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Imaging Nanophotonic Modes of Microresonators using a Focused Ion Beam.


ABSTRACT: Optical microresonators have proven powerful in a wide range of applications, including cavity quantum electrodynamics1-3, biosensing4, microfludics5, and cavity optomechanics6-8. Their performance depends critically on the exact distribution of optical energy, confined and shaped by the nanoscale device geometry. Near-field optical probes9 can image this distribution, but the physical probe necessarily perturbs the near field, which is particularly problematic for sensitive high quality factor resonances10,11. We present a new approach to mapping nanophotonic modes that uses a controllably small and local optomechanical perturbation introduced by a focused lithium ion beam12. An ion beam (radius ?50 nm) induces a picometer-scale dynamic deformation of the resonator surface, which we detect through a shift in the optical resonance wavelength. We map five modes of a silicon microdisk resonator (Q?20,000) with both high spatial and spectral resolution. Our technique also enables in-situ observation of ion implantation damage and relaxation dynamics in a silicon lattice13,14.

SUBMITTER: Twedt KA 

PROVIDER: S-EPMC4832418 | biostudies-literature | 2016

REPOSITORIES: biostudies-literature

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Imaging Nanophotonic Modes of Microresonators using a Focused Ion Beam.

Twedt Kevin A KA   Zou Jie J   Davanco Marcelo M   Srinivasan Kartik K   McClelland Jabez J JJ   Aksyuk Vladimir A VA  

Nature photonics 20151221


Optical microresonators have proven powerful in a wide range of applications, including cavity quantum electrodynamics<sup>1-3</sup>, biosensing<sup>4</sup>, microfludics<sup>5</sup>, and cavity optomechanics<sup>6-8</sup>. Their performance depends critically on the exact distribution of optical energy, confined and shaped by the nanoscale device geometry. Near-field optical probes<sup>9</sup> can image this distribution, but the physical probe necessarily perturbs the near field, which is part  ...[more]

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