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We demonstrated directly modulated telecom-band sub-wavelength (diameter ∼114 nm) nanowire lasers on silicon photonic crystal for the first time. The dynamic properties were estimated using a photon counting system. A 10Gb/s opened eye-diagram was obtained.
We first propose a two-dimensional photonic crystal platform for optomechanically modulating the spontaneous emission. The platform consists of two slotted photonic crystal cavities for optomechanical pumping and emission enhancement respectively, where there is a shared barrier oscillator to bridge the optomechanical dynamics of these two cavities.
We demonstrated an InAsP/InP nanowire laser (diameter ∼100 nm) in telecommunication band on an Si photonic crystal platform. By measuring light-in versus light-out curves, linewidth, emission rate, and photon correlation, lasing oscillation has been unambiguously demonstrated.
By adopting high β buried-multiple-quantum-well photonic crystal nanocavities, we have demonstrated smooth lasing operation, which indicates thresholdless-like lasing theoretically predicted, by mean of light-in versus light-out curve analysis, linewidth analysis, and photon correlation measurements.
We fabricated a unique system in which a semiconductor nanowire and a gold bowtie nanoantenna are combined. InP nanowire is precisely placed in the nanogap of the nanoantenna with a nanomanipulator installed in a focused ion beam system. By measuring the intensity mapping of the photoluminescence from the nanowire, we observed a significantly large enhancement at the antenna gap. We also calculated...
A photonic-crystal nanocavity is induced by a III/V nanowire in a line defect in a Si photonic crystal with several serially-connected lattice constants. The resonant wavelength changes by moving the nanowire along the line defect.
We propose a new design for buried heterostructure photonic crystal nanocavity lasers with in-line coupled output waveguides and coupling buffer regions. This design enables us to realize single-mode lasing and a high output power for a current-injected nanolaser.
We propose a position controlled nanocavity from a single semiconductor nanowire inside a slot of photonic crystals. A cavity is created by modifying the refractive index in the line defect using a nanowire. Preliminary experiments are shown.
Buried-heterostructure photonic-crystal cavities strongly confine photons and carriers. Here, we demonstrate that we can greatly enhance and suppress the spontaneous emission rate in them by the cavity quantum-electrodynamics effect.
We successfully increase the output power of an electrically driven photonic crystal laser. By using a six-quantum-well structure and decreasing the series resistance, the device, having 32-μA threshold current, exhibits 39.3-μW output power. We also demonstrate bit-error rate measurements with 10-Gbit/s signal without using optical amplifier.
It has been over two decades since 3D photonic band gaps were proposed to strongly confine light in a small space [1], but the proposed strong light confinement was achieved just recently in a slightly different form. Recent progress in nano-fabrication technologies enabled high-quality 2D photonic crystals, and various high-Q microcavities have been now realized in them. Among these photonic crystals...
The authors review their recent studies on various nanophotonic devices including all-optical switches, optical memories, electro-optic modulators, photo-detectors and lasers, all of which are based on photonic crystal (PhC) nanocavities. The strong light confinement achieved in PhC nanocavities has enabled these devices with ultrasmall footprint and ultralow power/energy consumption. These characteristics...
We experimentally observed optomechanical response of photonic crystal slabs separated by a thin air gap. Reflectance measurement reveals photonic crystal slabs are mechanically displaced by optical pumping.
We demonstrate all-optical bistable memory operation with InGaAsP photonic crystal nanocavities based on refractive index modulation caused by carrier-induced nonlinearity. The minimum bias power for bistability is extremely low at 40 muW and the operating energy required for switching is only 30 fJ.
We analyze photonic crystal based optical nanocavity structures. The result indicates that the photonic crystal based cavity structure has the promising application toward optomechanics. The structure also has a potential application for cavity-QED due to large Q-factor and small modal volume.
A pulse delay more than ten times the pulse width was experimentally achieved in low-loss coupled cavity waveguides formed by 300 photonic crystal nanocavities.
Recently, various wavelength-sized cavities with theoretical Q values of ~108 have been reported, however, they all employ 2 D or 3 D photonic band gaps to realize strong light confinement. Here we numerically demonstrate that ultrahigh-Q (2.0 times 108) and wavelength-sized (Veff~1.4(lambda/n)3) cavities can be achieved by employing only 1 D periodicity.
Recent progress in ultrahigh-Q and ultrasmall cavities based on photonic-crystal slabs have impacts on various phenomena. We report our recent investigations of all-optical bistable switching/memory action toward all-optical logic, and novel adiabatic tuning phenomena (wavelength conversion, opto-mechanical energy conversion, and photon dynamic memory).
In this study, we apply recently-developed photonic-crystal ultrahigh-Q nanocavities to on-chip all-optical control, including all-optical bistable nodes towards photonic RAM and all-optical logic, all-dielectric slow-light media, and novel adiabatic wavelength conversion.
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