Study of an Integrated-optical Slow-light Ring-resonator for Sensing Applications
نویسندگان
چکیده
Integrated-optical (IO) micro-ring, -disk, and -sphere resonators have been long considered as a good candidate to enhance optical sensor performance. To the best of our knowledge, none of previous reported works [1]-[3] has explicitly attributed such (expected) enhancement to slow-light [4] phenomenon, i.e. a phenomenon where the group velocity of light is much lower than the light velocity in vacuum (c); a phenomenon which obviously can be expected also for a properly-designed ring-resonator circuit [5]. Consequently, none of those works has explicitly made use of this phenomenon for optimizing the sensor performance. Hence, so far, the reported detection limit of ring-resonator based sensor (best reported value around 1E-7 RIU) is in general poorer than IO Mach-Zehnder interferometer (MZI) sensor (best reported value around 1E-8 RIU) [6].
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