High-resolution laser spectroscopy of molecular constituents

分子成分的高分辨率激光光谱

• 批准号: 371442-2010
• 负责人: LeBris, Karine
• 金额: $ 1.82万
• 依托单位: St. Francis Xavier University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=633129
• 关键词: resolution; laser; spectroscopy; molecular; constituents

Laser spectroscopy finds numerous applications in the development of optical calibration devices, new gas lasers, trace gas and bio-sensors, and the investigation of atmospheric and astrophysical processes. A new laser spectroscopy laboratory is currently being commissioned at St. Francis Xavier University. Three main projectswill be undertaken in this facility:1. Spectroscopic characterization of atmospheric molecules by mid-IR tunable lasers. The mid-IR region is crucial for trace gas detection, as it corresponds to the spectral region where most molecules have strong absorption bands. A mid-IR tunable laser will be used to characterize the spectral properties of atmospheric trace gases. If we know the spectral signatures of molecules, we can detect them in the atmosphere. 2. In-situ detection of trace gases using whispering-gallery modes (WGM) spectroscopy. At specific wavelengths, light undergoes total internal reflection at the surface of a silica micro-resonator, and becomes confined inside. Whispering-gallery modes resonances correspond to light trapped in circular orbits along the equatorial plane of the micro-resonator. The evanescent part of the light extending outside the micro-resonator is very sensitive to its environment. We can, therefore, detect the presence of a gas around the micro-resonator by a variation of the transmitted light. This new spectroscopic technique presents multiple advantages (high sensitivity, low-cost material, possibility of miniaturisation, etc.) and should allow the development of miniature gas sensors.3. In-situ detection of protein by WGM spectroscopy. The WGM spectroscopy setup will be adapted for detection of constituents in liquid. In this application, the WGM circulates along the circumference of a thin-walled micro-sized capillary containing the liquid to analyze. The evanescent field extends beyond the interior surface of the capillary and interacts with the constituents of the liquid, creating a shift in the response wavelength. This technique will be applied to protein detection.

激光光谱学在光学校准装置、新型气体激光器、微量气体和生物传感器的开发以及大气和天体物理过程的研究中得到了广泛的应用。一个新的激光光谱学实验室目前正在圣弗朗西斯泽维尔大学投入使用。该设施将进行三个主要项目：1。大气分子的中红外可调谐激光光谱表征。中红外区域对微量气体检测至关重要，因为它对应于大多数分子具有强吸收带的光谱区域。中红外可调谐激光器将用于表征大气中微量气体的光谱特性。如果我们知道分子的光谱特征，我们就能在大气中探测到它们。2. 利用低语通道模式（WGM）光谱原位检测痕量气体。在特定波长，光在硅微谐振器的表面进行全内反射，并被限制在内部。窃窃私语走廊模式共振对应于沿微谐振器赤道面被困在圆形轨道上的光。延伸到微谐振腔外的光的倏逝部分对其环境非常敏感。因此，我们可以通过透射光的变化来探测微谐振器周围气体的存在。这种新的光谱技术具有多种优点（高灵敏度，低成本材料，小型化的可能性等），并且应该允许微型气体传感器的发展。WGM光谱法原位检测蛋白质。WGM光谱装置将适用于液体成分的检测。在这种应用中，WGM沿着含有要分析的液体的薄壁微型毛细管的圆周循环。消失的场延伸到毛细管的内表面之外，并与液体成分相互作用，产生响应波长的移位。该技术将应用于蛋白质检测。