Hybrid grating reflectors: Origin of ultrabroad stopband | Zendy

Gyeong Cheol Park | Zendy; Alireza Taghizadeh | Zendy; IlSug Chung | Zendy

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Hybrid grating reflectors: Origin of ultrabroad stopband

Author(s) -

Gyeong Cheol Park,

Alireza Taghizadeh,

IlSug Chung

Publication year - 2016

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4945737

Subject(s) - stopband , grating , materials science , optoelectronics , optics , guided mode resonance , resonance (particle physics) , refractive index , photonics , laser , diffraction grating , layer (electronics) , wafer , fabry–pérot interferometer , silicon , wavelength , nanotechnology , physics , particle physics , resonator

Hybrid grating (HG) reflectors with a high-refractive-index cap layer added onto a high contrast grating (HCG) provide a high reflectance close to 100% over a broader wavelength range than HCGs. The combination of a cap layer and a grating layer brings a strong Fabry-Perot (FP) resonance as well as a weak guided mode (GM) resonance. Most of the reflected power results from the FP resonance, while the GM resonance plays a key role in achieving a reflectance close to 100% as well as broadening the stopband. An HG sample with 7 InGaAlAs quantum wells included in the cap layer has been fabricated by directly wafer-bonding a III-V cap layer onto a Si grating layer. Its reflection property has been characterized. This heterogeneously integrated HG reflector may allow for a hybrid III-V on Si laser to be thermally efficient, which has promising prospects for silicon photonics light sources and high-speed operation.

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