The effect of mode spacing on the speed of quantum-well microcavity lasers

Wu, C. H.; Tan, F.; Feng, M.; Holonyak, N.

doi:doi:10.1063/1.3485048

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Surface plasmon enhanced responsivity in a waveguided germanium metal-semiconductor-metal photodetector

The authors report on high transverse magnetic (TM)-mode responsivity in a waveguided germanium Schottky-barrier metal-semiconductor-metal photodetector on silicon-on-insulator substrate for operating wavelength at 1550 nm. The employed aluminum interdigitated electrodes act as a one-dimensional rectangular grating above the depletion layer. By means of properly designed finger dimensions, surface plasmon polariton resonances can be excited at the interface of metal and silicon interfacial laye...

Light-hole and heavy-hole transitions for high-temperature long-wavelength infrared detection

Hole transitions from the heavy-hole (hh) to the light-hole (lh) band contributing to the 4–10 μm response range are reported on p-GaAs/AlGaAs detectors. The detectors show a spectral response up to 16.5 μm, operating up to a temperature of 330 K where the lh-hh response is superimposed on the free-carrier response. Two characteristic peaks observed between 5–7 μm are in good agreement with corresponding energy separations of the lh and hh bands and thus originated from lh-hh transitions. Resul...

Oxide-confined quantum-well microcavity vertical-cavity surface-emitting lasers (VCSELs) of three-diameters (aperture size d_A ∼ 2, 2.5, and 3.5 μm) have been fabricated that operate as nearly single-mode lasers at ultralow thresholds I_TH = 0.15, 0.16, and 0.20 mA. Relative spectral intensities are measured at a set higher bias current I = 0.8 mA for the three VCSEL sizes to determine the dependence on mode spacing between the fundamental and second order modes, which at increasing diameter are Δλ ∼ 2.2, 1.6, and 1.0 nm. By studying the side-mode suppression ratio and the optical microwave frequency response of the microcavity VCSELs throughout a spread-out group of modes, we are able to resolve the dependence of signal amplitude and time response on the difference in mode spacing, Δλ, higher speed response occurring at larger Δλ.

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KEYWORDS and PACS

Keywords

frequency response, laser cavity resonators, laser modes, quantum well lasers, surface emitting lasers

PACS

42.55.Px

Semiconductor lasers; laser diodes
42.60.Da

Resonators, cavities, amplifiers, arrays, and rings

ARTICLE DATA

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http://dx.doi.org/10.1063/1.3485048

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0003-6951 (print)

1077-3118 (online)

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$abstract.society.value is a Member of CrossRef

American Institute of Physics

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