HOKKAIDO UNIVERSITY Graduate School of Engineering Division of Applied Physics Applied Physics and Engineering Course Japanese version
Laboratory of Nonlinear Optics and Laser Physics

Research

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Publications (Optical Vortex)

2016

[1] Fuyuto Takahashi, Katsuhiko Miyamoto, Hirofumi Hidai, Keisaku Yamane, Ryuji Morita & Takashige Omatsu, "Picosecond optical vortex pulse illumination forms a monocrystalline silicon needle,"
Scientific Reports (Nature Publishing Group) 6, Article number: 21738 (2016) (OPEN ACCESS)
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Research Press Release : High-Speed and Fully-Quantitative Evaluation of the Polarization Distribution of a Radially Polarized Laser Beam
"Successful formation of a silicon needle," Science and Technology Research News (2016/3/24)

[2] K. Shigematsu, K. Yamane, R. Morita, and Y. Toda, "Coherent dynamics of exciton orbital angular momentum transferred by optical vortex pulses,"
Phys. Rev. B 93, 045205 (2016)
Hokkaido University collection of Scholarly and Academic PapersAvailable on HUSCAP (FREE!)

[3] K. Yamane, M. Sakamoto, N. Murakami, R. Morita, and K. Oka, "Picosecond rotation of a ring-shaped optical lattice by using a chirped vortex-pulse pair,"
Ope. Lett. 41, 4597-4600 (2016)

[4] Masato Suzuki, Keisaku Yamane, Kazuhiko Oka, Yasunori Toda and Ryuji Morita, " Analysis of the Pancharatnam-Berry phase of vector vortex states using the Hamiltonian based on the Maxwell-Schrödinger equation,"
Phys. Rev. A 94, 043851 (2016)
Hokkaido University collection of Scholarly and Academic PapersAvailable on HUSCAP (FREE!)

[5] K. Shigematsu, M. Suzuki, K. Yamane, R. Morita, and Y. Toda, "Snap-shot optical polarization spectroscopy using radially polarized pulses,"
Applied Physics Express 9, 122401 (2016) (OPEN ACCESS)
Selected by 2016 Spotlights!

2015

[1] Masato Suzuki, Keisaku Yamane, Kazuhiko Oka, Yasunori Toda, and Ryuji Morita, "Full Quantitative Analysis of Arbitrary Cylindrically Polarized Pulses by Using Extended Stokes Parameters,"
Scientific Reports (Nature Publishing Group) 5, Article number: 17797 (2015)(OPEN ACCESS)
Research Press Release : High-Speed and Fully-Quantitative Evaluation of the Polarization Distribution of a Radially Polarized Laser Beam
"High-Speed and Fully-Quantitative Evaluation of the Polarization Distribution of a Radially Polarized Laser Beam," Science and Technology Research News (2015/12/29)
Hokkaido University collection of Scholarly and Academic PapersAvailable on HUSCAP (FREE!)

2014

[1] Keisaku Yamane, Zhili Yang, Yasunori Toda, and Ryuji Morita, "Frequency-resolved measurement of the orbital angular momentum spectrum of femtosecond ultra-broadband optical-vortex pulses based on field reconstruction,"
New Journal of Physics 16, 053020 (2014) (OPEN ACCESS)

[2] Masato Suzuki, Keisaku Yamane, Kazuhiko Oka, Yasunori Toda, and Ryuji Morita, "Nonlinear coupling between axisymmetrically-polarized ultrashort optical pulses in a uniaxial crystal,"
Optics Express 22, Issue 14, pp. 16903-16915 (2014) (OPEN ACCESS)
Hokkaido University collection of Scholarly and Academic PapersAvailable on HUSCAP (FREE!)
KEYWORDS: Vector Vortex, Cylindrically Vector Vortex, Optical Vortex, Poincare´ sphere, Stokes parameters, Extended Stokes Parameters, Radially Polarized Vortex, Azimuthally Polarized Voertex, Nonlinear Propagation, Four Wave Mixing, Kerr Effect, Self Phase Modulation, Cross Phase Modulation

[3] Masato Suzuki, Keisaku Yamane, Kazuhiko Oka, Yasunori Toda, and Ryuji Morita, "Extended Stokes Parameters for Cylindrically-Polarized Beams,"
Optical Review 22, Issue 1, pp. 179-183 (2015) (OPEN ACCESS)
Hokkaido University collection of Scholarly and Academic PapersAvailable on HUSCAP (FREE!)
KEYWORDS: Polarized Vortex, Vector Vortex, Cylindrically Vector Vortex, Optical Vortex, Poincare' sphere, Pancharatnam–Berry phase, Stokes parameters, Radially Polarized Vortex, Azimuthally Polarized Voertex, Higher-Order Poincare' Sphere

