Ultranarrow Second-Harmonic Resonances in Hybrid Plasmon-Fiber Cavities

Ai, Qi; Gui, Lili; Paone, Domenico; Metzger, Bernd; Mayer, Martín; Weber, Ksenia; Fery, Andreas; Gießen, Harald

doi:10.1021/acs.nanolett.8b02005

Cited by 28 publications

(40 citation statements)

References 48 publications

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“…This opens up new possibilities in applications based on collective plasmonic coupling such as lasing, 45,46 photovoltaics, 47 sensing, 48 and higher harmonic plasmonics. 11…”

Section: Resultsmentioning

confidence: 99%

Silver Particles with Rhombicuboctahedral Shape and Effective Isotropic Interactions with Light

et al. 2019

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Truly spherical silver nanoparticles are of great importance for fundamental studies including plasmonic applications, but the direct synthesis in aqueous media is not feasible. Using the commonly employed copper-based etching processes, isotropic plasmonic response can be achieved by etching well-defined silver nanocubes. Whilst spherical like shape is typically prevailing in such processes, we established that there is a preferential growth towards silver rhombicuboctahedra (AgRCOs), which is the thermodynamically most stable product of this synthesis. The rhombicuboctahedral morphology is further evidenced by comprehensive characterization with small-angle X-ray scattering in combination with TEM tomography and high resolution TEM. We also elucidate the complete reaction mechanism based on UV-Vis kinetic studies, and the postulated mechanism can also be extended to all copper-based etching processes.

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“…This opens up new possibilities in applications based on collective plasmonic coupling such as lasing, 45,46 photovoltaics, 47 sensing, 48 and higher harmonic plasmonics. 11…”

Section: Resultsmentioning

confidence: 99%

Silver Particles with Rhombicuboctahedral Shape and Effective Isotropic Interactions with Light

et al. 2019

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“…2(b)). Here the linewidth is larger than that of hybrid Au NR and silica microfiber structure [22,23] due to the relatively larger optical loss of the polymer microfiber and the deviation of the NR orientation from vertical direction with respect to the microfiber length. Then the hybrid Au NR/PAM structure was placed in an airtight chamber with controllable humidity inside.…”

Section: Single-cavity-based Optical Rh Sensormentioning

confidence: 86%

“…Recently, it is found that, a plasmonic Au nanorod (NR) deposited on the surface of a microfiber can excite whispering gallery modes (WGMs) in the cross-section of the microfiber with diameter < 10 μm, and generate narrow-band localized surface plasmon resonance (LSPR) via strong coupling between the WGM and the LSPR modes [22], offering an opportunity for microfiber-based light-matter interaction on a smaller scale [23,24].…”

Section: Introductionmentioning

confidence: 99%

“…Here, by replacing the silica microfiber used in previous work [22][23][24] with a moisturesensitive polyacrylamide (PAM) microfiber, we obtained single-band 10-nm-linewidth plasmon resonance from the coupled WGM and LSPR modes of the hybrid structure, with a cavity size of about 2 μm. Relying on the RH-sensitive resonance shift, we demonstrated an optical humidity sensor with high sensitivity within a large dynamic range.…”

Section: Introductionmentioning

confidence: 99%

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Au nanorod–coupled microfiber optical humidity sensors

et al. 2019

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“…Since then, using amorphous glass microcavities to generate lasers with RE‐ions has been well established . Furthermore, various kinds of lasers, such as Raman lasers and second harmonics, have been developed by applying glass WGM resonators. However, unlike crystals, glasses are amorphous, and they are characterized by relatively large phonon energy and broad phonon energy distribution, which are detrimental to the luminescence of rare earth (RE) ions that serve as the emission centers.…”

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confidence: 99%

Microlaser Output from Rare‐Earth Ion‐Doped Nanocrystal‐in‐Glass Microcavities

Ouyang

Kang

Zhang

et al. 2019

Advanced Optical Materials

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of photons near a circular ring boundary via successive total internal reflections, whispering gallery mode microcavities exhibit ultrahigh Q factors and extremely small mode volumes, leading to greatly enhanced light-matter interactions. [2][3][4] These superior characteristics make WGM microcavities highly attractive for on-chip optical communications, including microlaser sources, [5,6] active filters, [7] optical sensors, [8,9] and others. Using WGM microcavities as resonant cavities for laser oscillations, the light energy density in microcavities is quite high, which results in the reduction of laser thresholds down to the microwatt range. [10][11][12] With an extremely high quality factor and facile processability, inorganic glasses are the most reliable materials for building WGM lasers. In the 1990s, near-infrared lasers were demonstrated in Nd 3+ -doped glass microspheres. [12] Since then, using amorphous glass microcavities to generate lasers with RE-ions has been well established. [11,[13][14][15] Furthermore, various kinds of lasers, such as Raman lasers [16] and second harmonics, [17,18] have been developed by applying glass WGM resonators. However, unlike crystals, glasses are amorphous, and they are characterized by relatively large phonon energy and broad phonon energy distribution, which are detrimental to the luminescence of rare earth (RE) ions that serve as the emission centers. Combining the low phonon energy of the crystalline phase with the excellent mechanical and chemical stability of the oxide matrix, the oxyfluoride nanocrystallized glass ceramic (NGC) has been regarded as an ideal host material for RE ions. [19] However, WGM laser output from NGC microcavities has not yet been reported. The main reason is that the absorption and scattering loss increase rapidly with the growth of nanocrystals in the glass matrix, resulting in the reduction of cavity Q factors that hinders low threshold laser output. To address these obstacles, we carefully designed an excellent oxyfluoride NGC material, where NaYF 4 nanocrystals are crystallized within the borosilicate glass matrix through a controlled heat-treatment process.Since the refractive index of the nanocrystal matches well with the glass matrix, and the sizes of the precipitated nanocrystals are small and uniform, the rise in absorption and scattering losses, which are very harmful to Q factors, are prevented. As a result, Er 3+ -doped NGC microsphere cavities with Q factors as high as 10 6 are obtained, which enables single mode WGM Nanocrystallized glass ceramics (NGCs) are important optical materials, but few studies have focused on their laser actions. Here, by precipitation of NaYF 4 nanocrystals enriched with Er 3+ ions in an oxide glass matrix, great enhancement of the luminescence properties for the NGC microspheres is realized. By carefully matching the refractive index of the glass matrix with that of the NaYF 4 nanocrystals and controlling the size and distribution of the precipitated nanocrystals, the absorption and Rayleigh scat...

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Ultranarrow Second-Harmonic Resonances in Hybrid Plasmon-Fiber Cavities

Cited by 28 publications

References 48 publications

Silver Particles with Rhombicuboctahedral Shape and Effective Isotropic Interactions with Light

Silver Particles with Rhombicuboctahedral Shape and Effective Isotropic Interactions with Light

Au nanorod–coupled microfiber optical humidity sensors

Microlaser Output from Rare‐Earth Ion‐Doped Nanocrystal‐in‐Glass Microcavities

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