Abstract: There is provided a imaging device including: an N-type region formed for each pixel and configured to perform photoelectric conversion; an inter-pixel light-shielding wall penetrating a semiconductor substrate in a depth direction and formed between N-type regions configured to perform the photoelectric conversion, the N-type regions each being formed for each of pixels adjacent to each other; a P-type layer formed between the N-type region configured to perform the photoelectric conversion and the inter-pixel light-shielding wall; and a P-type region adjacent to the P-type layer and formed between the N-type region and an interface on a side of a light incident surface of the semiconductor substrate.

Abstract: A multi-beam semiconductor laser device capable of emitting respective laser beams with uniform optical output levels and enabling easy alignment is provided. This multi-beam semiconductor laser device (40) is a GaN base multi-beam semiconductor laser device provided with four laser stripes (42A, 42B, 42C and 42D) which are capable of emitting laser beams with the same wavelength. The respective laser oscillating regions (42A to 42D) are provided with a p-type common electrode (48) on a mesa structure (46) which is formed on a sapphire substrate (44), and have active regions (50A, 50B, 50C and 50D) respectively. Two n-type electrodes (52A and 52B) are provided on an n-type GaN contact layer (54) and located as common electrodes opposite to the p-type common electrode (48) on both sides of the mesa structure (46). The distance A between the laser stripe (42A) and the laser stripe (42D) is no larger than 100 ?m.

Abstract: In a multi-beam semiconductor laser including nitride III–V compound semiconductor layers stacked on one surface of a substrate of sapphire or other material to form laser structures, and including a plurality of anode electrodes and a plurality of cathode electrodes formed on the nitride III–V compound semiconductor layers, one of the anode electrodes is formed to bridge over one of the cathode electrodes via an insulating film, and another anode electrode is formed to bridge over another of the cathode electrodes via an insulating film.

Abstract: A method of fabricating a nitride semiconductor includes the steps of forming a nitride semiconductor doped with a p-type impurity, treating the surface of the nitride semiconductor in an atmosphere containing active oxygen to remove carbon remaining on the surface and form an oxide film thereon, and activating the p-type impurity to turn the conductive type of the nitride semiconductor into a p-type. Since carbon remaining on the surface of the nitride semiconductor is removed and the oxide film is formed thereon, the surface of the nitride semiconductor is prevented from being deteriorated by the activating treatment and the rate of activating the p-type impurity is enhanced. As a result, it is possible to reduce the contact resistance of the nitride semiconductor with an electrode and, hence, the variation in characteristics of the nitride semiconductor.

Abstract: A multi-beam semiconductor laser device capable of emitting respective laser beams with uniform optical output levels and enabling easy alignment is provided. This multi-beam semiconductor laser device (40) is a GaN base multi-beam semiconductor laser device provided with four laser stripes (42A, 42B, 42C and 42D) which are capable of emitting laser beams with the same wavelength. The respective laser oscillating regions (42A to 42D) are provided with a p-type common electrode (48) on a mesa structure (46) which is formed on a sapphire substrate (44), and have active regions (50A, 50B, 50C and 50D) respectively. Two n-type electrodes (52A and 52B) are provided on an n-type GaN contact layer (54) and located as common electrodes opposite to the p-type common electrode (48) on both sides of the mesa structure (46). The distance A between the laser stripe (42A) and the laser stripe (42D) is no larger than 100 ?m.

Abstract: A multi-beam semiconductor laser device capable of emitting respective laser beams with uniform optical output levels and enabling easy alignment is provided. This multi-beam semiconductor laser device (40) is a GaN base multi-beam semiconductor laser device provided with four laser stripes (42A, 42B, 42C and 42D) which are capable of emitting laser beams with the same wavelength. The respective laser oscillating regions (42A to 42D) are provided with a p-type common electrode (48) on a mesa structure (46) which is formed on a sapphire substrate (44), and have active regions (50A, 50B, 50C and 50D) respectively. Two n-type electrodes (52A and 52B) are provided on an n-type GaN contact layer (54) and located as common electrodes opposite to the p-type common electrode (48) on both sides of the mesa structure (46). The distance A between the laser stripe (42A) and the laser stripe (42D) is no larger than 100 ?m.

