Prof. Junichiro Kono Profile

Prof. Junichiro Kono

Professor at Rice Univ

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Publications (17)

SPIE Journal Paper | 18 January 2023 Open Access

Terahertz spin dynamics in rare-earth orthoferrites

Xinwei Li, Dasom Kim, Yincheng Liu, Junichiro Kono

PI, Vol. 1, Issue 02, R05, (January 2023) https://doi.org/10.1117/12.10.3788/PI.2022.R05

KEYWORDS: Terahertz radiation, Magnetism, Magnons, Crystals, Iron, Erbium, Spin dynamics, Ultrafast phenomena, Phonons, Polarization

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Proceedings Article | 20 August 2020 Presentation

Plasmons, excitons, and polaritons in aligned carbon nanotubes

Junichiro Kono

Proceedings Volume 11462, 114620A (2020) https://doi.org/10.1117/12.2568230

KEYWORDS: Excitons, Plasmons, Carbon nanotubes, Polaritons, Physics, Semiconductors, Liquids, Fabrication, Absorption, Oscillators

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Proceedings Article | 27 February 2019 Presentation + Paper

Terahertz strong-field physics without a strong external terahertz field

Motoaki Bamba, Xinwei Li, Junichiro Kono

Proceedings Volume 10916, 1091605 (2019) https://doi.org/10.1117/12.2512794

KEYWORDS: Iron, Erbium, Magnons, Magnetism, Terahertz radiation

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Traditionally, strong-field physics explores phenomena in laser-driven matter (atoms, molecules, and solids) that cannot be understood by treating the laser field as a small perturbation. Therefore, the presence of an extremely strong external field is usually a prerequisite for observing strong-field phenomena. However, even in the complete absence of an external electromagnetic field, strong-field phenomena can arise when matter strongly couples with the zero-point field of the quantum vacuum state, i.e., fluctuating electromagnetic waves whose expectation value is zero. This can occur in free space where the matter strongly interacts with a continuum of photon modes, but some of the most striking examples of strong-field physics without an external field occur in a cavity setting, in which an ensemble of two-level atoms resonantly interacts with a single photonic mode of vacuum fields, producing vacuum Rabi splitting. In particular, the nature of the matter-vacuum-field coupled system fundamentally changes when the coupling rate (equal to one half of the vacuum Rabi splitting) becomes comparable to, or larger than, the resonance frequency. In this so-called ultrastrong coupling regime, a non-negligible number of photons exist in the ground state of the coupled system. Furthermore, the coupling rate can be cooperatively enhanced (via so-called Dicke cooperativity) when the matter is comprised of a large number of identical two-level particles, and a quantum phase transition is predicted to occur as the coupling rate reaches a critical value. Low-energy electronic or magnetic transitions in many-body condensed matter systems with large dipole moments are ideally suited for searching for these predicted phenomena. Here, we discuss two condensed matter systems that have shown cooperative ultrastrong interactions in the terahertz frequency range: a Landau-quantized two-dimensional electron gas interacting with high-quality-factor cavity photons, and an Er³⁺ spin ensemble interacting with Fe³⁺ magnons in ErFeO₃.

Proceedings Article | 22 February 2018 Presentation + Paper

Laser-assisted field emission in single-walled carbon nanotubes

Derek Bas, Mark Green, Robert Headrick, Jamie Gengler, Matteo Pasquali, Junichiro Kono, Tsing-Hua Her, Augustine Urbas

Proceedings Volume 10530, 1053012 (2018) https://doi.org/10.1117/12.2290122

KEYWORDS: Acquisition tracking and pointing, Ionization, Ultrafast phenomena, Absorption, Single walled carbon nanotubes, Raman spectroscopy, Optoelectronics, Nanomaterials, Copper, Carbon nanotubes

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Proceedings Article | 20 April 2017 Presentation

Superfluorescent laser sources based on single-wall carbon nanotube films (Conference Presentation)

Zhongqu Long, Yongrui Wang, Kankan Cong, G. Timothy Noe, Junichiro Kono, Alexey Belyanin

Proceedings Volume 10123, 1012317 (2017) https://doi.org/10.1117/12.2256912

KEYWORDS: Semiconductor lasers, Current controlled current source, Carbon nanotubes, Laser sources, Thin films, Semiconductors, Absorption, Luminescence, Electrons

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Proceedings Article | 29 April 2016 Paper

Parallel plate waveguide time domain spectroscopy to study terahertz conductivity of utltrathin materials

Manjakavahoaka Razanoelina, Filchito Bagsican, Iwao Kawayama, Xiang Zhang, Lulu Ma, Hironaru Murakami, Robert Vajtai, Pulickel Ajayan, Junichiro Kono, Daniel Mittleman, Masayoshi Tonouchi

Proceedings Volume 9856, 985605 (2016) https://doi.org/10.1117/12.2225060

KEYWORDS: Terahertz radiation, Waveguides, Terahertz spectroscopy, Spectroscopy, Graphene, Wave propagation, Radio propagation, Dispersion, Chemical vapor deposition, Electromagnetism

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Proceedings Article | 28 May 2015 Paper

Carbon-based terahertz devices

Xiaowei He, Weilu Gao, Qi Zhang, Lei Ren, Junichiro Kono

Proceedings Volume 9476, 947612 (2015) https://doi.org/10.1117/12.2185159

KEYWORDS: Terahertz radiation, Graphene, Sensors, Polarizers, Modulators, Plasmons, Modulation, Carbon nanotubes, Absorption, Plasmonics

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Proceedings Article | 15 September 2014 Open Access

