The European Physical Journal Special Topics

, Volume 223, Issue 10, pp 1989–1994 | Cite as

Crystalline MgF2 whispering gallery mode resonators for enhanced bulk index sensitivity

  • R. ZeltnerEmail author
  • F. Sedlmeir
  • G. Leuchs
  • H. G. L. Schwefel
Regular Article WGM Resonator Materials
Part of the following topical collections:
  1. Taking Detection to the Limit: Biosensing with Optical Microcavities


We report on experiments on refractrometric sensing with crystalline Whispering Gallery Mode (WGM) resonators made of magnesium fluoride, which has a refractive index that is only slightly larger than that of water (Δn ≈ 0.05). The resulting evanescent field of a WGM resonator placed in an aqueous environment penetrates therefore deep into the surrounding medium, which makes it a promising candidate for sensing applications. We measured a bulk index sensitivity of 1.09 nm/RIU (refractive index unit) in a resonator with a radius of R = 2.91 mm and intrinsic Q-factors of more than 108 in aqueous environments. Furthermore, we describe the fabrication process of crystalline WGM resonators.


Refractive Index European Physical Journal Special Topic Polarization Beam Splitter Whispering Gallery Mode Refractive Index Contrast 
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Copyright information

© EDP Sciences and Springer 2014

Authors and Affiliations

  • R. Zeltner
    • 1
    • 2
    Email author
  • F. Sedlmeir
    • 2
    • 3
  • G. Leuchs
    • 1
    • 2
  • H. G. L. Schwefel
    • 1
    • 2
    • 3
  1. 1.Institute for Optics, Information and PhotonicsUniversity of Erlangen-Nuremberg, GermanyErlangenGermany
  2. 2.Max-Planck-Institute for the Science of LightErlangenGermany
  3. 3.School in Advanced Optical TechnologieErlangenGermany

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