We will present our recent work on achieving a high-quality factor (Q) in microresonators operating in the longwave infrared (LWIR) range of 8 to 14 microns.1 Advances in this area have the potential to drive new developments in integrated non-linear optics and chip-based sensing, due to the availability of powerful integrated light sources such as solid-state quantum cascade lasers and strong demand for sensing applications in the LWIR atmospheric transparency window. However, until recently limitations in low-loss materials and fabrication processes have resulted in Q factors that are only several thousand. We will discuss the use of germanium as a high-quality material and heterogeneous fabrication process that produces ultra-smooth surfaces. By coupling the output of a QCL into a partially suspended Ge-on-glass waveguide, we were able to achieve an intrinsic Q of 2.5 ×105. Our results demonstrate the importance and potential of using high-quality native materials for integrated photonics in the LWIR range and portends new sensor topologies.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.