Details

Autor(en) / Beteiligte

• Pi, Mingquan
• Zheng, Chuantao
• Zhao, Huan
• Peng, Zihang
• Lang, Jiaming
• Ji, Jialin
• Liang, Lei
• Zhang, Yu
• Wang, Yiding
• Tittel, Frank K.

Titel

Mid-infrared ChG-on-MgF 2 waveguide gas sensor based on wavelength modulation spectroscopy

Ist Teil von

• Optics letters, 2021-10, Vol.46 (19), p.4797

Erscheinungsjahr

2021

Link zum Volltext

Quelle

Optica Publishing Group Journals (Optical Society)

Beschreibungen/Notizen

• A novel, to the best of our knowledge, mid-infrared chalcogenide (ChG) on magnesium fluoride ( M g F 2 ) waveguide gas sensor was fabricated by using the lift-off method. M g F 2 was used as a lower cladding layer to increase the external confinement factor for enhancing light–gas interaction. Wavelength modulation spectroscopy (WMS) was used in carbon dioxide ( C O 2 ) detection at the wavelength of 4319 nm ( 2315.2 c m − 1 ). The limit of detection for the 1-cm-long sensing waveguide based on WMS is ∼ 0.3 % , which is > 8 times lower than the same sensor using direct absorption spectroscopy (DAS). The combination of WMS with the waveguide gas sensor provides a new measurement scheme for the performance improvement of on-chip gas detection.