Rohm Co., Ltd.

Osaka University

Kyoto University

Dai Onishi

Eiji Miyai

Masayuki Fujita

Tadao Nagatsuma

Susumu Noda

Kazuisao Tsuruda

Yoshikatsu Miura

Wataru Kunishi

Takui Sakaguchi

Seita Iwahashi

Masashi Yamamoto

Daiju Takamizu

Ryoma Kakimi

Tsukasa Ishigaki

A surface emitting laser element includes a first distribution Bragg reflector (DBR) layer having a first conductivity type; a second DBR layer having a second conductivity type opposite to the first conductivity type; an active layer located between the first DBR layer and the second DBR layer; an insulating layer formed over the second DBR layer; and a surface conductive layer formed over the insulating layer. In the surface emitting laser element, a first opening, which exposes the insulating layer and overlaps with the active layer when viewed in a thickness direction of the first DBR layer, is formed in the surface conductive layer, and the first opening extends when viewed in the thickness direction.

Surface emitting laser element and optical device

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.

Terahertz-wave device and terahetz-wave integrated circuits

The photonic-crystal (PC) slab absorber includes: a two-dimensional (2D)-PC slab composed of semiconducting materials; and a lattice point periodically arranged in the 2D-PC slab, the lattice point for forming resonant-state which can capture an electromagnetic waves incident from an outside by resonating an electromagnetic wave in a band edge of a photonic band structure of the 2D-PC slab in the plane of the 2D-PC slab. The 2D-PC slab is doped with impurities and can absorb the captured electromagnetic wave in the band edge resonant frequency of the 2D-PC slab.

Photonic-crystal slab absorber and high-frequency circuit and electronic components, and transmitter, receiver and proximity wireless communication system

The 2D-PC surface emitting laser includes: a PC layer; and a lattice point for forming resonant-state arranged in the photonic crystal layer, and configured so that a light wave in a band edge in photonic band structure in the PC layer is diffracted in a plane of the PC layer, and is diffracted in a surface vertical direction of the PC layer. The perturbation for diffracting the light wave in the surface vertical direction of the PC layer is applied to the lattice point for forming resonant-state. The term 'perturbation' means that modulation is periodically applied to the lattice point for forming resonant-state. For example, the periodic modulation may be refractive index modulation, hole-diameter modulation, or hole-depth modulation.

Two dimensional photonic crystal vertical cavity surface emitting lasers

The terahertz-wave connector includes: 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 slab; a 2D-PC waveguide disposed in the 2D-PC slab and formed with a line defect of the lattice points; and an adiabatic mode converter disposed at the edge face of the 2D-PC slab to which the 2D-PC waveguide extended, the 2D-PC waveguide extended to the adiabatic mode converter. There is provided also the THz-wave IC to which such a terahertz-wave connector is applied.

Teraherz-wave connector and teraherz-wave integrated circuits, and wave guide and antenna structure

Providing a surface-emitting laser light source capable of generating a linearly polarized laser light having a single-lobed beam profile that takes the largest intensity value in its central area. A two-dimensional photonic crystal consisting of a plate member with holes arranged in a square lattice pattern is provided on one side of an active layer. The holes are designed so that its plane shape on the emission side (plane 'B') is smaller than that on the active layer side (plane 'C'). The center of gravity of the shape on plane &#x201c;B&#x201d; is displaced from that of the shape on plane &#x201c;C&#x201d; in the in-plane direction. This design lowers the degree of the in-plane symmetry of the two-dimensional photonic crystal, so that a linearly polarized laser light having a single lobe is obtained.

Growing community of inventors

Kyoto, Japan

Dai Onishi