109 citations · 270 across the 13 of their papers we have counts for
13 papers
Mid-infrared spontaneous and stimulated emission dynamics in black phosphorus
Hisashi Sumikura, Akihiko Shinya, Masaya Notomi
Black phosphorus (BP) has attracted attention as a light-emitting layered semiconductor for mid-infrared (MIR) photonics owing to its direct and thickness-tunable bandgap energy, h…
Silicon photonic optical-electrical-optical converters based on load-resistor and current-injection operation
Masaya Arahata, Shota Kita, Akihiko Shinya +2
Optical-electrical-optical (OEO) converters are key primitives for low-latency, energy-efficient photonic computing because they enable nonlinear activation and optical signal rege…
Higher-order exceptional points unveiled by nilpotence and mathematical induction
Kenta Takata, Adam Mock, Masaya Notomi +1
Non-Hermitian systems can have peculiar degeneracies of eigenstates called exceptional points (EPs). An EP of degenerate states is said to have order , and higher-order EPs…
On-chip room-temperature CW lasing from a III-V nanowire integrated with a Si photonic crystal platform
Masato Takiguchi, Takuro Fujii, Hisashi Sumikura +3
We report the demonstration of continuous-wave (CW) lasing at room temperature from a III-V semiconductor nanowire integrated into a Si photonic crystal (PhC) cavity. Conventional…
Optoelectronic recurrent neural network using optical-electrical-optical converters with RC delay
Masaya Arahata, Shota Kita, Kazuo Aoyama +3
Optical neural network (ONN) has been attracting intense attention owing to their low latency and low-power consumption. Among the ONNs, optical recurrent neural network (RNN) enab…
Vector beam generation from standing hollow GaN nanowire lasers on sapphire substrate
Masato Takiguchi, Sylvain Sergent, Benjamin Damilano +9
We fabricated GaN based hollow nanowires standing upright on a sapphire substrate by the sublimation method and found that they exhibit laser oscillation at room temperature. These…
Improved design and experimental demonstration of ultrahigh-Q C-symmetric H1 hexapole photonic crystal nanocavities
Kenta Takata, Eiichi Kuramochi, Akihiko Shinya +1
An H1 photonic crystal nanocavity is based on a single point defect and has eigenmodes with a variety of symmetric features. Thus, it is a promising building block for photonic tig…
Imaginary couplings in non-Hermitian coupled-mode theory: Effects on exceptional points of optical resonators
Kenta Takata, Nathan Roberts, Akihiko Shinya +1
Exceptional point (EP) degeneracies in coupled cavities with gain and loss provide on-chip photonic devices with unconventional features and performance. However, such systems with…
Observing exceptional point degeneracy of radiation with electrically pumped photonic crystal coupled-nanocavity lasers
Kenta Takata, Kengo Nozaki, Eiichi Kuramochi +6
Controlling gain and loss of coupled optical cavities can induce non-Hermitian degeneracies of eigenstates, called exceptional points (EPs). Various unconventional phenomena around…
Photon correlation measurements of stochastic limit cycles emerging from high- nonlinear silicon photonic crystal microcavities
N. Takemura, M. Takiguchi, H. Sumikura +3
We performed measurements of photon correlation [] in driven nonlinear high- silicon (Si) photonic crystal (PhC) microcavities. The measured exhibits a…
All-optical dynamic modulation of spontaneous emission rate in hybrid optomechanical cavity quantum electrodynamics systems
Feng Tian, Hisashi Sumikura, Eiichi Kuramochi +4
Recent nanofabrication technologies have miniaturized optical and mechanical resonators, and have led to a variety of novel optomechanical systems in which optical and mechanical m…
Continuous-wave operation and 10-Gb/s direct modulation of InAsP/InP sub-wavelength nanowire laser on silicon photonic crystal
Masato Takiguchi, Atsushi Yokoo, Kengo Nozaki +6
We demonstrated sub-wavelength (~111 nm diameter) single nanowire (NW) continuous wave (CW) lasers on silicon photonic crystal in the telecom-band with direct modulation at 10 Gb/s…
All-silicon sub-Gb/s telecom detector with low dark current and high quantum efficiency on chip
Takasumi Tanabe, Hisashi Sumikura, Hideaki Taniyama +2
We demonstrate channel selective 0.1-Gb/s photo-receiver operation at telecom wavelength using a silicon high-Q photonic crystal nanocavity with a laterally integrated p-i-n diode.…