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We have demonstrated an efficient laser ignition for internal combustion engine by using plug size giant-pulse microchip ceramic lasers. The progress of giant micro-photonics produced those multi mega-watt high-brightness compact lasers in pulse-gap region.
Millimeter scale scanning MEMS mirror with sub-wavelength microhole arrays has been successfully demonstrated for terahertz wave scanning. Sub-wavelength microhole arrays provide both high reflectivity at THz waves and low air damping during the mirror scanning.
Site-controlled single photon emitters with emission wavelengths matched to the peak efficiency of silicon single photon detectors were demonstrated using lithographically defined InGaN/GaN quantum dots. A drastic strain-relaxation-induced enhancement of radiative efficiency was observed.
We have fabricated coplanar liquid lens having dielectric layer with thickness gradient, which was realized using reflow process of photoresist, demonstrating that the off-centering error was 20um that is considerably smaller than geometrical centering.
We propose a simple and efficient off-chip coupler for vertical coupling between optical fibers and InP-based slab waveguides. Etching angle of the waveguide edge is controlled by an etching jig made of SiO2-coated aluminum for ICP-RIE. Simulation shows that maximum 71% coupling efficiency would be obtained by matrix expansion methods.
Optical nanostructures have the potential to provide useful new functionalities, using materials and fabrication methods that are compatible with standard silicon-based processes. For example, it has been shown that a nanoscale grating coated with a metal layer produces polarization-selective reflectivity [1,2], based on the combined effects of form birefringence and a resonant cavity [3]. In this...
This paper reports on chip-level optoelectronics embedded into a flexible foil. Furthermore, we present a biomedical application capable of measuring the expansion of a blood vessel and prove its functionality in an artificial circulatory system.
A gradient-index solid immersion lens is fabricated to approximate a distribution of refractive index matching derived from transformation optics. The simulation result has shown reduction of the ghost image and increase of the magnifying area.
We have been developing our original MEMS-based X-ray optics for future astronomical missions. To date, we verified the focusing of optical light and X-ray for the first time. The concept and recent advances are reviewed.
The tunable LED-based illumination system using dielectric liquid lens with changing light distribution from side emitting to focusing. LED and liquid lens set in one package filling with oil reducing the junction temperature.
Optical techniques are widely used for trapping of particles. One such technique involves the use of passive diffractive optical elements. Recently, a novel passive diffractive optical element, a spiral phase Fresnel zone plate (FZP) was proposed [1]. In this paper, we present an improved version, of the earlier reported element, that will allow for a compact optical configuration for generation of...
Infra-red absorption spectrum is measured for obtaining the molecular information. The device has the crossing of the supercontinuum light path and the liquid trench. When the water is introduced in the liquid channel between the optical fiber, the characteristic absorption peaks are confirmed.
We report on a flexible liquid microlens actuated by electrowetting mechanism. The microlens structure is made of soft polymer and its substrate is made much thinner than the lens to reduce the stress on the lens when it is stretched on a curved surface. A low-temperature fabrication process is developed to reduce the stress in the polymer. The focal length f can be varied between −14 mm and 33 mm...
We present wafer-scale processed optomechanical oscillators with low threshold power (<120μW) owing to high Qoptical = 5.3M, with phase noise of −110dBc/Hz (10kHz offset, 18.6MHz carrier). Phase noise is modeled, and measured vs. Qoptical and Qmechanical.
This work presents tailored index in terahertz broadband frequency by a subwavelength silicon honeycomb structures. The structure is fabricated by deep reactive ion etching process and their indices are tailored depending on size of structures.
We confirmed that an optical frequency-modulated signal can be transmitted through surface plasmon polaritons (SPPs) in a sample consisting of a gold film with a light/SPP coupler (coupling and decoupling gratings).
This paper presents design and simulation of an improved CMOS-MEMS electrostatic torsional micro-mirror for rotational scanning. The inclusion of substrate single crystal silicon (SCS) in vertical comb drives (VCDs) allows for large electrostatic force and scanning angle. The uniqueness of the VCDs also includes elevation tenability of the electrodes. The device design and simulation for improvements...
A conical micromirror is shown to increase the signal from fluorescent molecules within a collocated subwavelength metal aperture by 5×. Large-scale integration (75,000 miromirrors/aperture pairs) is demonstrated.
A hybrid two-axis scanning micromirror combining electrostatic and electrothermal actuators was fabricated using SOIMUMPs. Experimental evaluation shows the device is capable of scan in two orthogonal directions and produces a rectangular raster-scan pattern.
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