Unidirectional emission from circular dielectric microresonators with a point scatterer

Abstract

Circular microresonators are micron sized dielectric disks embedded in material of lower refractive index. They possess modes of extremely high Q-factors (low lasing thresholds) which makes them ideal candidates for the realization of miniature laser sources. They have, however, the disadvantage of isotropic light emission caused by the rotational symmetry of the system. In order to obtain high directivity of the emission while retaining high Q-factors, we consider a microdisk with a pointlike scatterer placed off-center inside of the disk. We calculate the resulting resonant modes and show that some of them possess both of the desired characteristics. The emission is predominantly in the direction opposite to the scatterer. We show that classical ray optics is a useful guide to optimizing the design parameters of this system. We further find that exceptional points in the resonance spectrum influence how complex resonance wavenumbers change if system parameters are varied.

11 pages, 14 figures

References in corpus (7)

• Combining directional light output and ultralow loss in deformed microdisks
• Asymmetric scattering and non-orthogonal mode patterns in optical micro-spirals
• Inferring periodic orbits from spectra of simple shaped micro-lasers
• Internal and External Resonances of Dielectric Disks
• Chaos-assisted nonresonant optical pumping of quadrupole-deformed microlasers
• Directional Emission from an Optical Microdisk Resonator with a Point Scatterer
• Resonances in a circular dielectric cavity

Cited by in corpus (18)

• Signatures of three coalescing eigenfunctions
• Leaking Chaotic Systems
• Brillouin-Wigner perturbation theory in open electromagnetic systems
• Nonorthogonal pairs of copropagating optical modes in deformed microdisk cavities
• Resonant state expansion applied to two-dimensional open optical systems
• Cavity QED treatment of scattering-induced efficient free-space excitation and collection in high-Q whispering-gallery microcavities
• Nonhermitian transport effects in coupled-resonator optical waveguides
• Photon blockade in non-Hermitian optomechanical systems with nonreciprocal couplings
• Deformed square resonator lasers for optical frequency comb generation
• Unidirectional light emission from low-index polymer microlasers
• Directional Emission of Dielectric Disks with a Finite Scatterer in the THz Regime
• Recent advances in open billiards with some open problems
• Theory of the nanoparticle-induced frequency shifts of whispering-gallery-mode resonances in spheroidal optical resonators
• Escape through a time-dependent hole in the doubling map
• Quantifying intermittency in the open drivebelt billiard
• Trace formula for a dielectric microdisk with a point scatterer
• Quality factors of deformed dielectric cavities
• Tunable photon blockade in a whispering-gallery-mode microresonator coupled with two nanoparticles