This work shows the process of computing coupling coefficients of first-order distributed feedback (DFB) metalsemiconductor
quantum-well lasers. For the gas sensing of carbon dioxide (CO2), the antimonite-based (Sb-based) DFB
lasers at the wavelength of 2 μm are discussed. The optical waveguide structure, for each laser, has a built-in grating
interface between the metal and semiconductor layers. This work considers the interface with sinusoidal corrugation
geometry for preliminary modeling and computation. To compute the coupling coefficient of the metal-grating
waveguide, a photonic method, Floquet-Bloch method (FB), is used for the waveguide with such a corrugated
semiconductor-metal interface. The optical method, the Ray-optics method (RO), is also used for computation. Both the
photonic and the optical methods have close results.
This work shows the process of computing coupling coefficients of first-order distributed feedback (DFB) metalsemiconductor
quantum-well lasers. InGaAsP/InP/Au lasers with wavelength 1550 nm for optical communications are
studied. The optical waveguide structure for such a laser has semiconductor layers and a built-in grating interface
between the metal and semiconductor layers. Such interface has sinusoidal corrugation geometry. To compute the
coupling coefficient of the metal-grating waveguide, a model is constructed by the Floquet-Bloch method (FB). The
Ray-optics method (RO) is also used to calculate the coupling coefficients. These two methods have close results.
This work shows the process of computing coupling coefficients of first-order distributed feedback (DFB) metalsemiconductor
quantum-well lasers which emit the violet light for data storage of information technology. The optical
waveguide structure for such a laser has semiconductor layers and a built-in metal grating layer. The interface between
the metal layer and its neighboring semiconductor layer has a sinusoidal corrugation functioning as the grating. To
compute the coupling coefficient of the metal-grating waveguide, a model is constructed by Floquet-Bloch formalism
(FB). Ray optics technique (RO) is also used to calculate the coupling coefficients. These two methods have close
results.
Distributed-feedback gallium-arsenide-based lasers with metal-gratings can generate stable wavelength at 980nm for
applications in dentistry. This model uses the periodic optical waveguide method to calculate the coupling coefficient,
which is a key parameter of laser performance. This model shows how the optical, geometrical, and material parameters
depending on each other and how they affect the coupling coefficients in the laser waveguides. Numerical results
compare the coupling coefficients of 980 nm lasers with those of 810 nm lasers. The modeling processes, including
results, discussions, and physical interpretations, help to design and analyze lasers for more clinical and research
applications in dentistry.
This work shows the modeling process of computing coupling coefficients of first-order distributed feedback (DFB)
metal-semiconductor quantum-well lasers. InGaAsP/InP/metal lasers with wavelength 1300 nm and
GaAs/AlGaAs/metal lasers with wavelength 850 nm are discussed and compared. The optical waveguide structure for
such a laser has semiconductor layers and a built-in metal grating layer. The interface between the metal layer and its
neighboring semiconductor layer has sinusoidal corrugation geometry. To compute the coupling coefficient of the metalgrating
waveguide, a model is constructed by Floquet-Bloch formalism (FB). Ray optics technique (RO) is also used to
calculate the coupling coefficients. These two methods have close results.
KEYWORDS: Metals, Waveguides, Semiconductor lasers, Geometrical optics, Radio over Fiber, Refractive index, Process modeling, Wave propagation, Near infrared, Dielectrics
This work demonstrates the modeling process of calculating coupling coefficients of first-order distributed feedback
(DFB) semiconductor lasers, operating on transverse electric modes in the near-infrared (NIR) spectrum range. Optical
waveguides are common structures in semiconductor lasers. The structure has dielectric layers and a metal grating layer.
The interface between the metal layer and its neighboring dielectric layer has a sinusoidal corrugated geometry.
Coupling coefficients are important parameters when analyzing laser performance. To calculate the coupling coefficient
of a shiny-metal-grating waveguide, an electromagnetic model is constructed by truncated Floquet-Bloch formalism
(TFBF). Ray optics technique is also used to calculate the coupling coefficients. These two methods have close results.
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