Ultra-Sensitive Biochemical Optical Detection Using Distributed Feedback Nanolasers
Circular resonators are promising candidates for a wide range of applications, ranging from research involving highly confined fields and strong photon-atom interactions such as cavity QED to optical communication systems and biochemical sensing. For sensing applications, circular cavities exhibit a great potential for achieving ultra-high sensitivity while retaining compact dimensions. The main characteristics of circular resonators are the Q-factor, the free spectral range (FSR), and the modal volume, where the last two are primarily determined by the resonator radius. The total-internal-reflection mechanism employed in “conventional” resonators couples between these characteristics and limits the ability to realize compact devices exhibiting large FSR, small modal volume, and high Q. Recently, a new class of annular resonator, based on a single defect surrounded by radial Bragg reflectors, has been proposed and analyzed. The radial Bragg confinement decouples the modal volume and the Q and paves a new way for the realization of compact and low loss resonators. Such properties as well as the unique mode profile of these circular Bragg nanolasers make this class of devices an excellent tool for ultra-sensitive biochemical detection as well as for studies in nonlinear optics.
KeywordsPump Power Bragg Reflector Total Internal Reflection Resonance Wavelength Mode Profile
This research was supported by the Israeli Ministry of Science and Technology.
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