2013

[1] Kohei Toyoda, Fuyuto Takahashi, Shun Takizawa, Yu Tokizane, Katsuhiko Miyamoto, Ryuji Morita, and Takashige Omatsu, "Transfer of Light Helicity to Nanostructures,"
Phys. Rev. Lett. 110, 143603 (2013)

[2]Kyohhei Shigematsu, Yasunori Toda, Keisaku Yamane, Ryuji Morita, "Orbital angular momentum spectral dynamics of GaN excitons excited by optical vortices,"
Jpn. J. Appl. Phys. 52 (2013)(FREE!)

[3] Moritsugu Sakamoto, Kazuhiko Oka, Ryuji Morita, and Naoshi Murakami, "Stable and flexible ring-shaped optical-lattice generation by use of axially symmetric polarization elements,"
Optics Letters, Vol. 38, Issue 18, pp. 3661-3664 (2013)

[4] Y. Toda, K. Shigematsu, K. Yamane, R. Morita, "Efficient Laguerre-Gaussian mode conversion for orbital angular momentum resolved spectroscopy,"
Optics Communications, Vol. 308, Issue 1, pp. 147-151 (2013)

2012

[1] Keisaku Yamane, Yasunori Toda, and Ryuji Morita, "Ultrashort optical-vortex pulse generation in few-cycle regime,"
Optics Express, Vol. 20, Issue 17, pp. 18986-18993 (2012) (OPEN ACCESS)
Hokkaido University collection of Scholarly and Academic PapersAvailable on HUSCAP (FREE!)

[2] Kohei Toyoda, Katsuhiko Miyamoto, Nobuyuki Aoki, Ryuji Morita, and Takashige Omatsu, "Using Optical Vortex To Control the Chirality of Twisted Metal Nanostructures,"
Nano Lett., 2012, 12 (7), pp 3645–3649

2010

[1] Takashige Omatsu, Keisuke Chujo, Katsuhiko Miyamoto, Masahito Okida, Kazuki Nakamura, Nobuyuki Aoki, and Ryuji Morita, "Metal microneedle fabrication using twisted light with spin," Optics Express, Vol. 18, Issue 17, pp. 17967-17973 (2010) (OPEN ACCESS)
Hokkaido University collection of Scholarly and Academic PapersAvailable on HUSCAP (FREE!)

[2] Y. Toda, S. Honda, and R. Morita, "Dynamics of a paired optical vortex generated by second-harmonic generation," Optics Express, Vol. 18, Issue 17, pp. 17796-17804 (2010) (OPEN ACCESS)

[3] Hamazaki, Junichi, Morita Ryuji, Chujo Keisuke, Kobayashi Yusuke. Tanda Satoshi. Omatsu Takashige, "Optical-vortex laser ablation," Optics Express, Vol. 18, Issue 3, pp. 2144-2151 (2010) (OPEN ACCESS)
Hokkaido University collection of Scholarly and Academic PapersAvailable on HUSCAP (FREE!)

2009

[1] Yu Tokizane, Katsuhiro Shimatake, Yasunori Toda, Kazuhiko Oka, Masakatsu Tsubota, Satoshi Tanda, and Ryuji Morita, "Global evaluation of closed-loop electron dynamics in quasi-one-dimensional conductors using polarization vortices," Optics Express, Vol. 17, Issue 26, pp. 24198-24207 (2009) (OPEN ACCESS)

[2] Y. Ueno, Y. Toda, S. Adachi, R. Morita, and T. Tawara, "Coherent transfer of orbital angular momentum to excitons by optical four-wave mixing," Optics Express, Vol. 17, Issue 22, pp. 20567-20574 (2009) (OPEN ACCESS)

[3] Yu Tokizane, Kazuhiko Oka, and Ryuji Morita, "Supercontinuum optical vortex pulse generation without spatial or topological-charge dispersion," Optics Express, Vol. 17, Issue 17, pp. 14517-14525 (2009) (OPEN ACCESS)

[4] M. Okida, Y. Hayashi, T. Omatsu, J. Hamazaki, R. Morita, "Characterization of 1.06μm optical vortex laser based on a side-pumped Nd:GdVO4 bounce oscillator," Applied Physics B, April 2009, Volume 95, Issue 1, pp 69-73

[5]Yasunori Toda, Koshi Nagaoka, Katsuhiro Shimatake, Ryuji Morita, "Generation and spatiotemporal evolution of optical vortices in femtosecond laser pulses," Electrical Engineering in Japan Volume 167, Issue 4, pages 39–46, June 2009