Abstract
We design and experimentally demonstrate the propagation loss of waveguides and the operation of a single-step etched polarization rotator-splitter (PRS) in low index contrast InGaAs-InP material system at 6.15 μm. Propagation losses 4.19 dB/cm for TM mode and 3.25 dB/cm for TE mode are measured. The designed PRS can achieve near 100% conversion efficiency. This study enables the possibility of monolithic integration of quantum cascade devices with TM-polarized characteristics and TE-guiding two-dimensional slotted photonic crystal waveguide gas sensors for on-chip monolithic absorption spectroscopy.
Highlights
This study enables the possibility of monolithic integration of quantum cascade devices with transverse magnetic (TM)-polarized characteristics and transverse electric (TE)-guiding two-dimensional slotted photonic crystal waveguide gas sensors for on-chip monolithic absorption spectroscopy
By adiabatically increasing the waveguide width around w=11 μm, the power in the input TM00 mode is effectively transferred into the TE10 mode due to the mode coupling.[17]
A 90-degree phase shifter is introduced in the upper arm of the Y-splitter so that the TE00 modes are fed into the 2x2 multimode interferometer (MMI), with a total phase difference of 90 degrees
Summary
We design and experimentally demonstrate the propagation loss of waveguides and the operation of a single-step etched polarization rotator-splitter (PRS) in low index contrast InGaAs-InP material system at 6.15 μm. The third method involves monolithic integration where the passive photonics and the active quantum cascade laser/detector are fabricated on a bondingfree single epitaxially grown InP platform.
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