The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 07, 2023
Filed:
Aug. 20, 2021
The Government of the United States of America, As Represented BY the Secretary of the Navy, Arlington, VA (US);
Jerry R. Meyer, Catonsville, MD (US);
Igor Vurgaftman, Severna Park, MD (US);
Chadwick Lawrence Canedy, Washington, DC (US);
William W. Bewley, Falls Church, VA (US);
Chul Soo Kim, Springfield, VA (US);
Charles D. Merritt, Fairfax, VA (US);
Michael V. Warren, Arlington, VA (US);
R. Joseph Weiblen, Washington, DC (US);
Mijin Kim, Springfield, VA (US);
Abstract
Building blocks are provided for on-chip chemical sensors and other highly-compact photonic integrated circuits combining interband or quantum cascade lasers and detectors with passive waveguides and other components integrated on a III-V or silicon. A MWIR or LWIR laser source is evanescently coupled into a passive extended or resonant-cavity waveguide that provides evanescent coupling to a sample gas (or liquid) for spectroscopic chemical sensing. In the case of an ICL, the uppermost layer of this passive waveguide has a relatively high index of refraction that enables it to form the core of the waveguide, while the ambient air, consisting of the sample gas, functions as the top cladding layer. A fraction of the propagating light beam is absorbed by the sample gas if it contains a chemical species having a fingerprint absorption feature within the spectral linewidth of the laser emission.