Abstract
We report a novel high-quality (Q) factor optical resonator using a subwavelength high-contrast grating (HCG) with in-plane resonance and surface-normal emission. We show that the in-plane resonance is manifested is by a sharp, asymmetric lineshape in the surface-normal reflectivity spectrum. The simulated Q factor of the resonator is shown to be as high as 500,000. A HCG-resonator was fabricated with an InGaAs quantum well active region sandwiched in-between AlGaAs layers and a Q factor of >14,000 was inferred from the photoluminescence linewidth of 0.07 nm, which is currently limited by instrumentation. The novel HCG resonator design will serve as a potential platform for many devices including surface emitting lasers, optical filters, and biological or chemical sensors.
Highlights
High-quality (Q) factor optical resonators have attracted much attention with various applications including lasers, single photon sources, optical filters, and sensors [1,2,3,4,5,6]
We present a design with the Q factor as high as 500,000 using the finite difference-time-domain (FDTD) numerical simulation
The device was grown by metal organic chemical vapor deposition (MOCVD) on a GaAs substrate
Summary
High-quality (Q) factor optical resonators have attracted much attention with various applications including lasers, single photon sources, optical filters, and sensors [1,2,3,4,5,6]. A high-Q resonator with surface-normal emission is of great interest in many applications such as lasers, optical filters and sensors. It has been shown that gratings with a subwavelength modulation in refractive index can function as filters due to the guided-mode resonance [12]. This resonance has been successfully exploited in the development of some sensor applications [13,14]. We further demonstrated tunable VCSELs with a HCG as a movable reflector [18]
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