Strong coupling of different cavity modes in photonic molecules formed by two adjacent microdisk microcavities

Lin, Hong-Cheng; Chen, Jhih Hao; Chao, Shih Shing; Lo, Ming Cheng; Lin, Sheng-Di; Chang, Wen‐Hao

doi:10.1364/oe.18.023948

Cited by 26 publications

(24 citation statements)

References 21 publications

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“…[17] To investigate the splitting width variation in a photonic molecule (e.g., coupled disks), a localized heating process has been adopted to tune the optical resonances, which www.advopticalmat.de in fact changes the n eff of one microcavity. [11,41] In our micro spheretube system, the n eff of the microtube can be changed by releasing water molecule layers adsorbed on the tube sur face. [33] To gradually release the water nanolayer, the laser pump power is increased step by step from 1% to 50%, and the resonant spectra were recorded accordingly, as shown in Figure 5a.…”

Section: Anticrossing Behavior Of Coupled Modesmentioning

confidence: 99%

“…This trend agrees with the anticrossing feature observed in con ventional photonic molecules based on two coupled microdisk cavities. [11,41,49] Over the whole tuning process, the split mode of lowenergy branch decreases while the highenergy branch mode increases due to the energy transfer between the split modes. The energy transfer between the two branches is also a clear sign indicating spectral detuning of the microtube mode across the microsphere mode.…”

Section: Wwwadvopticalmatdementioning

confidence: 99%

“…We focus on studying the WGM coupling between the trapped microsphere and microtube cavity with a significant difference of cavity sizes, which is in contrast to pre vious reports where the two externally adjacent microcavities possess highly similar sizes [11,12,41] or slightly mismatched sizes (less than two times). [4][5][6][7]18,[42][43][44] Periodic modulations on A photonic molecule formed by trapping a microsphere cavity into a hollow microtube cavity is demonstrated, which provides a novel design over conventional photonic molecules comprised of solid-core whispering gallery mode microcavities with externally tangent configuration.…”

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confidence: 99%

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Strong Coupling in a Photonic Molecule Formed by Trapping a Microsphere in a Microtube Cavity

Wang

Yin

et al. 2017

Advanced Optical Materials

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role for the efficient intercavity coupling. However, the evanescent field is relatively weak in the reported photonic mole cules because most of the optical field is strongly confined within the coupled cavities (e.g., microdisks, [4,8,11,18] micro toroids, [19] microspheres, [3] microrods, [5,20] and microfibers [7] ). As such, one needs a deliberate control on both the cavity geometries and the intercavity coupling gap to ensure a good spectral match and efficient evanescent coupling between the coupled cavities. [18] Moreover, dynamic tuning of the intercavity coupling strength has been investigated in recent years, which were carried out by advanced and sophisticated techniques such as strain tuning, [21,22] acoustooptic control, [23] and precise micromanipulation techniques. [3] To extend and promote the research in the field of photonic molecules, it is of high interest to design novel photonic molecules extending from adjacent solid microcavities to thinwalled hollow cavities which possess intense evanescent field facilitating intercavity coupling and provide novel strategy for tuning of the coupling strength.Microtube cavities, which are formed by selfrolling of pre strained nanomembranes, feature unique properties such as hollowcore structures and ultrathin cavity walls (≈100-300 nm) for the study of lightmatter interactions and the integration of "labinatube" systems. [24][25][26][27] These key merits enable extensive applications ranging from optofluidic sensing, [28][29][30][31] single cell analysis, [32] dynamic molecular process detection, [33] photon plasmon coupling, [34] to optical spin-orbit coupling.[35] To combine with other media/objects, luminescent quantum dots, [36,37] quantum wells, [38] and organic molecules [39] have been enwrapped into the microtube wall by the rolling up process, which couple photoluminescence (PL) light to the microtube cavities to support whisperinggallery mode (WGM) resonances. [37,40] In this context, a design and demonstration of photonic molecule based on microtube cavity is of fundamental interest for the study of strong optical coupling and the promo tion of its potential applications.Herein, we report a novel design of photonic molecule by trapping a microsphere cavity into the hollow core of a rolled up microtube cavity. We focus on studying the WGM coupling between the trapped microsphere and microtube cavity with a significant difference of cavity sizes, which is in contrast to pre vious reports where the two externally adjacent microcavities possess highly similar sizes [11,12,41] or slightly mismatched sizes (less than two times). [4][5][6][7]18,[42][43][44] Periodic modulations on A photonic molecule formed by trapping a microsphere cavity into a hollow microtube cavity is demonstrated, which provides a novel design over conventional photonic molecules comprised of solid-core whispering gallery mode microcavities with externally tangent configuration. Periodic spectral modulations of mode intensity, resonant mode shift, and quality factor are observed...

