Whispering gallery mode of modified octagonal quasiperiodic photonic crystal single-defect microcavity and its side-mode reduction

Lee, Po-Tsung; Lu, Tsan-Wen; Tsai, Feng-Mao; Lu, Tse Min; Kuo, Hao‐Chung

doi:10.1063/1.2203943

Cited by 14 publications

(12 citation statements)

References 13 publications

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“…The microcavity-utilizing circular Bragg reflector with high finesse is introduced in quasi-radial mode (QRM) and whispering gallery mode (WGM) [4]. PQCs that work in WGM show much stronger confinement than that provided by PCs [5][6][7]. Most microcavity lasers based on PQCs have a low threshold, high Q-factor, and small mode volume [8,9].…”

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Multimode lasing from the microcavity of an octagonal quasi-crystal based on holographic polymer-dispersed liquid crystals

Fuh

2012

Opt. Lett.

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An eightfold photonic quasi-crystal (PQC) sample is fabricated holographically using two-beam interference with multi-exposure based on polymer-dispersed liquid crystals. The transmission spectra from the finite-difference time-domain (FDTD) simulation prove the photonic stop band of the rotational symmetry structure of the sample. The resonant mode of the circular microcavity formed in the PQC is calculated. Amplified spontaneous emission and multimode lasing action are demonstrated from the pumped laser-dye-doped PQC microcavity using a Q-switched neodymium-doped yttrium aluminum garnet (Nd:YAG) pulse laser.

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confidence: 99%

Multimode lasing from the microcavity of an octagonal quasi-crystal based on holographic polymer-dispersed liquid crystals

Fuh

2012

Opt. Lett.

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“…Polygonal microcavities are interesting for their potential use in the same area. WGMs have been demonstrated in hexagonally shaped microcavities [5,7,11], octagonal crystals [10], dodecagonal crystals [9] and cubic ones [2,12]. Square and rectangular microcavities have attracted much interest because they have a large interaction length for waveguide coupling.…”

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confidence: 99%

Resonance modes in rare earth doped microcrystals

Korthout¹,

Smet²,

Poelman³

2011

Optical Materials

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Alkaline earth sulfide phosphors doped with Eu 2+ or Ce 3+ are good candidates for wavelength conversion in LEDs for general lighting applications. A very broad emission spectrum can be obtained by preparing SrS:Eu|SrS:Ce core|shell particles. These microcrystals are rectangular cuboids and can also be efficiently excited with electrons in a scanning electron microscope. The broad emission spectrum, ranging from 450 nm to 650 nm, consists of the combined emission of Ce 3+ and Eu 2+ centers. Using cathodoluminescence (CL) in a scanning electron microscope, evaluation of the emission characteristics of individual cuboids was possible. Sharp peaks in the CL-spectra of individual particles could be observed and described as being resonance modes. The spectral positions and the line widths of resonance modes in these core|shell microcrystals are predicted by an extension of the plane wave model, taking into account the dispersion of the refractive index and the existence of open orbits.

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“…Moreover, in view of their many non-equivalent sites, PQCs exhibit a number of possible different defects useful for field confinement 9 , as well as intrinsic localized modes 10,11 . In this connection, PQC-based optical microcavities have already been successfully fabricated, with the ability of strongly confining the light with both high quality factors and small modal volumes 12,13 .In this Letter, we present a comparative study of the confinement properties of different point-defected PBG cavities made of cylindrical dielectric rods arranged according to representative aperiodic PQC geometries. The study is aimed at highlighting the potential advantages offered by PQC dielectric structures in the design of PBG-based accelerating resonators, with respect to their periodic PC counterparts.…”

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Mode confinement in photonic quasicrystal point-defect cavities for particle accelerators

Gennaro

Savo

Andreone

et al. 2008

Applied Physics Letters

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In this Letter, we present a study of the confinement properties of point-defect resonators in finite-size photonic-bandgap structures composed of aperiodic arrangements of dielectric rods, with special emphasis on their use for the design of cavities for particle accelerators. Specifically, for representative geometries, we study the properties of the fundamental mode (as a function of the filling fraction, structure size, and losses) via 2-D and 3-D full-wave numerical simulations, as well as microwave measurements at room temperature. Results indicate that, for reduced-size structures, aperiodic geometries exhibit superior confinement properties by comparison with periodic ones.A promising approach to the development of new types of compact, efficient microwave particle accelerators is to realize structures having higher frequencies of operation, since this can increase the accelerating field gradient and reduce the power consumption 1 . Unfortunately, in a particle accelerator, the higher the frequency, the stronger the excitation (by the wakefield effect) of higher order modes (HOMs), with a significant reduction of the beam stability. Nowadays accelerators operate at frequencies < ∼ 1 GHz, and they usually rely on waveguide-based HOM dampers in order to efficiently suppress the wakefields. However, at higher ( > ∼ 10 GHz) working frequencies, the standard configurations used for HOM damping become rather cumbersome or even technically unfeasible.In the past, open metallic photonic-crystal (PC) cavities, based on periodic arrangements of inclusions, have been proposed as candidates for a new generation of accelerating cells since they exhibit electromagnetic (EM) responses that can be highly selective in frequency. This property (and others related) arises from the formation of photonic bandgaps (PBGs), whereby multiple scattering of waves by periodic lattices of inclusions acts to prevent the propagation of EM waves within certain frequency ranges. In these structures, an open resonator can be easily created by introducing a lattice defect, e.g., by removing one inclusion. Unlike conventional closed cavities, such a point-defect PBG cavity can be designed to support only one bound mode (strongly localized within the defect region), and mostly extended HOMs. This suggests the possibility of using PBG-based cavities for effective HOM wakefield suppression, without the need for mode couplers or detuning. Indeed, a prototype of a large-gradient accelerator that relies on a metallic PBG structure has been successfully fabricated and experimentally characterized 2 . Superconducting prototypes have been also tested at 4 K, showing quality factors up to ∼ 10 5 , limited by radiation losses only 3 . All-dielectric or hybrid-dielectric PBG structures could also be used, thereby eliminating or reducing the characteristic metallic losses at the frequency of operation, even if at the expense of an increased radiative contribution 4 .Moreover, it should be observed that spatial periodicity is not an essential ingredient...

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Whispering gallery mode of modified octagonal quasiperiodic photonic crystal single-defect microcavity and its side-mode reduction

Cited by 14 publications

References 13 publications

Multimode lasing from the microcavity of an octagonal quasi-crystal based on holographic polymer-dispersed liquid crystals

Multimode lasing from the microcavity of an octagonal quasi-crystal based on holographic polymer-dispersed liquid crystals

Resonance modes in rare earth doped microcrystals

Mode confinement in photonic quasicrystal point-defect cavities for particle accelerators

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