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H1 photonic crystal nanocavities with a short sub-wavelength air-slot that can concentrate an electric field to one antinode with V<0.025(λ/n)3 experimentally exhibited a Q factor over 2×105 and a Q/V reaching 107.
We demonstrate a photonic-crystal photodetector under a forward bias voltage maintaining a 0.88-A/W responsivity and a 40-Gbit/s bitrate. This will allow an ultralow-energy receiver with high-impedance termination that requires neither amplifiers nor a bias circuit.
Generating correlated photons is an essential technology for photonic quantum information experiments. Increasing the generation efficiency of photon pairs via the enhancement of material nonlinearity is important for various applications including a near-on-demand single photon source based on multiplexed photon pair sources [1]. In this regard, photonic crystal nanocavities are attractive nonlinear...
Short distance optical communication is required to reduce power consumption of ICT systems and continuously improve performance of datacentres and HPCs [1]. Reduced energy consumption and increased bandwidth density [2-3] are required to develop optical interconnects between chips and on chips. Therefore, lasers and detectors with ultra-low operating energy have to be connected by Si nanowire waveguides...
Spontaneous emission of PbS quantum dots (QDs) in different photonic nanostructures has been studied. We use the temperature-dependent exciton photoluminescence and the classic dipole near interface models to understand the spontaneous emission control at various temperatures. Then, we demonstrate that the enhancement and the inhibition of PbS QDs due to the local density of states (LDOS) inside nanostructures...
Straight and curved waveguides in 2D photonic crystals with wide transmission bands were realized using coupled high-Q L2 nanocavities. A channel drop filter was created by combining two coupled curved nanocavities and an H0 nanocavity.
Performance of slow-light coupled-resonator optical waveguides (CROW) in a photonic crystal was analysed, and found to be limited by disorder-induced localisation. Localised modes were directly measured through out-of-plane loss.
A photonic-crystal photodetector having a <1-fF junction capacitance, 1-A/W responsivity, and 40-Gbit/s eye opening was demonstrated. Its resistor-loaded configuration unveiled a light-to-voltage conversion with a kV/W efficiency without amplifiers, promising for an fJ/bit-energy on-chip receiver.
We present a fabrication method for a photonic crystal membrane consisting of Er2O3/Si, and investigate the induced photonic band-gap effect. We obtain a fine photonic crystal structure by selective area growth of Er2O3 on a pre-patterned Si(111) membrane by the molecular beam epitaxy method, and the fabricated Er2O3/Si photonic crystals show the suppression of the radiative transition as a result...
Ultrasmall photonic-crystal photodetector-modulator integration provides a highly efficient alloptical functionality for high-bit-rate optical signals thanks to the high RC bandwidth. Wavelength conversion for 10-Gb/s optical signals was confirmed in a simulation and a preliminary experiment.
Enhanced coupling in slanted L3 nanocavity array expanded bandwidth to 4 THz at telecom wavelength. High-Q tuned L3 nanocavity realized 1,000 coupled cavities with acceptable propagation loss and delay-bandwidth product over 100.
Systematic multi-hole tuning of H0 nanocavity with theoretical Q of ∼107 is reported that outperforms L3 and other a-few-missing-hole nanocavities over a wide slab-thickness range. Experimental Q of ∼106 is achieved.
We achieved three-dimensional mode conversion between a Si-wire waveguide and a deep sub-λ plasmonic slot waveguide (60 χ 50 nm2) for the first time. The coupling loss was only about 2 dB.
Ultrasmall InGaAsP optical modulators were realized using a photonic crystal waveguide/nanocavity with a small-capacitance p-i-n junction and the Franz-Keldysh effect. Eye patterns reaching 56 Gb/s and a record-low charging energy of <100 aJ/bit were evaluated.
1.7-μm-long InGaAs photonic crystal photodetectors connected to a load resistor were demonstrated towards realizing ultralow-power photoreceivers without electrical amplifiers. A high light-to-voltage conversion efficiency of 4 kV/W was confirmed with electro-optic probing technique.
We evaluated high-speed behaviour of electrically driven photonic crystal lasers by direct modulations and found that they had 17.8-GHz 3-dB bandwidth. A 25-Gbit/s eye diagram was also demonstrated with a bias current as low as 150 μA.
The on-chip integration of all-optical switches and random-access memories based on a photonic crystal (PhC) nanocavity having a carrier-induced optical nonlinearity are presented. 25-channel all-optical gate switching and the wavelength-division multiplexing operation by silicon PhC nanocavity arrays were demonstrated with a femto-joule energy level. For the all-optical memory, an InP-based PhC nanocavity...
This article reviews our recent studies of ultralow-power nanophotonics devices toward implementing a dense optical communication network in a processor chip. A photonic crystal nanocavity that has a very large Q/V is a very promising tool for reducing the energy consumption and footprint related to this goal. We demonstrate that, to fully exploit this merit, it is essential to introduce appropriate...
We developed a method for calculating the Q-factor of a 2D photonic crystal nanocavity directly from the in-plane wavevector distribution of the cavity mode. A high-Q of >107 was obtained with high accuracy and speed.
We demonstrate the first continuous wave operation of electrically driven photonic-crystal lasers on Si at room temperature. Plasma assisted bonding integrated III–V semiconductor devices on Si. The device exhibited a 33 µA threshold current.
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