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Section: Anticrossing Behavior Of Coupled Modesmentioning

confidence: 99%

Section: Wwwadvopticalmatdementioning

confidence: 99%

mentioning

confidence: 99%

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Strong Coupling in a Photonic Molecule Formed by Trapping a Microsphere in a Microtube Cavity

Wang

Yin

et al. 2017

Advanced Optical Materials

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“…An interesting feature of photonic molecules based on coupled PhC cavities [3]- [7] compared to coupled microdisks [8,9], microspheres [10] or micropillars [11,12] is that they offer considerable design flexibility as regards their geometry. For example, an L3 photonic molecule can have a number of different orientations, including (see Fig.…”

Section: Introductionmentioning

confidence: 99%

Mode structure of coupled L3 photonic crystal cavities

et al. 2011

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Abstract:We investigate the energy splitting, quality factor and polarization of the fundamental modes of coupled L3 photonic crystal cavities. Four different geometries are evaluated theoretically, before experimentally investigating coupling in a direction at 30 • to the line of the cavities. In this geometry, a smooth variation of the energy splitting with the cavity separation is predicted and observed, together with significant differences between the polarizations of the bonding and anti-bonding states. The controlled splitting of the coupled states is potentially useful for applications that require simultaneous resonant enhancement of two transitions. This compares with V = 0.76(λ /n) 3 for an isolated cavity in the same lattice. 20. Three other modes exist between the + − 1 and − − 2 modes. Unfortunately, the close spacings and low quality factors of these other modes [18] make it impractical to identify their peaks unambiguosly in Fig. 3. It is, however, likely that the predicted 1.5 meV splitting of the + + 1 mode is responsible for the most prominent features; the predicted splittings of the other two modes are insufficient to explain the peak around 1.32 eV. 21. Note that the results for the FDTD simluations become inaccurate for the largest cavity separation, since the intensity above the center of the double cavity becomes very low. 22. E. Gallardo, L. J. Martínez, A. K. Nowak, H. P. van der Meulen, J. M. Calleja, C. Tejedor, I. Prieto, D. Granados, A. G. Taboada, J. M. García, and P. A. Postigo, "Emission polarization control in semiconductor quantum dots coupled to a photonic crystal microcavity," Opt. Express 18, 13301-13308 (2010).

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“…[16][17][18] Our polymeric, on-chip PM lasers were fabricated by spincoating a 1.2 mm thick PMMA layer (MicroChem PMMA 950k A6) onto a silicon substrate. To realize active PMs, the laser dye Pyrromethene 597 (Radiant Dyes) was used as gain medium due to its high photostability in polymeric host matrices and high quantum efficiency.…”

Section: Sample Fabricationmentioning

confidence: 99%

Polymeric photonic molecule super-mode lasers on silicon

et al. 2013

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Optically coupled microcavities have emerged as photonic structures with promising properties for investigation of fundamental science as well as for applications. We report on the fabrication and spatially resolved spectroscopy of on-chip photonic molecule (PM) lasers consisting of two coupled, dye-doped polymeric microdisks on a silicon substrate. We investigate the fundamental lasing properties with focus on the spatial distribution of modes, the coupling dependent suppression of lasing modes, and in particular the application-oriented operation of these devices in aqueous environments. By depositing an additional polymer layer onto the lithographically structured cavities made of dye-doped poly(methyl methacrylate), coupling-gap widths below 150 nm with aspect ratios of the micro-/nanostructure exceeding 9 : 1 are achieved. This enables strong optical coupling at visible wavelengths despite relatively small resonator radii of 25 mm. The lasing properties of dye-doped PMs are investigated using spatially resolved micro-photoluminescence (m-PL) spectroscopy. This technique allows for the direct imaging of whispering-gallery modes (WGMs) in the photonics molecules. For subwavelength coupling gaps, we observe lasing from delocalized eigenstates of the PMs (termed in the following as super-modes). Using size-mismatched cavities, the lasing mode suppression for different coupling-gap widths is investigated. We further demonstrate single-mode lasing operation in aqueous environments with PMs, which are realized on a low-cost, polymer-on-silicon platform.

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Strong coupling of different cavity modes in photonic molecules formed by two adjacent microdisk microcavities

Cited by 26 publications

References 21 publications

Strong Coupling in a Photonic Molecule Formed by Trapping a Microsphere in a Microtube Cavity

Strong Coupling in a Photonic Molecule Formed by Trapping a Microsphere in a Microtube Cavity

Mode structure of coupled L3 photonic crystal cavities

Polymeric photonic molecule super-mode lasers on silicon

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