Zobrazeno 1 - 10
of 128
pro vyhledávání: '"Fujii, Shun"'
Publikováno v:
Phys. Rev. B 110, 155418 (2024)
We investigate the intrinsic microscopic mechanism of photon upconversion in air-suspended single-walled carbon nanotubes through photoluminescence and upconversion photoluminescence spectroscopy. Nearly linear excitation power dependence of upconver
Externí odkaz:
http://arxiv.org/abs/2404.03849
We propose and demonstrate hybrid all-optical switching devices that combine silicon nanocavities and two-dimensional semiconductor material. By exploiting the refractive index modulation caused by photo-induced carriers in the two-dimensional materi
Externí odkaz:
http://arxiv.org/abs/2403.18199
Publikováno v:
Phys. Rev. Applied vol. 21 (4), 044047 (2024)
Surface acoustic waves (SAWs) coupled to magnons have attracted much attention because they allow for the long-range transport of magnetic information which cannot be achieved by magnon alone. We employed pulsed laser interferometry to visualize the
Externí odkaz:
http://arxiv.org/abs/2312.07029
Publikováno v:
Nano Lett. 24, 14, 4209-4216 (2024)
Optical nonlinear processes are indispensable in a wide range of applications including ultrafast laser sources, microscopy, metrology, and quantum information technologies. Combinations of the diverse nonlinear processes should further lead to the d
Externí odkaz:
http://arxiv.org/abs/2311.13916
We show theoretically and numerically that mode-locking is feasible with a coupled-cavity system with gain and loss, notably, without any natural saturable absorber. We highlight that in the vicinity of the exceptional point, system $Q$ exhibits subs
Externí odkaz:
http://arxiv.org/abs/2309.05912
Publikováno v:
Laser Photonics Rev 2024, 18, 2301329
Mode-locked ultrashort pulse sources with a repetition rate of up to several tens of gigahertz greatly facilitate versatile photonic applications such as frequency synthesis, metrology, radar, and optical communications. Dissipative Kerr soliton micr
Externí odkaz:
http://arxiv.org/abs/2306.02005
Publikováno v:
Rev Sci Instrum 94, 063003 (2023)
We report on an Er-doped fiber (EDF)-laser-based dual-comb system that allows us to perform triggerless asynchronous optical sampling (ASOPS) pump-probe measurements of ultrafast demagnetization and spin precession in magnetic materials. Because the
Externí odkaz:
http://arxiv.org/abs/2304.03666
Autor:
Fujii, Shun, Wada, Koshiro, Sugano, Ryo, Kumazaki, Hajime, Kogure, Soma, Kato, Yuichiro K., Tanabe, Takasumi
Publikováno v:
Communications Physics, 6, 1 (2023)
Microresonator-based optical frequency combs emitted from high-quality-factor microresonators, also known as microcombs, have opened up new horizons to areas of optical frequency comb technology including frequency metrology, precision sensing, and o
Externí odkaz:
http://arxiv.org/abs/2206.13782
We numerically investigate the deterministic generation of a perfect soliton crystal (PSC) in an optical microresonator functionalized with a saturable absorber (SA). The SA allows the direct formation of a PSC from an initial, periodic Turing roll.
Externí odkaz:
http://arxiv.org/abs/2112.12336
Autor:
Fujii, Shun, Tanaka, Shuya, Ohtsuka, Tamiki, Kogure, Soma, Wada, Koshiro, Kumazaki, Hajime, Tasaka, Shun, Hashimoto, Yosuke, Kobayashi, Yuta, Araki, Tomohiro, Furusawa, Kentaro, Sekine, Norihiko, Kawanishi, Satoki, Tanabe, Takasumi
The demand for high-speed and highly efficient optical communication techniques has been rapidly growing due to the ever-increasing volume of data traffic. As well as the digital coherent communication used for core and metro networks, intensity modu
Externí odkaz:
http://arxiv.org/abs/2111.00895