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The geometry of a microdisk resonator can be used to control the intensity of its evanescent field. Asymmetric microdisk devices can allow for substantial increase of the distance between the evanescently coupled elements of optoelectronic circuits. OCIS codes: (230.5750) Resonators; (250.3140) Integrated optoelectronic circuitsDielectric microdisk resonators can support high-Q whispering gallery modes (WGMs) where the light is confined close to the boundary of the resonator by total internal reflection. The exceptionally high mode lifetimes and Qfactors offered by these devices, put them among the key components of modern optoelectronic technology that enable high spectral resolution, particularly in applications to wavelength selective systems such WDM demultiplexers and channel add-drop filters [1][2][3].Using these individual elements as the building blocks for an integrated photonic circuit allows for a number of applications, such as e.g. high-order filters with nontrivial frequency response [4]. This approach however requires evanescent coupling between different microdisks and waveguides, which is exponentially sensitive to the separation gap that has to be maintained on the order of a micron with submicron accuracy. Due to the resonant nature of these cavities-based devices strict constraints must be imposed on the fabrication process and fabrication of microdisk resonators adjacent to each other with sufficiently small gap so as to achieve efficient evanescent coupling poses a major challenge.In the present paper we propose to use the resonator geometry to enhance the local evanescent field near the gap between the optically coupled devices, which allows for larger separation gaps and less stringent requirements to its variation. This can be achieved using a new class of dielectric resonators [5] where smooth deformation breaks the circular symmetry of the device. Due to the celebrated Lazutkin theorem [6] these devices still support whisperinggallery modes that retain the high Q values typical for cylindrical microdisk resonators. Breaking the circular symmetry of the device however leads to a strongly asymmetric emission pattern, with significant redistribution of the evanescent field intensity and creation of localized "hot areas" near the boundary. We propose the use of asymmetric resonators in devices such as optical filters since the directional emission pattern can lead to increased evanescent coupling and comparatively higher coupling gap which relieves the issues related to closely fabricating microdisk resonators. Using the resonator geometry to enhance the evanescent field in the gap between optically coupled devices will therefore allow for a larger separation between these units, highly advantageous from the fabrication point of view.We demonstrate the proposed approach using a quadrupolar deformed resonator that is parameterized in polar coordinates ( r,φ ) by r(φ) = r 0 (1 + ε cos(2φ)) , where the deformation parameter ε = 0.05. Fig. 1 shows the simulation results for the light intensity ...
The geometry of a microdisk resonator can be used to control the intensity of its evanescent field. Asymmetric microdisk devices can allow for substantial increase of the distance between the evanescently coupled elements of optoelectronic circuits. OCIS codes: (230.5750) Resonators; (250.3140) Integrated optoelectronic circuitsDielectric microdisk resonators can support high-Q whispering gallery modes (WGMs) where the light is confined close to the boundary of the resonator by total internal reflection. The exceptionally high mode lifetimes and Qfactors offered by these devices, put them among the key components of modern optoelectronic technology that enable high spectral resolution, particularly in applications to wavelength selective systems such WDM demultiplexers and channel add-drop filters [1][2][3].Using these individual elements as the building blocks for an integrated photonic circuit allows for a number of applications, such as e.g. high-order filters with nontrivial frequency response [4]. This approach however requires evanescent coupling between different microdisks and waveguides, which is exponentially sensitive to the separation gap that has to be maintained on the order of a micron with submicron accuracy. Due to the resonant nature of these cavities-based devices strict constraints must be imposed on the fabrication process and fabrication of microdisk resonators adjacent to each other with sufficiently small gap so as to achieve efficient evanescent coupling poses a major challenge.In the present paper we propose to use the resonator geometry to enhance the local evanescent field near the gap between the optically coupled devices, which allows for larger separation gaps and less stringent requirements to its variation. This can be achieved using a new class of dielectric resonators [5] where smooth deformation breaks the circular symmetry of the device. Due to the celebrated Lazutkin theorem [6] these devices still support whisperinggallery modes that retain the high Q values typical for cylindrical microdisk resonators. Breaking the circular symmetry of the device however leads to a strongly asymmetric emission pattern, with significant redistribution of the evanescent field intensity and creation of localized "hot areas" near the boundary. We propose the use of asymmetric resonators in devices such as optical filters since the directional emission pattern can lead to increased evanescent coupling and comparatively higher coupling gap which relieves the issues related to closely fabricating microdisk resonators. Using the resonator geometry to enhance the evanescent field in the gap between optically coupled devices will therefore allow for a larger separation between these units, highly advantageous from the fabrication point of view.We demonstrate the proposed approach using a quadrupolar deformed resonator that is parameterized in polar coordinates ( r,φ ) by r(φ) = r 0 (1 + ε cos(2φ)) , where the deformation parameter ε = 0.05. Fig. 1 shows the simulation results for the light intensity ...
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