A small mode volume tunable microcavity: Development and characterization

Greuter, Lukas; Starosielec, Sebastian; Najer, Daniel; Ludwig, Arne; Duempelmann, Luc; Rohner, Dominik; Warburton, Richard J.

doi:10.1063/1.4896415

Cited by 97 publications

(103 citation statements)

References 16 publications

Supporting

Mentioning

102

Contrasting

Order By: Relevance

“…A coarsely scanned low-power CO 2 laser locally melts the silica surface (i) smoothing out the template shape into the desired form (j). 13 In this work, the favourable regime of low R at shallow D becomes accessible by both post-processing ("top-down," blue dots) and pre-processing ("bottom-up," red dots) methods with a minimum radius of curvature R ¼ 1.2 6 0.1 lm.…”

mentioning

confidence: 99%

“…The strong surface tension of the molten material then leads to a very smooth solidification process, with excellent surface roughness routinely at 1…2 Å . 13,14 The established CO 2 laser ablation process can produce a large range of depression geometries (black dots in Figure 1), yet with a strong but unfortunate correlation between radius R and depression depth D (from Greuter et al 13 ), irrespective of varying fabrication parameters (intensity, pulse duration and pulse train length). While the radius seems to stagnate at R % 5 lm or slightly below, a formed microcavity resonance becomes intrinsically unstable for cavity lengths L > R (or 2R) in a plano-concave (or biconcave) geometry from Gaussian optics theory.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Fabrication of mirror templates in silica with micron-sized radii of curvature

Najer

Renggli

Riedel

et al. 2017

Applied Physics Letters

Self Cite

View full text Add to dashboard Cite

We present the fabrication of exceptionally small-radius concave microoptics on fused silica substrates using CO2 laser ablation and subsequent reactive ion etching. The protocol yields on-axis near-Gaussian depressions with radius of curvature < ∼ 5 µm at shallow depth and low surface roughness of 2 Å. This geometry is appealing for cavity quantum electrodynamics where small mode volumes and low scattering losses are desired. We study the optical performance of the structures within a tunable Fabry-Pérot type microcavity, demonstrate near-coating-limited loss rates (F = 25 000) and small focal lengths consistent with their geometrical dimensions.

show abstract

mentioning

confidence: 99%

mentioning

confidence: 99%

Fabrication of mirror templates in silica with micron-sized radii of curvature

Najer

Renggli

Riedel

et al. 2017

Applied Physics Letters

Self Cite

View full text Add to dashboard Cite

show abstract

“…S10 [47] for the influence of the Purcell factor). This strategy can also be implemented in other cavity-QED systems where low cavity linewidths and large Purcell effects can be combined, such as open-access cavities [59][60][61] or photonic crystal cavities [62][63][64][65].…”

mentioning

confidence: 99%

Reducing Phonon-Induced Decoherence in Solid-State Single-Photon Sources with Cavity Quantum Electrodynamics

et al. 2017

View full text Add to dashboard Cite

Solid-state emitters are excellent candidates for developing integrated sources of single photons. Yet, phonons degrade the photon indistinguishability both through pure dephasing of the zerophonon line and through phonon-assisted emission. Here, we study theoretically and experimentally the indistinguishability of photons emitted by a semiconductor quantum dot in a microcavity as a function of temperature. We show that a large coupling to a high quality factor cavity can simultaneously reduces the effect of both phonon-induced sources of decoherence. It first limits the effect of pure dephasing on the zero phonon line with indistinguishabilities above 97% up to 18K. Moreover, it efficiently redirects the phonon sidebands into the zero-phonon line and brings the indistinguishability of the full emission spectrum from 87% (resp. 24%) without cavity effect to more than 99% (resp 76%) at 0 K (resp. 20 K). We provide guidelines for optimal cavity designs that further minimize the phonon-induced decoherence.Indistinguishable single photons are the building blocks of optical quantum computation protocols and quantum networks [1][2][3]. This has motivated great efforts to develop devices generating on-demand indistinguishable single photons, using solid-state emitters such as diamond color centres [4, 5], molecules [6] or semiconductor quantum dots (QDs) [7][8][9][10][11][12]. In QDs, understanding the extrinsic sources of decoherence such as spin and charge noise [13] has recently enabled impressive progresses in the performances of these sources [11,12]. Yet, acoustic phonons generally remain an intrinsic and limiting source of dephasing.Indeed acoustic phonons are responsible for two kinds of dephasing processes. First, acoustic phonons induce a rapid and partial decay of coherence [14][15][16]. This non-Markovian dephasing dynamics is the time-domain counterpart of the emitter spectrum consisting of a sharp zero-phonon line (ZPL) sitting on top of a broad phonon sideband (PSB) [17][18][19]. Second, acoustic phonons can assist virtual transitions towards higher energy levels, resulting in a Markovian pure dephasing of the ZPL [3]. Such effects impose two severe limitations to obtain indistinguishable photons: (i) to work at low temperatures, typically below 10 K for QDs and (ii) to use spectral postselection of the ZPL. Indeed, even at zero temperature, phonon emission processes result in the presence of a PSB on the low energy side, fundamentally limiting the indistinguishability. In practice, the indistinguishability has been measured to rapidly drop with temperature even with spectral selection [21], and without it remains further away from unity [22].In typical self-assembled QDs, the emission fraction into the ZPL, η ZPL , represents typically 90% of the emission at 4K, a fraction that rapidly drops with temperature. Moreover, the photons emitted in the PSB are essentially incoherent, due to their broadband nature with respect to the natural linewidth. In a Hong-Ou-Mandel (HOM) experiment, only the fraction η ...

show abstract

“…spectroscopy, cavity quantum electrodynamics or more recently in cavity optomechanics 1,2 . In these fields, microscopic fiberbased Fabry-Pérot cavities [3][4][5][6][7][8] open interesting new perspectives owing to their unique properties: One example is their very small mode volume, which allows for stronger coupling to e.g. atomic systems 9 .…”

Section: Introductionmentioning

confidence: 99%

The role of mode match in fiber cavities

Bick

Staarmann

Christoph

et al. 2016

Review of Scientific Instruments

View full text Add to dashboard Cite

We study and realize asymmetric fiber-based cavities with optimized mode match to achieve high reflectivity on resonance. This is especially important for mutually coupling two physical systems via light fields, e.g. in quantum hybrid systems. Our detailed theoretical and experimental analysis reveals that on resonance the interference effect between the directly reflected non-modematched light and the light leaking back out of the cavity can lead to large unexpected losses due to the mode filtering of the incoupling fiber. Strong restrictions for the cavity design result out of this effect and we show that planar-concave cavities are clearly best suited. We validate our analytical model using numerical calculations and demonstrate an experimental realization of an asymmetric fiber Fabry-Pérot cavity with optimized parameters.

show abstract

A small mode volume tunable microcavity: Development and characterization

Cited by 97 publications

References 16 publications

Fabrication of mirror templates in silica with micron-sized radii of curvature

Fabrication of mirror templates in silica with micron-sized radii of curvature

Reducing Phonon-Induced Decoherence in Solid-State Single-Photon Sources with Cavity Quantum Electrodynamics

The role of mode match in fiber cavities

Contact Info

Product

Resources

About