Abstract: The nitride-based semiconductor laser device 10 has a stacked structure comprising a first contacting layer 14, a first cladding layer 16, an active layer 20, a second cladding layer 24, a second contacting layer 26 and a second electrode 30 which are consecutively stacked, the second cladding layer 24 comprises a lower layer 24A and an upper layer 24B, the first cladding layer 14, the active layer 20 and the lower layer 24A of the second cladding layer have a mesa structure, the upper layer 24B of the second cladding layer and the second contacting layer 26 have a ridge structure, an insulating layer 40 covering at least part of each of both side surfaces of the upper layer 24B of the second cladding layer is formed on the portions of the lower layer 24A of the second cladding layer which portions correspond to the top surface of the mesa structure, and further, a metal layer 42 having substantially the same width as the mesa structure is formed on the top surface of the insulating layer 40 and the top surfa

Abstract: In a multi-beam semiconductor laser including nitride III-V compound semiconductor layers stacked on one surface of a substrate of sapphire or other material to form laser structures, and including a plurality of anode electrodes and a plurality of cathode electrodes formed on the nitride III-V compound semiconductor layers, one of the anode electrodes is formed to bridge over one of the cathode electrodes via an insulating film, and another anode electrode is formed to bridge over another of the cathode electrodes via an insulating film.

Abstract: A multi-beam semiconductor laser device capable of emitting respective laser beams with uniform optical output levels and enabling easy alignment is provided. This multi-beam semiconductor laser device (40) is a GaN base multi-beam semiconductor laser device provided with four laser stripes (42A, 42B, 42C and 42D) which are capable of emitting laser beams with the same wavelength. The respective laser oscillating regions (42A to 42D) are provided with a p-type common electrode (48) on a mesa structure (46) which is formed on a sapphire substrate (44), and have active regions (50A, 50B, 50C and 50D) respectively. Two n-type electrodes (52A and 52B) are provided on an n-type GaN contact layer (54) and located as common electrodes opposite to the p-type common electrode (48) on both sides of the mesa structure (46). The distance A between the laser stripe (42A) and the laser stripe (42D) is no larger than 100 &mgr;m.

Abstract: The nitride-based semiconductor laser device 10 has a stacked structure comprising a first contacting layer 14, a first cladding layer 16, an active layer 20, a second cladding layer 24, a second contacting layer 26 and a second electrode 30 which are consecutively stacked, the second cladding layer 24 comprises a lower layer 24A and an upper layer 24B, the first cladding layer 14, the active layer 20 and the lower layer 24A of the second cladding layer have a mesa structure, the upper layer 24B of the second cladding layer and the second contacting layer 26 have a ridge structure, an insulating layer 40 covering at least part of each of both side surfaces of the upper layer 24B of the second cladding layer is formed on the portions of the lower layer 24A of the second cladding layer which portions correspond to the top surface of the mesa structure, and further, a metal layer 42 having substantially the same width as the mesa structure is formed on the top surface of the insulating layer 40 and the top surfa

Abstract: The nitride-based semiconductor laser device 10 has a stacked structure comprising a first contacting layer 14, a first cladding layer 16, an active layer 20, a second cladding layer 24, a second contacting layer 26 and a second electrode 30 which are consecutively stacked, the second cladding layer 24 comprises a lower layer 24A and an upper layer 24B, the first cladding layer 14, the active layer 20 and the lower layer 24A of the second cladding layer have a mesa structure, the upper layer 24B of the second cladding layer and the second contacting layer 26 have a ridge structure, an insulating layer 40 covering at least part of each of both side surfaces of the upper layer 24B of the second cladding layer is formed on the portions of the lower layer 24A of the second cladding layer which portions correspond to the top surface of the mesa structure, and further, a metal layer 42 having substantially the same width as the mesa structure is formed on the top surface of the insulating layer 40 and the top surfa

Abstract: The nitride-based semiconductor laser device 10 has a stacked structure comprising a first contacting layer 14, a first cladding layer 16, an active layer 20, a second cladding layer 24, a second contacting layer 26 and a second electrode 30 which are consecutively stacked, the second cladding layer 24 comprises a lower layer 24A and an upper layer 24B, the first cladding layer 14, the active layer 20 and the lower layer 24A of the second cladding layer have a mesa structure, the upper layer 24B of the second cladding layer and the second contacting layer 26 have a ridge structure, an insulating layer 40 covering at least part of each of both side surfaces of the upper layer 24B of the second cladding layer is formed on the portions of the lower layer 24A of the second cladding layer which portions correspond to the top surface of the mesa structure, and further, a metal layer 42 having substantially the same width as the mesa structure is formed on the top surface of the insulating layer 40 and the top surfa

Abstract: A method of fabricating a nitride semiconductor includes the steps of forming a nitride semiconductor doped with a p-type impurity, treating the surface of the nitride semiconductor in an atmosphere containing active oxygen to remove carbon remaining the surface and form an oxide film thereon, and activating the p-type impurity to turn the conductive type of the nitride semiconductor into a p-type. Since carbon remaining on the surface of the nitride semiconductor is removed and the oxide film is formed thereon, the surface of the nitride semiconductor is prevented from being deteriorated by the activating treatment and the rate of activating the p-type impurity is enhanced. As a result, it is possible to reduce the contact resistance of the nitride semiconductor with an electrode and hence to variation in characteristics of the nitride semiconductor.