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Silicon photonics technology brings the volume CMOS manufacturing to optical communications in order to address clear values as speed, cost, and integration. However, the targeted data-rate levels for Telecom or Datacom applications require also high speed electronics to be closely connected to the photonics into the optical transceivers. This co-integration is key to scaling bandwidths at low costs...
Photonic bandgap fiber lasers are realizing new laser spectra and nonlinearity mitigation that a conventional fiber laser cannot by distributed spectral filtering. The recent our works will be reviewed and the future will be discussed.
Fast microscopic imaging has greatly potential applications in biology, medical science and environment monitoring. The ability to image specimen at high speed is particularly important for inspecting a large quantity in a short period of time. CCD or CMOS cameras are conventionally used for imaging, but has limited frame rate and data throughput. In this report, time-stretch high-speed microscopic...
Two-dimensional (2D) materials have emerged as attractive mediums for fabricating versatile optoelectronic devices. Recently, it has been discovered that several types of 2D materials possess both the saturable absorption effect and large nonlinear refractive index, such as graphene, topological insulator (TI), and Molybdenum Disulfide (MoS2). Taking advantage of the unique nonlinear optical properties...
Our experiments show that, besides the good tunability, resonant dispersive waves have very good frequency stabilities against to laser power and pulse duration. These results confirm the feasibility to be applied for f-to-2f measurement.
We demonstrate an all-silicon N-P-N phototransistor integrated on a silicon waveguide. The device has a high responsivity of 10 mA/W under 5 V bias at the 1550 nm telecommunication band, larger than the all-silicon P-I-N and P-N photodetectors.
We present an in vivo lung imaging of murine model for pulmonary disease by using custom-design video-rate laser-scanning confocal microscopy integrated with suction chamber for motion stabilization.
In this paper we show how new materials such as InP epitaxially grown on silicon, graphene and ferroelectric materials with strong electro-optic coefficient can be integrated with silicon waveguides and enhance the functionality of the silicon photonics platform.
Toward the practical use of on-chip optical interconnection in Si LSIs, we have set an ‘InP-based membrane photonic integrated circuit’ on a Si substrate using adhesive bonding and demonstrated low-energy digital transmission in the membrane.
We design and fabricate a space-efficient single-mode fiber (SMF) having a diameter of only 82 µm. The results show that this fiber satisfies the optical and mechanical specifications of the ITU-T G.654 recommendation. In comparison to the conventional SMF having a diameter of 125 µm, this fiber can be used to double the spatial efficiency in the space-sensitive system.
This paper reports fabrication methods for ordered metallic nanostructures such as nanowires and nanoparticles based on deoxyribonucleic acid (DNA) templates. The phosphate groups in DNA are negatively charged; consequently, the DNA conformation may mineralize metals e.g., palladium (Pd) at a relatively high metal concentration. We successfully form unique spherically shaped moss-like hybrid Pd nanoparticles...
I present a high-speed imaging technique, known as sequentially timed all-optical mapping photography (STAMP), performing burst image acquisition without the need for repetitive measurements and without sacrificing high temporal resolution and image quality. As proof-of-principle demonstrations, it was employed to obtain motion pictures of femtosecond-laser induced ablation and phonon-polariton formation...
In this paper, we focus on the maximum achievable time-bandwidth product of the photonically generated wideband microwave signals, which include the chirped and phase-coded signals and are generated based on spectrum shaping and frequency-to-time mapping.
An ytterbium-doped mode-locked fiber laser with a microfiber-based graphene saturable absorber (GSA) was proposed. By controlling cavity parameters such as pump power level and orientations of PCs, both multiple polarization locked vector solitons (PLVSs) and polarization rotation vector solitons (PRVSs) were investigated.
In this paper, recent progresses on all-optical signal processing based on semiconductor lasers under lasing conditions are reviewed, such as integrator and differentiator.
We used label-free structured illumination nanoprofilometry to study the activities of cancer-cell filopodia under various external stimulations, including concentration gradients of epidermal growth factor, electric fields, and substrate stiffness. Combined with fluorescence microscopy, we revealed some intracellular molecules that are related to these filopodial responses. We also identify a novel...
We experimentally demonstrate the use of a gold-nanorods(GNRs)/Polyvinyl-alcohol(PVA) composite-deposited side-polished fiber as an saturable absorber for a high-energy, passively Q-switched erbium fiber laser. The single pulse energy of ∼2.57 µJ was obtained from a FBG-based Fabry-Pérot cavity.
Highly-dense information in a structure can be useful to identify deformation, applied loads, or some kind of existing damages in implementation of structural health monitoring (SHM). Fiber-optic distributed strain sensors return a value of strain as a function of the linear position along an optical fiber, as they are having useful characteristics of optical fiber sensors for SHM, such as immunity...
A facile boiling emulsifier-free emulsion polymerization method was used to synthesize monodisperse polymer nanospheres whose diameters can be turned between 100 and 300 nm, and thus could self-assemble into uniform microstructures. Then, a stimuli-sensitive poly(vinyl alcohol)/poly(acrylic acid) (PVA/PAA) gelated crystalline colloidal array (GCCA) photonic crystal material was developed. The resulting...
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