Abstract:
A plasmonic all-optical switch includes a graphene layer, a first dielectric layer located on the graphene layer, a nano-antenna located on the first dielectric layer, and a second dielectric layer located on the nano-antenna. An incident beam is propagated by means of a surface plasmon wave generated at an interface between the graphene layer and the first dielectric layer. Further, localized surface plasmon resonance is selectively generated at an interface between the nano-antenna and the second dielectric layer by means of a pump beam incident to the nano-antenna to decrease an intensity of the incident beam. The plasmonic all-optical switch may operate at an ultrahigh speed just with a small light energy without any electric method, greatly reduce power consumption of an IT device by applying to an all-optical transistor or the like, and increase a processing rate.
Abstract:
A photoreceptor protein-based spectrophotometer may include a field-effect transistor and a photoreceptor protein on the field-effect transistor (FET), the photoreceptor protein exhibiting change in electrical properties by absorbing light and being activated. Since the spectrophotometer can convert the light absorbed by the photoreceptor protein to an electrical signal using the FET, it can mimic human vision by using human photoreceptor proteins. The spectrophotometer can measure the color, intensity, etc. of light of broad wavelength ranges as in human vision. Thus, the spectrophotometer can be applied to the development of artificial vision, etc.
Abstract:
A gas sensor and a method of fabricating the same are provided. The gas sensor includes a substrate, carbon nanotubes (CNTs) adsorbed onto the substrate, platinum nanoparticles (NPs) decorated to surfaces of the CNTs, and an electrode formed on the substrate onto which the CNTs with the platinum NPs decorated thereto are adsorbed. When the platinum NPs and CNTs are used as a sensing material, the gas sensor can be useful in sensing gases with high sensitivity even when present at a low concentration of at least 2 ppm and stably sensing noxious gases such as C6H6, C7H8, C3H6O, CO, NO, and NH3 as well as NO2, and can have particularly excellent selectivity and response characteristics with respect to NO2 gas.
Abstract:
Disclosed are a device for detecting a single photon available at a room temperature, which includes: a signal transmitting unit including a first electrode and a second electrode spaced apart from each other and at least one nanostructure disposed between the first electrode and the second electrode, the first electrode receiving a signal from the signal generating unit; a photonic crystal lattice structure for receiving a photon, the photonic crystal lattice structure having an optical waveguide for guiding the received photon to the first electrode, the optical waveguide being formed by a plurality of dielectric structures; and a single photon detector for detecting a photon by analyzing a signal output to the second electrode, and a method for detecting a single photon using the device.
Abstract:
Disclosed are herein an apparatus and method for extreme ultraviolet (EUV) spectroscope calibration. The apparatus for EUV spectroscope calibration includes an EUV generating module, an Al filter, a diffraction grating, a CCD camera, a spectrum conversion module, and a control module that compares a wavelength value corresponding to a maximum peak among peaks of the spectrum depending on the order of the EUV light converted from the spectrum conversion module with a predetermined reference wavelength value depending on an order of high-order harmonics to calculate a difference value with the closest reference wavelength value, and controls the spectrum depending on the order of the EUV light converted from the spectrum conversion module to be moved in a direction of wavelength axis by the calculated difference value. Thus, it is possible to accurately measure a wavelength of a spectrum of EUV light used in EUV exposure technology and mask inspection technology.
Abstract:
Disclosed are an apparatus for estimating a pedestrian position based on pedestrian motion recognition, and a method therefor. The method for estimating the pedestrian position based on pedestrian motion recognition includes recognizing a specific motion of a plurality of motions of the pedestrian, performing a unique pedestrian dead-reckoning (PDR) technique corresponding to the recognized specific motion among unique PDR techniques for each of the plurality of motions of the pedestrian, and estimating the pedestrian's position by the performed unique PDR technique.
Abstract:
A method for forming a PN junction in graphene includes: forming a graphene layer, and forming a DNA molecule layer on a partial region of the graphene layer, the DNA molecule layer having a nucleotide sequence structure designed to provide the graphene layer with a predetermined doping property upon adsorption on the graphene layer. The DNA molecule has a nucleotide sequence structure designed for doping of graphene so that doped graphene has a specific semiconductor property. The DNA molecule is coated on the surface of the graphene layer of which the partial region is exposed by micro patterning, and thereby, PN junctions of various structures may be formed by a region coated with the DNA molecule and a non-coated region in the graphene layer.
Abstract:
Provided are an apparatus and method for calibrating an extreme ultraviolet (EUV) spectrometer in which a wavelength of a spectrum of EUV light used for EUV lithography and mask inspection technology can be measured accurately.
Abstract:
Provided is a pulse laser apparatus for generating laser light. The apparatus includes a first mirror and a second mirror which are disposed at both ends of a resonator and configured to reflect the laser light, a gain medium disposed between the first and second mirrors and configured to amplify and output light incident from an outside, an etalon configured to adjust a pulse width of the laser light, and an acousto-optic modulator disposed between the first and second mirrors and configured to form a mode-locked and Q-switched signal from the laser light, in which some of the laser light is output through either the first or second mirror to outside the resonator.
Abstract:
There are provided a fabricating method of a carbon nanotube-based field effect transistor having an improved binding force with a substrate and a carbon nanotube-based field effect transistor fabricated by the fabricating method. The method includes forming an oxide film on a substrate, forming a photoresist pattern on the oxide film, forming a metal film on the entire surface of the oxide film having the photoresist pattern, removing the photoresist by lifting off, adsorbing carbon nanotubes on the substrate from which the photoresist is removed, performing an annealing process to the substrate to which the carbon nanotubes are adsorbed, and removing the metal film. Since an adhesive strength between a substrate and carbon nanotubes increases, stability and reliability of a field effect transistor can be improved. If the field effect transistor is applied to a liquid sensor or the like, a lifespan of the sensor can be extended and reliability of a measurement result obtained by the sensor can be improved.