Photonics Research, Volume. 8, Issue 9, 1457(2020)
Review of exceptional point-based sensors
Fig. 1. Illustration of the enhanced frequency splitting induced by perturbing a non-Hermitian Hamiltonian at an exceptional point of second order (red curve) compared to the case of a conventional degeneracy (blue dash-dotted curve). In both cases, the same perturbation has been applied. (a) Splitting versus perturbation strength
Fig. 2. Two proposals for EP-based sensors. (a) Microdisk cavity with two external scatterers (particles or nano-tips on the right) which implement an
Fig. 3. Various experimental realizations of EP-based sensors. (a) Optical image of a microtoroidal cavity together with a fiber-taper waveguide and three nano-tips for particle detection. Reprinted by permission from Springer Nature: Nature [73], copyright 2017. (b) Illustration and SEM (scanning electron microscope) image of a
Fig. 4. Results on the microtoroidal sensor in the experiment of Chen
Fig. 5. Fundamental limit of an EP-based laser gyroscope due to excess quantum noise [94]. (a) Measured stimulated Brillouin laser (SBL) beating frequency versus pump detuning (which determines the frequency detuning of the uncoupled SBL modes) for different locking zones. The inset shows an Allan deviation measurement of frequency
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Jan Wiersig. Review of exceptional point-based sensors[J]. Photonics Research, 2020, 8(9): 1457
Category: Physical Optics
Received: Apr. 29, 2020
Accepted: Jun. 27, 2020
Published Online: Aug. 19, 2020
The Author Email: Jan Wiersig (jan.wiersig@ovgu.de)