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The emerging field of topological photonics aims to realize photonic structures which are resilient to fabrication imperfections by utilizing ideas developed in topology[1]. In photonics, the topological phases are defined on the reciprocal space and usually are associated with the formation of topologically protected (TP) defect states within photonic band-gaps. In this endeavor the manipulation...
In optomechanical systems, co-localizing light and mechanical oscillations at the nanoscale can lead to strong interaction between photons and phonons. Such optomechanical coupling enables sensitive detection of nanoscale motion, as well as control of the motion through optical forces down to the quantum level [1]. In the vast majority of cases, the optomechanical coupling can be regarded as linear...
We demonstrate an optomechanical system with quantum cooperativity Cq = 4g2/κγ >> 1 already at moderate cryogenic temperature [1]. It is realised as a membrane-in-the-middle system [2] with a high-stress silicon nitride membrane. Here, y = kBT/ħQ is the quantum decoherence rate of the mechanical system due to its thermal bath at temperature T∼4 K, and Q∼107 the mechanical quality factor. In...
Cavities utilizing high-finesse optical resonators provide effective pathlength of several kilometers for light-matter interaction[1]. However as compared to near-IR wavelength region, in the mid-IR region absorption measurements lack high sensitivity due to the combination of highly reflective mirrors and lower detectivity of detectors [2]. To enhance sensitivity beyond the optical effective path...
Silicon photonics circuits are playing more and more important role in optical communication and interconnect fields [1, 2]. Many silicon CMOS technique compatible photonics integrated devices are reported [3, 4]. Most of those silicon components are based on optical waveguide. But conventional integrated optical waveguide is without memory feature. One hand, which makes us in trying to change the...
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