Low mode volume slotted photonic crystal single nanobeam cavity

Ryckman, Judson D.; Weiss, Sharon M.

doi:10.1063/1.4742749

Cited by 64 publications

(47 citation statements)

References 41 publications

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“…For example, if one hole is missing in the center of a periodic array of holes, it acts as the defect (see Figure 1d). Except for the introduction of the defects to localize the field, the air-slot [46,89] or the air mode [90] photonic crystal nanobeam cavities can provide a higher quality factor and a lower mode volume. [88] The field is centrally localized, and the cavity mode has a tail of evanescent part that fulfills the same role as a WGM cavity.…”

Section: Microcavity Sensing Mechanismsmentioning

confidence: 99%

“…[88] The field is centrally localized, and the cavity mode has a tail of evanescent part that fulfills the same role as a WGM cavity. Except for the introduction of the defects to localize the field, the air-slot [46,89] or the air mode [90] photonic crystal nanobeam cavities can provide a higher quality factor and a lower mode volume. In contrast to conventional PhCs, nanobeam cavities have one row of regular air holes with a slot (air-slot mode) or without a slot (air mode) between two adjacent cells, which can provide a relatively higher Q factor and smaller mode volume (Q ≈ 10 5 and V ≈ 0.01λ 3 /n air 3 , where n air is the refractive index of the air [90] ).…”

Section: Microcavity Sensing Mechanismsmentioning

confidence: 99%

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Single Nanoparticle Detection Using Optical Microcavities

et al. 2017

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Detection of nanoscale objects is highly desirable in various fields such as early-stage disease diagnosis, environmental monitoring and homeland security. Optical microcavity sensors are renowned for ultrahigh sensitivities due to strongly enhanced light-matter interaction. This review focuses on single nanoparticle detection using optical whispering gallery microcavities and photonic crystal microcavities, both of which have been developing rapidly over the past few years. The reactive and dissipative sensing methods, characterized by light-analyte interactions, are explained explicitly. The sensitivity and the detection limit are essentially determined by the cavity properties, and are limited by the various noise sources in the measurements. On the one hand, recent advances include significant sensitivity enhancement using techniques to construct novel microcavity structures with reduced mode volumes, to localize the mode field, or to introduce optical gain. On the other hand, researchers attempt to lower the detection limit by improving the spectral resolution, which can be implemented by suppressing the experimental noises. We also review the methods of achieving a better temporal resolution by employing mode locking techniques or cavity ring up spectroscopy. In conclusion, outlooks on the possible ways to implement microcavity-based sensing devices and potential applications are provided.

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Section: Microcavity Sensing Mechanismsmentioning

confidence: 99%

Section: Microcavity Sensing Mechanismsmentioning

confidence: 99%

Single Nanoparticle Detection Using Optical Microcavities

et al. 2017

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“…The PhC period a, beam width w, beam thickness t, and air hole radius r are fixed, while the slot width s is quadratically tapered from an initial value to zero over the modulated mirror section. In comparison with previously reported designs with slot width fixed throughout the device, 27 our configuration offers a larger bandgap for mirror modes since at the end of the modulated section, the structure gradually turns to a conventional PhC without air slots. Therefore, it gives more robustness in fabrication and the possibility to design devices in an asymmetric environment, i.e., the device (made of silicon) is placed on top of silicon dioxide and immersed in water.…”

mentioning

confidence: 66%

“…The proposed cavities possess experimental Q factors $12 000, which represent the highest measured value in similar slotted configurations. 21,27 Moreover, our cavities provide strong light confinement in the slotted regions with V m as low as 0.06 (k/n water ) 3 , boosting their performance in sensing applications. The measured refractive index sensitivity is 439 6 3 nm/RIU, more than 5 times better than a typical non-slot nanobeam cavity.…”

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confidence: 98%

Single-nanoparticle detection with slot-mode photonic crystal cavities

Wang

Quan

Kita

et al. 2015

Applied Physics Letters

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Optical cavities that are capable for detecting single nanoparticles could lead to great progress in early stage disease diagnostics and the study of biological interactions on the single-molecule level. In particular, photonic crystal (PhC) cavities are excellent platforms for label-free single-nanoparticle detection, owing to their high quality (Q) factors and wavelength-scale modal volumes. Here, we demonstrate the design and fabrication of a high-Q (>104) slot-mode PhC nanobeam cavity, which is able to strongly confine light in the slotted regions. The enhanced light-matter interaction results in an order of magnitude improvement in both refractive index sensitivity (439 nm/RIU) and single-nanoparticle sensitivity compared with conventional dielectric-mode PhC cavities. Detection of single polystyrene nanoparticles with radii of 20 nm and 30 nm is demonstrated in aqueous environments (D2O), without additional laser and temperature stabilization techniques.

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“…This can be done by slots [7] or dielectric nanoantennas [8]. This mechanism is used for cavities as well as for waveguides [7][8][9][10][11], but also applies for evanescent fields at total internal reflection [12].…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of subwavelength field effects in photonic crystal slab cavities

2020

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Surface coupling of single quantum emitters to optical cavities consisting of a photonic crystal slab is a delicate yet crucial task for photonic quantum applications. By coupling through the evanescent surface field only small Purcell factors can be achieved. Here, we propose to introduce a pit in the slab to position the emitter closer to the mode field maximum. Photonic crystal slab L3 cavities are investigated with respect to quality factor and Purcell effect, using finite element calculations in the frequency domain. That way the spatial distribution of the Purcell factor can be calculated. Introducing a small sized pit to the surface of the photonic crystal cavity can evoke subwavelength field effects, confining the field maximum inside the pit. By engineering a pit in the center of the cavity the Purcell factor can be increased from 176 to 1331, albeit reducing the Q factor from 20769 to 16696.

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Low mode volume slotted photonic crystal single nanobeam cavity

Cited by 64 publications

References 41 publications

Single Nanoparticle Detection Using Optical Microcavities

Single Nanoparticle Detection Using Optical Microcavities

Single-nanoparticle detection with slot-mode photonic crystal cavities

Numerical analysis of subwavelength field effects in photonic crystal slab cavities

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