Photonic molecules with a tunable inter-cavity gap

Tobias Siegle; Stefan Schierle; Sarah Kraemmer; Benjamin Richter; Sentayehu F Wondimu; Peter Schuch; Christian Koos; Heinz Kalt

doi:10.1038/lsa.2016.224

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Photonic molecules with a tunable inter-cavity gap

Original Articles

- Photonic molecules with a tunable inter-cavity gap
- Light: Science & Applications Vol. 6, Issue 2, (2017)
- Affiliations：
  
  1.Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany
  2.Zoological Institute, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany
  3.Institute of Microstructure Technology, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany
  4.Institute of Photonics and Quantum Electronics, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany
- Author bio：
  
  T Siegle, Email: tobias.siegle@kit.edu
- Funds：
- DOI：10.1038/lsa.2016.224
  CLC：
- Published：2017-06，
  
  Published Online：07 September 2016，
  
  Received：05 April 2016，
  
  Revised：31 August 2016，
  
  Accepted：05 September 2016
- Accepted：
Scan QR Code
Siegle, T. et al. Photonic molecules with a tunable inter-cavity gap. Light: Science & Applications, 6, e16224 (2017).
DOI：

Siegle, T. et al. Photonic molecules with a tunable inter-cavity gap. Light: Science & Applications, 6, e16224 (2017). DOI： 10.1038/lsa.2016.224.

摘要

Abstract

Optical micro-resonators have broad applications. They are used

for example

to enhance light–matter interactions in optical sensors or as model systems for investigating fundamental physical mechanisms in cavity quantum electrodynamics. Coupling two or more micro-cavities is particularly interesting as it enlarges the design freedom and the field of application. In this context

achieving tunability of the coupling strength and hence the inter-cavity gap is of utmost importance for adjusting the properties of the coupled micro-resonator system. In this paper

we report on a novel coupling approach that allows highly precise tuning of the coupling gap of polymeric micro-resonators that are fabricated side by side on a common substrate. We structure goblet-shaped whispering-gallery-mode resonators on an elastic silicone-based polymer substrate by direct laser writing. The silicone substrate is mechanically stretched in order to exploit the lateral shrinkage to reduce the coupling gap. Incorporating a laser dye into the micro-resonators transforms the cavities into micro-lasers that can be pumped optically. We have investigated the lasing emission by micro-photoluminescence spectroscopy

focusing on the spatial localization of the modes. Our results demonstrate the formation of photonic molecules consisting of two or even three resonators

for which the coupling strengths and hence the lasing performance can be precisely tuned. Flexibility and tunability are key elements in future photonics

making our approach interesting for various photonic applications. For instance

as our coupling approach can also be extended to larger cavity arrays

it might serve as a platform for tunable coupled-resonator optical waveguide devices.

关键词

Keywords

coupled resonatorsphotonic moleculesmicro-laserstunable coupling gapwhispering gallery mode resonators

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