Infrared‐to‐THz Detection and Spectroscopy with Whispering‐Gallery‐Mode Microresonators

نویسندگان

چکیده

A novel room‐temperature photodetector based on a silica‐microsphere optical resonator operating from the mid‐infrared to terahertz spectral region is reported. The sensor relies free‐space visible laser whose frequency locked center of whispering‐gallery mode (WGM). devised scheme automatically tracks any small change in microresonator's size and refractive index that occurs upon illumination with radiation absorbed by silica. In this way, direct detection quantum‐cascade beams around 4.3 111 μm wavelengths shown, down minimum noise‐equivalent power levels ≈1 pW √Hz −1 dynamic range >100 dB. microsphere then exploited, for first time, as absorption spectroscopy 12 CO 2 fundamental ro‐vibrational band very‐weak 13 CH 3 OH rotational lines.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Cavity ring-up spectroscopy for ultrafast sensing with optical microresonators

Spectroscopy of whispering-gallery mode microresonators has become a powerful scientific tool, enabling the detection of single viruses, nanoparticles and even single molecules. Yet the demonstrated timescale of these schemes has been limited so far to milliseconds or more. Here we introduce a scheme that is orders of magnitude faster, capable of capturing complete spectral snapshots at nanosec...

متن کامل