Monolithic integration of an AlGaAs/GaAs multiple quantum well distributed feedback laser and a grating coupler for surface emission

Noda, Susumu; Kojima, K.; Mitsunaga, K.; Kyuma, Kazuo; Hamanaka, Koich; Nakayama, Takashi

doi:10.1063/1.98732

Cited by 13 publications

(3 citation statements)

References 15 publications

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“…The difference between the measured and theoretical values is considered to be due to the fact that ͑1͒ the fabricated device has a ringlike beam spot, and ͑2͒ the beam does not have a Gaussian beam profile, rather, the beam profile decreases exponentially in a similar manner to conventional 1D grating-coupled surface-emitting lasers. 9 FIG. 4.…”

Section: Measurements Of Lasing Characteristics and Comparison Wmentioning

confidence: 99%

“…This is the same phenomenon that occurs in conventional grating-coupled surface-emitting lasers, and facilitates the extraction of light from the device. 9 There are many other points at frequencies higher than point III where waves are multidirectionally coupled in plane and out of plane. However, the angles of out-of-plane coupling by Bragg diffraction either vary from 90°entirely or have a component that varies from 90°, i.e., light is also coupled out of plane at an angle other than 90°.…”

Section: Introductionmentioning

confidence: 99%

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Multidirectionally distributed feedback photonic crystal lasers

et al. 2002

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The lasing mode of a two-dimensional ͑2D͒ photonic crystal laser with in-plane multidirectionally distributed feedback effect is analyzed theoretically and experimentally. From an investigation of the Bragg diffraction conditions at several points in the photonic band diagram where lasing is expected, we identify a particular ⌫ point at which lasing occurs due to the coupling of lightwaves propagating in six equivalent ⌫-X directions and diffraction normal to the substrate surface. In order to investigate the lasing mode in detail, the distribution of the electromagnetic field at the band edges at the ⌫ point is calculated, and each band edge is found to have a different field pattern. The lasing characteristics of the 2D photonic crystal laser at the lasing wavelength corresponding to the ⌫ point are measured. Single-mode lasing over a broad circular area is observed by microelectroluminescence measurements under pulsed conditions at room temperature. We also demonstrate the correspondence between the measured lasing wavelengths and calculated band edges by comparing the polarization characteristics with the calculated distribution of the electromagnetic field. The results indicate that 2D coherent lasing oscillation does, in fact, occur due to the multidirectional coupling effect in the 2D photonic crystal. From the theoretical calculation, we show that the polarization patterns of the lasers can be controlled by introducing artificial lattice defects.

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Section: Measurements Of Lasing Characteristics and Comparison Wmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multidirectionally distributed feedback photonic crystal lasers

et al. 2002

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“…This is the best choice because it includes the coupling within the plane in six directions (0°, ± 60, ± 120° and 180°) inside the plane. Furthermore the direction of the resultant vector of coupling is perpendicular to the plane of the photonic crystal according to the first order Bragg diffraction [23,28]. In our device this effect is used for the recovery of light emitted in the six directions of the plane formed by the photonic crystal.…”

Section: Photonic Crystal Design For Enhanced Detection Of Fluorescencementioning

confidence: 99%

Optofluidic chips with nanochannels for dynamic molecular detection using enhanced fluorescence

Postigo¹,

Álvaro²,

Juarros³

et al. 2016

Biomed. Opt. Express

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Abstract:The fabrication of a novel optofluidic chip using nanochannels optimized for DNA-stretched molecules and optical detection by enhanced fluorescence is reported. The chips are composed of a series of microchannels that allow the transport of molecules in the femto-liter per second inside a fluid or gas. The nanochannels are surrounded by a photonic crystal structure to enhance the emission of fluorescent light from the molecules, which can travel along the nanochannel, allowing for enhanced optical detection of the molecules in motion. The photonic crystal structure provides an enhancement up to 2.5 times in the light emitted from fluorescent molecules inside the nanochannels which increases to around 250 when normalized to the area of the nanochannels emitting fluorescence. The results may help to the detection of fluorescent molecules (like marked-DNA) in series by speeding it and allowing the use of less sophisticated equipment. Vandebriel, "Systemic and immunotoxicity of silver nanoparticles in an intravenous 28 days repeated dose toxicity study in rats," Biomaterials 34(33), 8333-8343 (2013).

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