NanoJapan: international research experience for undergraduates program: fostering U.S.-Japan research collaborations in terahertz science and technology of nanostructures

Sarah Phillips, Cheryl Matherly, Junichiro Kono

Proceedings Volume 9188, 918805 (2014) https://doi.org/10.1117/12.2060166

KEYWORDS: Terahertz radiation, Nanotechnology, Internships, Terahertz technology, Nanostructures, Scientific research, Physics, Carbon nanotubes, Terahertz spectroscopy, Nanomaterials

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Proceedings Article | 4 June 2014 Paper

Coherent phonons in carbon based nanostructures

G. Sanders, A. R. Nugraha, K. Sato, J.-H. Kim, Y.-S. Lim, J. Kono, R. Saito, C. Stanton

Proceedings Volume 9083, 908309 (2014) https://doi.org/10.1117/12.2050777

KEYWORDS: Phonons, Single walled carbon nanotubes, Carbon, Electrons, Graphene, Nanostructures, Spectroscopy, Absorption, Carbon nanotubes, Semiconductors

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Proceedings Article | 7 March 2014 Paper

Terahertz and ultrafast dynamics of carriers and phonons in graphene and carbon nanotubes

Weilu Gao, Qi Zhang, Lei Ren, Zehua Jin, Ji-Hee Kim, Junichiro Kono

Proceedings Volume 8984, 89840K (2014) https://doi.org/10.1117/12.2038295

KEYWORDS: Graphene, Terahertz radiation, Phonons, Carbon nanotubes, Modulation, Absorption, Semiconductors, Signal attenuation, Silicon, Ultrafast phenomena

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Proceedings Article | 5 March 2013 Paper

Two photon polymerization lithography for 3D microfabrication of single wall carbon nanotube/polymer composites

Shota Ushiba, Satoru Shoji, Preeya Kuray, Kyoko Masui, Junichiro Kono, Satoshi Kawata

Proceedings Volume 8613, 86130Y (2013) https://doi.org/10.1117/12.2005721

KEYWORDS: Composites, Lithography, Raman spectroscopy, Fabrication, Two photon polymerization, Polymers, Carbon, Nanolithography, Solids, Nanocomposites

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Proceedings Article | 9 October 2012 Paper

Optically detecting spin-split bands in semiconductors in magnetic fields

X. Pan, Y. Sun, D. Saha, G. Sanders, M. Santos, R. Doezema, S. Hayes, G. Khodaparast, H. Munekata, Y. Matsuda, J. Kono, C. Stanton

Proceedings Volume 8461, 84611P (2012) https://doi.org/10.1117/12.931716

KEYWORDS: Magnetism, Semiconductors, Gallium arsenide, Magnetic semiconductors, Chromium, Spin polarization, Manganese, Quantum wells, Absorption, Spintronics

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Proceedings Article | 7 February 2009 Paper

Possible applications of (III,Mn)V ferromagnetic semiconductors for optoelectronic devices

Alexander Umnov, Takao Naito, Hiro Munekata, Chanjuan Sun, Junichiro Kono

Proceedings Volume 7212, 72120X (2009) https://doi.org/10.1117/12.809188

KEYWORDS: Magnetism, Polarization, Semiconductors, Magnetic semiconductors, Switches, Optoelectronic devices, Attenuators, Group III-V semiconductors, Optoelectronics, Ferromagnetics

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Proceedings Article | 22 February 2008 Paper

Mid/far-infrared photodetection based on resonant frequency up-conversion in coupled quantum wells

Aleksander Wójcik, Feng Xie, V. Chaganti, Alexey Belyanin, Junichiro Kono

Proceedings Volume 6889, 688914 (2008) https://doi.org/10.1117/12.760992

KEYWORDS: Quantum wells, Avalanche photodetectors, Sensors, Heterojunctions, Mid-IR, Signal detection, Photodetectors, Semiconductors, Nonlinear optics, Semiconductor lasers

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Proceedings Article | 8 February 2007 Paper

Nonlinear optics with intersubband transitions in high-band offset heterostructures

Feng Xie, V. Chaganti, Alexey Belyanin, Alisja Idziaszek, Junichiro Kono, Shigehiko Sasa, Masataka Inoue

Proceedings Volume 6485, 64850V (2007) https://doi.org/10.1117/12.714273

KEYWORDS: Second-harmonic generation, Electrons, Nonlinear optics, Heterojunctions, Quantum cascade lasers, Absorption, Quantum wells, Doping, Mid-IR, Gallium antimonide

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Proceedings Article | 29 April 1999 Paper

Direct observation of intraband carrier relaxation phenomena in semiconductors with a picosecond free-electron laser

Alec Mitchell, Alan Chin, Junichiro Kono

Proceedings Volume 3617, (1999) https://doi.org/10.1117/12.347125

KEYWORDS: Picosecond phenomena, Magnetism, Near infrared, Terahertz radiation, Chromium, Electrons, Absorption, Free electron lasers, Gallium arsenide, Silicon

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Proceedings Article | 16 October 1997 Paper

Near-infrared spectroscopy of terahertz-driven semiconductor nanostructures

Junichiro Kono, Mark Su, Kent Nordstrom, J. Cerne, Mark Sherwin, S. Allen, Tohru Noda, T. Inoshita, Hiroyuki Sakaki

Proceedings Volume 3153, (1997) https://doi.org/10.1117/12.279378

KEYWORDS: Excitons, Terahertz radiation, Near infrared, Magnetism, Semiconductors, Quantum wells, Photons, Spectroscopy, Free electron lasers, Polarization

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Showing 5 of 17 publications

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