汤姆孙散射法都不具空间分辨能力; 激光探针法具有结构简单、测量精度高的优点, 是这些方法中应用最为广泛的, 但是传统的激光探针法需要多次重复LIP的物理过程才能捕捉其全面时空特性. 很多全光学链路的时空分辨光学探针被提出用于取代传统的激光探针法, 这些光学探针可以分为: 时间波长编码的光学探针 [12,13] 、时间空间编码的光学探针 [14] 、时间角度编码的光学探针 [15,16] 、时间空间频率编码的光学探针 [17,18] 、时间偏振编码的光学探针 [19,20]…”

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Wavelength encoded single-shot high-spatiotemporal resolution all-optical probe

Yi,

Ding,

Zhu

et al. 2023

Acta Phys. Sin.

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The laser probe method is one of the main techniques for capturing ultrafast dynamic processes and has extensive applications in fields such as plasma physics, photochemistry, and biomedical science. In this paper, a time-wavelength encoding optical probe generation scheme is proposed, which uses cascaded frequency doubling crystals with different phasematching angles and independent delay lines to achieve time-wavelength encoding. This method offers single-shot high spatiotemporal resolution, high frame rate, a wide range of adjustable time windows. The temporal resolution of the optical probe depends on the pulse width of the second harmonic, which can be adjusted by changing the phase-matching angle of the frequency doubling crystal. The time window of the optical probe is only related to the change in the delay line, which can be adjusted by changing the length of the delay line. Therefore, the time resolution and time window of the optical probe are independent of each other. An optical probe generation system was constructed with 247 fs temporal resolution, 4 μm spatial resolution, 4.05 THz maximal frame rate, and an adjustable time window from sub-picosecond to 3 ns. The threedimensional spatiotemporal evolution process of plasma filaments was captured within a single shot using the optical probe. The experimental results showed that the ionization front of the plasma propagated forward at a velocity of (2.963 ± 0.024) × 108 m/s,which was consistent with the theoretical prediction. This demonstrated the feasibility of using the probe for capturing ultrafast events. In the discussion, we analyzed that the key parameters of the optical probe can reach a maximum frame rate of 35.7 THz, a maximum time resolution of 28 fs, and a time window range that can be adjusted from hundreds of femtoseconds to tens of nanoseconds. Finally, the optimal design parameters of the optical probe are given for different application scenarios. The optical probe generation scheme has good scalability and versatility, and can be combined with any wavelength decoding device, diffraction imaging, holographic imaging, tomography scanning, and other technologies. The high spatiotemporal resolution of the optical probe and the independent adjustability of its parameters provide a feasible solution for single-shot high spatiotemporal resolution captures of ultrafast dynamic processes at multiple time scales.

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Spatiotemporal observations of light propagation in multiple polarization states

Cited by 17 publications

References 30 publications

Spatiotemporal observation of light propagation in a three-dimensional scattering medium

Spatiotemporal observation of light propagation in a three-dimensional scattering medium

Toward the Super Temporal Resolution Image Sensor with a Germanium Photodiode for Visible Light

Wavelength encoded single-shot high-spatiotemporal resolution all-optical probe

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