6533b7d1fe1ef96bd125c102
RESEARCH PRODUCT
Topologically Protected Twist Edge States for a Resonant Mechanical Laser-Beam Scanner
Julian KöpflerMartin WegenerMuamer KadicMuamer KadicTobias FrenzelJörg Schmaliansubject
PhysicsScannerBand gapbusiness.industryAlternation (geometry)General Physics and Astronomy02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesOptics0103 physical sciencesEdge statesTwist010306 general physics0210 nano-technologyMirror symmetrybusinessChirality (chemistry)Laser beamsdescription
We design a one-dimensional chain of two different alternating three-dimensional elastic chiral unit cells. The chain’s topological band gap, a result of the alternation of unit cells combined with their chirality and an effective mirror symmetry, guarantees a protected edge state, corresponding to a localized twist mode with an eigenfrequency inside the one-dimensional band gap. A small axial modulation at the one end of the beam can excite this resonant twist mode at the other end of the beam, via evanescent modes in the gap. The topological robustness of the edge state allows us to add a micromirror to the other end of the beam, turning the arrangement into a resonant mechanical laser-beam scanner. Its scalable operation frequency makes it attractive for applications.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-03-25 | Physical Review Applied |