Ultra-High Q/V Fabry-Perot microcavity on SOI substrate

Velha, Philippe; Picard, E.; Charvolin, T.; Hadji, E.; Rodier, Jean-Claude; Lalanne, Philippe; Peyrade, D.

doi:10.1364/oe.15.016090

Cited by 110 publications

(77 citation statements)

References 19 publications

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“…For this condition, the reflection coefficient is zero. Equation (1) can therefore be cast as: tan(α 1 ) = n 2 /n 1 (4) where n 1 and n 2 are the refractive indices of the materials. The incidence angle α 1 can also be related to the propagation constants by…”

Section: A Single Interface At Brewster's Incidencementioning

confidence: 99%

“…Bragg gratings) by engineering a periodic variation of the refractive index into their core or cladding. Thanks to the high refractive-index contrast of SOI, high reflectivity gratings as short as a few tens of micrometres can be fabricated for example by carving circular holes along the wire [4,5] or by the insertion of periodic indentation on the sidewalls [6,7]. Although not studied as extensively, the latter grating design (the photonic wire Bragg grating -PhWBG) has the advantage of facilitating a better flow and interaction with fluids, due to the exposed teeth (rather than laterally enclosed holes) resulting in easier fabrication (reduced RIE-lag effect), and better sensing performance [7].…”

Section: Introductionmentioning

confidence: 99%

“…The majority of publications deals with gratings made by inserting periodic circular hole patterns into the photonic wires (see [4,5] and references therein) -but in this case such a phenomenon appears not to have been reported. The effect is however cursorily mentioned in two papers [9,10] that report theoretical results obtained on structures with a geometry having some similarity to ours, being also based on straight edges and square corners.…”

Section: Introductionmentioning

confidence: 99%

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Closure of the stop-band in photonic wire Bragg gratings

et al. 2009

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Photonic Wire Bragg Gratings, made by periodic insertion of lateral rectangular recesses into photonic wires in silicon-on-insulator, can provide large reflectivity with short device lengths because of their large index contrast. This type of design shows a counter-intuitive behaviour, as we demonstrate -using experimental and numerical data -that it can have low or null reflectance, even for large indentation values. We provide physical insight into this phenomenon by developing a model based on Bloch mode theory, and are able to find an analytical expression for the frequency at which the grating does not sustain the stop-band. Finally we demonstrate that the stop-band closing effect is a general phenomenon that may occur in various types of periodic device that can be modeled as transmission line structures.

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Section: A Single Interface At Brewster's Incidencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Closure of the stop-band in photonic wire Bragg gratings

et al. 2009

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“…High-Q grating resonators have been demonstrated both theoretically and experimentally. Two major approaches are respectively based on tapering the grating near the defect [12,13] and spatially modulating the grating (period or hole radius) without a physical defect section [14,15]. Both approaches aim to define a smooth modal field.…”

Section: Introductionmentioning

confidence: 99%

Designing coupled-resonator optical waveguides based on high-Q tapered grating-defect resonators

Liu

Yariv

2012

Opt. Express

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Abstract:We present a systematic design of coupled-resonator optical waveguides (CROWs) based on high-Q tapered grating-defect resonators. The formalism is based on coupled-mode theory where forward and backward waveguide modes are coupled by the grating. Although applied to strong gratings (periodic air holes in single-mode silicon-on-insulator waveguides), coupled-mode theory is shown to be valid, since the spatial Fourier transform of the resonant mode is engineered to minimize the coupling to radiation modes and thus the propagation loss. We demonstrate the numerical characterization of strong gratings, the design of high-Q tapered grating-defect resonators (Q>2 × 10 6 , modal volume = 0.38·(λ/n) 3 ), and the control of inter-resonator coupling for CROWs. Furthermore, we design Butterworth and Bessel filters by tailoring the numbers of holes between adjacent defects. We show with numerical simulation that Butterworth CROWs are more tolerant against fabrication disorder than CROWs with uniform coupling coefficient.

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“…Over the last decade, various types of optical microcavities were proposed and investigated, including whispering-gallery microcavities, Fabry-Perot microcavities, and photonic crystal microcavities [2]. Among these cavities, the nanobeam photonic crystal microcavity [3][4][5][6][7][8][9][10][11] provides not only a very high Q value, but also an ultrasmall V and an ultracompact footprint. Nanobeam photonic crystal microcavities with Q values even higher than 10 9 were demonstrated [12].…”

mentioning

confidence: 99%

An improved surface-plasmonic nanobeam cavity for higher Q and smaller V

et al. 2012

Chin. Sci. Bull.

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We demonstrate a high-Q hybrid surface-plasmon-polariton-photonic crystal (SP3C) nanobeam cavity. The proposed cavities are analyzed numerically using the three-dimensional finite difference time domain (3D-FDTD) method. The results show that a Q-factor of 2076 and a modal volume V of 0.16(/2n) 3 can be achieved in a 50 nm silica-gap hybrid SP3C nanobeam cavity when it operates at telecommunications wavelengths and at room temperature. V can be further reduced to 0.02(/2n) 3 when the silica thickness decreases to 10 nm, which leads to a Q/V ratio that is 11 times that of the corresponding plasmonic-photonic nanobeam cavity (without silica). The ultrahigh Q/V ratio originates from the low-loss nature and deep sub-wavelength confinement of the hybrid plasmonic waveguide, as well as the mode gap effect used to reduce the radiation loss. The proposed structure is fully compatible with semiconductor fabrication techniques and could lead to a wide range of applications. Considerable efforts are currently focused on exploring ways to increase the quality factor Q and decrease the modal volume V of optical microcavities, because of their significant roles in many fundamental physics studies, including light-matter interactions and device physics [1]. A higher Q value indicates a very long photon lifetime, while a small V means that the cavity can localize the photon in a small spatial volume. Over the last decade, various types of optical microcavities were proposed and investigated, including whispering-gallery microcavities, Fabry-Perot microcavities, and photonic crystal microcavities [2]. Among these cavities, the nanobeam photonic crystal microcavity [3-11] provides not only a very high Q value, but also an ultrasmall V and an ultracompact footprint. Nanobeam photonic crystal microcavities with Q values even higher than 10 9 were demonstrated [12]. Although Q values have been raised considerably by sophisticated designs, the smallest achievable V in a conventional dielectric cavity is bound to the diffraction limit, i.e. it is of the order of several times (/2n) 3 [13]. However, in some cases, an ultrasmall V is more important than a higher Q. For example, when the cavity's resonance linewidth is smaller than the emission linewidth of the emitter, decreasing the effective modal volume is the only way to increase the spontaneous emission rate [14].New microcavity schemes were designed to further decrease V. For example, microcavities based on slot waveguides were proposed [14][15][16][17][18]. Microcavities using surface plasmon polaritons (SPPs) were also studied extensively [19,20]. SPPs are electron density waves excited at and propagating along metal-dielectric interfaces [21,22]. Because of their sub-wavelength confinement of optical fields, they are promising candidates for realization of ultrasmall-V nanocavities. However, the reported Q values of SPP cavities thus far are very small and high Q values were only predicted at cryogenic temperatures [23]. The intrinsic high loss caused by metallic absorption ...

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Ultra-High Q/V Fabry-Perot microcavity on SOI substrate

Cited by 110 publications

References 19 publications

Closure of the stop-band in photonic wire Bragg gratings

Closure of the stop-band in photonic wire Bragg gratings

Designing coupled-resonator optical waveguides based on high-Q tapered grating-defect resonators

An improved surface-plasmonic nanobeam cavity for higher Q and smaller V

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