ANALYSIS OF THE TRANSMISSION SPECTRA OF OPTICAL MICRORESONATORS USING THE MODE EXTENSION METHOD
D. D. Ruzhitskaya1,2, A. A. Samoilenko2, A. D. Ivanov2, K. N. Min'kov2,3
1Lomonosov Moscow State University, Leninskie Gory, 1, Moscow, 119991
2All-Russian Scientific Research Institute of Optical and Physical Measurements, ul. Ozernaya 46, Moscow, 119361
3Tikhonov Moscow Institute of Electronics and Mathematics, ul. Myasnitskaya 20, Moscow, 101000
Keywords: оптические микрорезонаторы, оптический сенсор, наночастицы, моды «шепчущей галереи», теория адсорбции Ленгмюра, optical microresonators, optical sensor, nanoparticles, whispering gallery modes, Langmuir adsorption theory
Abstract
This paper presents an algorithm for processing the transmission spectra of optical microcavities with whispering gallery modes for use as a nanoparticle detector. The algorithm is based on the broadening of the microresonator resonance curve by precipitation of nanoparticles on the microresonator surface. Experimental results on the detection of particles are compared with Langmuir adsorption theory. The contribution of the instability of the excitation radiation source caused by temperature drift of the resonant frequency to the measurement error is estimated.
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