Photothermal gas detection using a miniaturized fiber Fabry-Perot cavity

Krzempek, Karol; Jaworski, Piotr; Tenbrake, Lukas; Giefer, Florian; Meschede, Dieter; Hofferberth, Sebastian; Pfeifer, Hannes

doi:10.1016/j.snb.2023.135040

Cited by 7 publications

(1 citation statement)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The photothermally induced change in refractive index shifts the periodic transmission function of the etalon, which is then monitored via a change in the transmitted intensity of the probe. Recently, Krzempek et al have used miniaturized fibre-based Fabry Perot cavity sensors to retrieve the PTS signal in a proof-of-concept measurement of methane [ 12 ]. Similarly, Njegovec et al have demonstrated an all-fibre PTS gas sensor, comprising a probe fibre, a slotted capillary and an excitation fibre [ 13 ], and Yao et.…”

Section: Introductionmentioning

confidence: 99%

Micro-Ring Resonator Assisted Photothermal Spectroscopy of Water Vapor

Kotlyar,

Mapranathukaran,

Biagi

et al. 2024

Sensors

View full text Add to dashboard Cite

We demonstrated, for the first time, micro-ring resonator assisted photothermal spectroscopy measurement of a gas phase sample. The experiment used a telecoms wavelength probe laser that was coupled to a silicon nitride photonic integrated circuit using a fibre array. We excited the photothermal effect in the water vapor above the micro-ring using a 1395 nm diode laser. We measured the 1f and 2f wavelength modulation response versus excitation laser wavelength and verified the power scaling behaviour of the signal.

show abstract

Section: Introductionmentioning

confidence: 99%

Micro-Ring Resonator Assisted Photothermal Spectroscopy of Water Vapor

Kotlyar,

Mapranathukaran,

Biagi

et al. 2024

Sensors

View full text Add to dashboard Cite

show abstract

Nanoliter‐Scale Light–Matter Interaction in a Fiber‐Tip Cavity Enables Sensitive Photothermal Gas Detection

Yan,

Xiao,

Nie

et al. 2024

Laser & Photonics Reviews

View full text Add to dashboard Cite

Laser spectroscopy offers a significant tool for revealing specific molecular details with the desired accuracy and sensitivity. However, it poses challenges to maintain high sensitivity when targeting a micro‐region. Here, a dual‐enhanced photothermal approach is presented using a high‐finesse fiber Fabry–Pérot (F–P) cavity, tailored for highly sensitive chemical sensing with nanoliter‐scale light–matter interaction. A spheric surface (diameter: 50 µm, radius of curvature: 910 µm) is created on the fiber tip using focused ion beam milling. By adding a high‐reflectivity dielectric coating to the spheric surface, a fiber F–P cavity is obtained with a length of 473 µm and a finesse exceeding 4000. The intra‐cavity pump light within the gas‐filled fiber cavity generates a strong photothermal effect upon gas absorption. This effect induces phase modulation, which is amplified and detected by coupling a probe laser to the fiber cavity‐based interferometer. A minimum detection limit of 10 parts‐per‐billion (ppb) of C2H2 at 1530.37 nm is demonstrated using only 1 mW of pump power, corresponding to a normalized noise equivalent absorption coefficient of 9.1×10−11 cm−1∙W∙Hz−1/2. This platform breaks the bottleneck of ultrasensitive gas detection with a very short light–matter interaction length, promising significant advancements in microscale chemical analysis through optical investigations.

show abstract