Research output: Contribution to journal › Article › peer-review
Control of mode anticrossings in whispering gallery microresonators. / Werner, Christoph S.; Sturman, Boris; Podivilov, Evgeniy et al.
In: Optics Express, Vol. 26, No. 2, 22.01.2018, p. 762-771.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Control of mode anticrossings in whispering gallery microresonators
AU - Werner, Christoph S.
AU - Sturman, Boris
AU - Podivilov, Evgeniy
AU - Manjeshwar, Sushanth Kini
AU - Buse, Karsten
AU - Breunig, Ingo
PY - 2018/1/22
Y1 - 2018/1/22
N2 - Optical microresonators attract strong interest because of exciting effects and applications ranging from sensing of single atoms and molecules to quantum and nonlinear optics. For all this, control and tuning of the discrete resonances are vital. In resonators made of anisotropic materials that are beneficial for nonlinear-optical applications, anticrossings of ordinarily (o) and extraordinarily (e) polarized modes occur regularly. This effect is badly understood and harmful for mode control and tuning. We show that the anticrossings are inherent in the o- and e-modes because of the vectorial properties of Maxwell's equations. Within a novel pertubative approach employing a strong localization of the modes near the resonator rim, we have quantified the anticrossings. The values of avoidance gaps strongly exceeding the linewidths and selection rules for the interacting modes are predicted. The inferred values of the avoidance gaps are confirmed experimentally in resonators made of lithium niobate. Furthermore, based on theory, we have eliminated the anticrossings completely by spatially-controlled introduction of defects. This paves the way for unperturbed tuning of anisotropic microresonators.
AB - Optical microresonators attract strong interest because of exciting effects and applications ranging from sensing of single atoms and molecules to quantum and nonlinear optics. For all this, control and tuning of the discrete resonances are vital. In resonators made of anisotropic materials that are beneficial for nonlinear-optical applications, anticrossings of ordinarily (o) and extraordinarily (e) polarized modes occur regularly. This effect is badly understood and harmful for mode control and tuning. We show that the anticrossings are inherent in the o- and e-modes because of the vectorial properties of Maxwell's equations. Within a novel pertubative approach employing a strong localization of the modes near the resonator rim, we have quantified the anticrossings. The values of avoidance gaps strongly exceeding the linewidths and selection rules for the interacting modes are predicted. The inferred values of the avoidance gaps are confirmed experimentally in resonators made of lithium niobate. Furthermore, based on theory, we have eliminated the anticrossings completely by spatially-controlled introduction of defects. This paves the way for unperturbed tuning of anisotropic microresonators.
KW - POLARIZATION CONVERSION
KW - RESONATORS
KW - DISPERSION
KW - WAVE
UR - http://www.scopus.com/inward/record.url?scp=85040961543&partnerID=8YFLogxK
U2 - 10.1364/OE.26.000762
DO - 10.1364/OE.26.000762
M3 - Article
C2 - 29401956
AN - SCOPUS:85040961543
VL - 26
SP - 762
EP - 771
JO - Optics Express
JF - Optics Express
SN - 1094-4087
IS - 2
ER -
ID: 9327945