Enlarging the Purcell Enhancement by Inserting a Dielectric Film in Dielectric‐Loaded Surface‐Plasmon‐Polariton Waveguides

Abstract

The deterministic integration of single‐photon emitters with large Purcell enhancements and waveguides is vital for integrated quantum circuits and quantum chips. Purcell enhancements are not only related to waveguide structures, but are also greatly affected by the position of single‐photon emitters in waveguides. Here, the insertion of a thin dielectric film with a controllable thickness between a dielectric strip and a metal surface to precisely position a single‐photon emitter in a dielectric‐load surface‐plasmon‐polariton (DLSPP) waveguide is proposed, and the Purcell enhancement is greatly enlarged. Simulations show that the vertical position of the single‐photon emitter above the metal surface is more important than its in‐plane position in the DLSPP waveguide for achieving enlarged Purcell enhancements. In the experiment, the vertical position of the single‐photon emitter in the modified DLSPP waveguide is controlled by evaporating a thin MgF2 film, and the in‐plane position is controlled by combining aligned electron beam lithography and photoluminescence imaging. The Purcell factor in the emitter‐waveguide system is measured to be Fp = 22.4, which is greater than those obtained using conventional DLSPP waveguides (Fp ≤ 6.0) in previous studies.

Single Photon Emitters Coupled to Plasmonic Waveguides: A Review

“…However, the DLSPP waveguide mode cannot be very confined and therefore high decay-rate enhancements cannot be obtained. Although, recently, enlargement of decay-rate enhancement by a DLSPP waveguide by inserting a dielectric layer has been demonstrated, [75] there is a limit to the confinement of such waveguides. Gap-plasmon waveguides can support very confined mode, and in principle, waveguide circuitry can be fabricated utilizing a similar technique as in the case of DLSPPW.…”

Investigation of an absorption plasmonic electro-optical modulator based on the free carrier dispersion effect in the aluminum doped zinc oxide layer

“…It is necessary to have strong light-matter interactions in order for the electro-optical modulator to exhibit high performance. To achieve this goal, channel plasmon polariton waveguide [17][18][19], gap plasmon waveguide [20][21][22], metal-insulator-metal waveguide [23][24][25], dielectric-loaded surface plasmon polariton waveguide [26][27][28], hybrid plasmon polariton waveguide [29][30][31] have been introduced.…”

Fluorescence of Single Rhodamine Molecules Near the Surface of Gold

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Tuning the spontaneous emission of dipole-like quantum emitters with metallic structures is attractive to many fields such as single-photon source for future quantum technology [1][2][3][4] and surface-enhanced fluorescence for life science and biotechnology. [5][6][7][8][9] Novel metallic structures which support unique plasmonic resonance can offer unprecedented properties for a variety of application fields.

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