摘要:
A frequency tunable terahertz continuous wave generator controls the number of feedbacks of an optical signal output from an optical intensity modulator by adding a feedback loop between input and output terminals of the optical intensity modulator, thereby simply tuning a frequency of a terahertz continuous wave.
摘要:
An ultra-small optical/magnetic head actuator includes: a swing arm movable in a horizontal direction (tracking direction) and a vertical direction (focusing direction) and having mounted thereon a head for reading and writing information on a disk. A tracking actuator moves the swing arm in the horizontal direction (tracking direction) and a pivot hinge adjusts a radius of rotation of the swing arm and guides the movement of the swing arm in the tracking direction. A focusing actuator moves the swing arm in the vertical direction (focusing direction), wherein the focusing actuator includes a focusing coil attached under the swing arm and a Halbach magnet array disposed under the focusing coil minimizes thickness. Friction or backlash can be avoided, and non-repetitive errors can be reduced. The thickness of the ultra-small storage device can be reduced due to the use of a Halbach magnet array.
摘要:
Provided are a terahertz wave transmission and reception (Tx/Rx) module package and method of manufacturing the same. The complete and separate terahertz wave Tx/Rx module package is implemented by simply aligning a silicon ball lens, a photoconductive antenna and a focusing lens, and thus facilitates generation or measurement of a terahertz wave. The terahertz wave Tx/Rx module package and method can remarkably reduce time and cost required to build a terahertz wave generation and measurement system, and simplify and miniaturize the terahertz wave generation and measurement system. In addition, characteristics of a terahertz wave generated by the photoconductive antenna can be simply measured. Furthermore, the terahertz wave Tx/Rx module package can be stored and transported with a photoconductive antenna, a silicon ball lens and a focusing lens kept aligned as they are, and also it is possible to minimize pollution of terahertz wave devices caused by surroundings.
摘要:
An apparatus and method for generating a terahertz (THz) wave are provided. The apparatus comprises: an fiber optic probe injecting an optical wave transmitted through an optical fiber into a device under test (DUT); a driving oscillator generating and injecting an electrical wave into the DUT; and the device under test (DUT) generating a THz wave using the produced optical and electrical waves.
摘要:
An optical head has a beam input/output coupler on a planar waveguide and other parts including: a light transmitting element emitting a beam; a planar waveguide formed on a substrate and receiving the beam oscillated from the light transmitting element; a beam input/output coupler integrated as a thin film on a portion of the planar waveguide and receiving the beam through the planar waveguide to transmit the beam vertically toward a disc positioned above the planar waveguide or transmitting the beam reflected from the disc through the planar waveguide; and light receiving elements receiving the beam propagated to the planar waveguide through the beam input/output coupler.
摘要:
Provided is an optical disk drive adapter comprising: a first rotating portion disposed at the center of an optical disk drive and installing a turntable on which a standard optical disk is mounted; a second rotating portion disposed beside the first rotating portion and installing a turntable on which a subminiature optical disk is mounted; a force transmitting portion disposed between the first rotating portion and the second rotating portion and transmitting a rotary force between the first rotating portion and the second rotating portion; and a housing supporting the entire optical disk drive adapter so that the first rotating portion, the second rotating portion, and the force transmitting portions can be rotated on their axes while maintaining their overall shape. Accordingly, without an additional subminiature optical disk drive, a subminiature optical disk can be driven using a conventional standard optical disk drive.
摘要:
There is provided a packaging apparatus of a terahertz device, the apparatus including: a terahertz device having an active region at which terahertz wave is radiated or detected; a device substrate mounting the terahertz device whose active region is positioned at an opening region formed at the center of the device substrate, and electrically connecting the terahertz device and an external terminal to each other; a ball lens block arranged and fixed to an upper part of the terahertz device; and upper and lower cases receiving the device substrate mounted with the terahertz device therein and opening region vertical upper and lower portions of the active region of the terahertz device.
摘要:
There is provided a packaging apparatus of a terahertz device, the apparatus including: a terahertz device having an active region at which terahertz wave is radiated or detected; a device substrate mounting the terahertz device whose active region is positioned at an opening region formed at the center of the device substrate, and electrically connecting the terahertz device and an external terminal to each other; a ball lens block arranged and fixed to an upper part of the terahertz device; and upper and lower cases receiving the device substrate mounted with the terahertz device therein and opening region vertical upper and lower portions of the active region of the terahertz device.
摘要:
An apparatus and method for generating a terahertz (THz) wave are provided. The apparatus comprises: an fiber optic probe injecting an optical wave transmitted through an optical fiber into a device under test (DUT); a driving oscillator generating and injecting an electrical wave into the DUT; and the device under test (DUT) generating a THz wave using the produced optical and electrical waves.
摘要:
Provided are a hub for chucking an optical disk to a disk table of a recording/reproducing apparatus using a magnetic attraction force, and a small form factor optical disk for information storage including the hub. The hub is made of a magnetic metal-polymer composite material. The optical disk includes: a disk plate having a central through-hole and a recess, lower than an edge, formed around the through-hole; and a hub made of a magnetic metal-polymer composite material and inserted into the through-hole to be coupled to the disk plate.