Optical Spectra and Output Coupling Engineering in Hybrid WG-Mode Micro- and Meso-scale Cavity Structures

Boriskina, Svetlana V.; Pishko, S.V.; Boriskin, Artem

doi:10.1109/icton.2006.248246

Cited by 3 publications

(6 citation statements)

References 21 publications

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“…Nevertheless, highly directional emission patterns have also been demonstrated in optically-large double-disk molecules operating on high-azimuthal-order WG modes [36]. Precise positioning of the cavities in the optimized configuration can be achieved with modern fabrication techniques [30], and the estimates of the sensitivity of photonic molecule characteristics to size and position disorder can be found in [37] and [31]. It should also be noted that while TE and TM spectra of photonic molecules of the same configuration have similar features that are mainly determined by the symmetry properties of the molecular geometry and inter-cavity coupling distances [34], their emission patterns can differ drastically [37].…”

Section: Coupled-microdisk Photonic Moleculesmentioning

confidence: 99%

Directional Emission, Increased Free Spectral Range, and Mode $Q$-Factors in 2-D Wavelength-Scale Optical Microcavity Structures

Boriskina

Benson

Sewell

et al. 2006

IEEE J. Select. Topics Quantum Electron.

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Achieving single-mode operation and highly directional (preferably unidirectional) in-plane light output from whispering-gallery (WG) mode semiconductor microdisk resonators without seriously degrading the mode Q-factor challenges designers of low-threshold microlasers. To address this problem, basic design rules to tune the spectral and emission characteristics of micro-scale optical cavity structures with nanoscale features by tailoring their geometry are formulated and discussed in this paper. The validity and usefulness of these rules is demonstrated by reviewing a number of previously studied cavity shapes with global and local deformations. The rules provide leads to novel improved WG-mode cavity designs, two of which are presented: a cross-shaped photonic molecule with introduced asymmetry and a photonic-crystal-assisted microdisk resonator. Both these designs yield degenerate mode splitting, as well as Qfactor enhancement and directional light output of one of the split modes.

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Section: Coupled-microdisk Photonic Moleculesmentioning

confidence: 99%

Directional Emission, Increased Free Spectral Range, and Mode $Q$-Factors in 2-D Wavelength-Scale Optical Microcavity Structures

Boriskina

Benson

Sewell

et al. 2006

IEEE J. Select. Topics Quantum Electron.

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“…Thus the desire for a high Q and that for device miniaturization seem contradictory. Recently the plasmonic cavities, which are capable of further reducing the mode volume to subwavelength scale while maintaining a relatively high Q due to the effect of surface plasmon polaritons (SPPs), are proposed as an alternative [22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

“…Earlier efforts dedicated to the plasmonic microcavities mainly focused on a single disk [22][23][24][25][26][27]. Few of them have investigated the coupling between plasmonic disks.…”

Section: Introductionmentioning

confidence: 99%

Hybrid photonic-plasmonic molecule based on metal/Si disks

Wang¹,

Zhao²,

Du³

et al. 2013

Opt. Express

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Optical properties of two identical coupled disks forming a "hybrid photonic-plasmonic molecule" are investigated. Each disk is a metal-dielectric structure supporting hybrid plasmonic-photonic whispering-gallery (WG) modes. The WG modes of a molecule split into two groups of nearly-degenerate modes, i.e., bonding and anti-bonding modes. The oscillation of quality factor (Q) with the inter-disk gap d and significant enhancement at certain inter-disk gaps can be observed. An enhanced Q factor of 1821 for a hybrid photonic-plasmonic molecule composed of two 1.2 μm-diameter disks, compared with that for a single disk, is achieved. The corresponding Purcell factor is 191, making the hybrid photonic-plasmonic molecule an optimal choice for subwavelength-scale device miniaturization and light-matter interactions. Moreover, the far-field emission pattern of the hybrid photonic-plasmonic molecule exhibits an enhanced directional light output by tuning the azimuthal mode number for both bonding and anti-bonding modes.

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“…On the other hand, combining record Q-factors achieved in WG-mode optical microcavities with exceptionally strong sub-wavelength field confinement observed in noble-metal nano-particles supporting surface plasmon resonances (Fig. 5c) is expected to result in the development of new classes of highly sensitive biosensors [19,20]. To achieve the desired functionality of such hybrid devices, both micro-and nano-scale cavities have to be spectrally and geometrically engineered to maximize spatial and spectral overlap between their respective modal fields.…”

Section: Enhanced Sensitivity To Environmental Changesmentioning

confidence: 99%

“…When several microcavities are electromagnetically coupled via their near-fields, this coupling also modifies their farfield emission characteristics. We have shown that by tuning the photonic molecule geometry, it is possible to design structures featuring only few narrow beams in the far-field pattern [20][21][22]. One of such structures is the photonic molecule composed of identical WG-mode microdisks arranged into an equilateral triangle shown in Fig.…”

Section: Directional Emission From Photonic Moleculesmentioning

confidence: 99%

Photonic molecules made of matched and mismatched microcavities: new functionalities of microlasers and optoelectronic components

2007

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Photonic molecules, named by analogy with chemical molecules, are clusters of closely located electromagnetically interacting microcavities or "photonic atoms". As two or several microcavities are brought close together, their optical modes interact, and a rich spectrum of photonic molecule supermodes emerges, which depends both on geometrical and material properties of individual cavities and on their mutual interactions. Here, we discuss ways of controllable manipulation of photonic molecule supermodes, which improve or add new functionalities to microcavity-based optical components. We present several optimally-tuned photonic molecule designs for lowering thresholds of semiconductor microlasers, producing directional light emission, enhancing sensitivity of microcavity-based bio(chemical)sensors, and optimizing electromagnetic energy transfer around bends of coupled-cavity waveguides. Photonic molecules composed of identical microcavities as well as of microcavities with various degrees of size or material detuning are discussed. Microwave experiments on scaled photonic molecule structures are currently under way to confirm our theoretical predictions.

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Optical Spectra and Output Coupling Engineering in Hybrid WG-Mode Micro- and Meso-scale Cavity Structures

Cited by 3 publications

References 21 publications

Directional Emission, Increased Free Spectral Range, and Mode $Q$-Factors in 2-D Wavelength-Scale Optical Microcavity Structures

Directional Emission, Increased Free Spectral Range, and Mode $Q$-Factors in 2-D Wavelength-Scale Optical Microcavity Structures

Hybrid photonic-plasmonic molecule based on metal/Si disks

Photonic molecules made of matched and mismatched microcavities: new functionalities of microlasers and optoelectronic components

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