论文标题
可调中波红外Fabry-Perot带通滤波器使用相变Gesbte
Tunable mid-wave infrared Fabry-Perot bandpass filters using phase-change GeSbTe
论文作者
论文摘要
我们通过利用相变材料gesbte（GST）作为两个（GE：SI）分布式bragg反射器之间的可调腔介质来展示在MWIR上运行的频谱启动Fabry-Perot带通滤波器。 GST的诱导折射率调制增加了腔的光路长度，红色转移了通带。我们的过滤器具有〜300 nm的频谱可控性，传输效率为60-75％，窄带FWHM为50-65 nm（Q-Factor〜70-90）。我们进一步显示了多光谱的热成像和气体传感。通过将过滤器的初始通带与CO $ _ {2} $振动 - 吸收模式（〜4.25 $μ$ m），可调大气co $ _ {2} $传感和动态羽流可视化添加的CO $ _ {2} $。
We demonstrate spectrally-tunable Fabry-Perot bandpass filters operating across the MWIR by utilizing the phase-change material GeSbTe (GST) as a tunable cavity medium between two (Ge:Si) distributed Bragg reflectors. The induced refractive index modulation of GST increases the cavity's optical path length, red-shifting the passband. Our filters have spectral-tunability of ~300 nm, transmission efficiencies of 60-75% and narrowband FWHMs of 50-65 nm (Q-factor ~70-90). We further show multispectral thermal imaging and gas sensing. By matching the filter's initial passband to a CO$_{2}$ vibrational-absorption mode (~4.25 $μ$m), tunable atmospheric CO$_{2}$ sensing and dynamic plume visualization of added CO$_{2}$ is realized.
