Terahertz-wave device and terahetz-wave integrated circuits

Patent metadata

Field	Value
Publication number	US-9632247-B2
Application number	US-201514644175-A
Country	US
Kind code	B2
Filing date	Mar 10, 2015
Priority date	Mar 12, 2014
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

The THz-wave device comprises: a 2D-PC slab; lattice points periodically arranged in the 2D-PC slab, the lattice points for diffracting the THz waves in PBG frequencies of photonic band structure of the 2D-PC slab in order to prohibit existence in a plane of the 2D-PC; a 2D-PC waveguide disposed in the 2D-PC slab and formed with a line defect of the lattice points; and an RTD device disposed on the 2D-PC waveguide.

First claim

What is claimed is:

1. A terahertz-wave device comprising:
a two dimensional photonic crystal slab;
lattice points periodically arranged in the two dimensional photonic crystal slab, the lattice points configured to diffract terahertz waves in photonic bandgap frequencies in photonic band structure of the two dimensional photonic crystal slab in order to prevent the terahertz waves from existing in a plane of the two dimensional photonic crystal slab;
a two dimensional photonic crystal waveguide disposed in the two dimensional photonic crystal slab, the two dimensional photonic crystal waveguide formed of a line defect of the lattice points; and
a diode device disposed in a trench formed in the two dimensional photonic crystal waveguide so that a top surface of the diode device is formed at a height equal to or lower than a height of a surface of the two dimensional photonic crystal waveguide.

2. The terahertz-wave device according to claim 1 , wherein
the diode device is disposed in the trench formed in the two dimensional photonic crystal waveguide so that a surface of the diode device is matched with a cross-sectional center portion vertical to the surface of the two dimensional photonic crystal slab of the two dimensional photonic crystal waveguide.

3. The terahertz-wave device according to claim 1 , wherein
the diode device comprises a resonance tunnel diode device.

4. The terahertz-wave device according to claim 3 , wherein
the resonance tunnel diode device comprises: a semiconductor substrate;
a first electrode and second electrode disposed on the semiconductor substrate; and
a resonant tunneling diode disposed on the semiconductor substrate, and a main electrode of the resonant tunneling diode connected to the first electrode and the second electrode.

5. The terahertz-wave device according to claim 4 , wherein
the resonance tunnel diode device comprises an antenna selected from the group consisting of a dipole antenna, a patch antenna, and a slot antenna, and the selected antenna is integrated into the resonant tunneling diode.

6. The terahertz-wave device according to claim 4 , wherein
a height of a center portion of the two dimensional photonic crystal waveguide is matched with a height of the first electrode or the second electrode.

7. The terahertz-wave device according to claim 1 , wherein
the diode device is disposed in a trench formed in the two dimensional photonic crystal waveguide so that the top surface of the diode device is flush with the surface of the two dimensional photonic crystal waveguide.

Assignees

• Rohm Co Ltd
• Univ Osaka

Inventors

• Fujita Masayuki
• Nagatsuma Tadao
• Tsuruda Kazuisao
• Onishi Dai

Classifications

• G02B6/34

  utilising prism or grating {(G02B6/293 takes precedence)} · CPC title

• G02B2006/12121

  Laser · CPC title

• H01S2302/02

  THz - lasers, i.e. lasers with emission in the wavelength range of typically 0.1 mm to 1 mm · CPC title

• G02B6/1225 Primary

  comprising photonic band-gap structures or photonic lattices · CPC title

• G02B2006/12126

  Light absorber · CPC title