Emission control of colloidal nanocrystals embedded in Si3N4 photonic crystal H1 nanocavities

Qualtieri, Antonio; Pisanello, Ferruccio; Grande, M.; Stomeo, T.; Martiradonna, Luigi; Epifani, G.; Fiore, Angela; Passaseo, A.; Vittorio, Massimo De

doi:10.1016/j.mee.2009.11.133

Cited by 23 publications

(20 citation statements)

References 21 publications

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“…The photonic crystal mirrors have been realized by means of 17 circular holes. The hole spacing p and the hole radius r have been fixed in order to centre the resonances in the range of wavelengths where chemically synthesized nanocrystals (NCs), such as CdSe/CdS core/shell nanocrystals, exhibit emission peaks [25]. The tapered regions are symmetrically located with respect to the nanocavity and each taper is constituted by 7 holes.…”

Section: Nanobeam Cavity Designmentioning

confidence: 99%

“…We start our analysis by locating the nanobeam resonance wavelength in the quantum dot emission range of our interest (575-595 nm) [25,28], adopting a geometrical configuration characterized by the following parameters: hole spacing p = 222 nm, hole radius r = 70 nm, tapering region constituted by 7 holes with a linear increase of the hole radius in the range 55-70 nm and of the hole spacing in the range 190-222 nm, respectively. Table 1 reports the simulation results when the cavity length L c is varied in the range from 65 nm to 92 nm.…”

Section: Nanobeam Cavity Designmentioning

confidence: 99%

“…FOx is a flowable oxide than can be successfully doped with nanocrystals and can spin coated on flat surface and thermally treated in order to get solid layers. In a previous paper [25] a similar technology has been optimized for 2D Photonic Crystal cavities. In order to assess the performance of the nanobeam, in this paper we start with the optimization of the Q factor and then, by introducing fabrication imperfections compatible with the technological process, we demonstrate that a pseudo-casual disorder introduced in the taper region holes located in proximity of the nanocavity can cause a detrimental decreasing of the performances while it does not alter the nanobeam performance if placed in the mirror region.…”

Section: Introductionmentioning

confidence: 99%

“…We demonstrate that the presence of the low refractive index layer does not affect the performance of the nanobeam cavity that exhibits a Q factor of the order of 10 5 and small mode volume of the order of about 0.02 (λ/n) 3 . The low index layer can be exploited to host CdSe/CdS core/shell nano-emitters leading to a new class of active optical devices [25] where the colloidal nano-crystals can be chemically sensitized and deposited by spin-coating or drop-casting. These structures could be used as active material and high Q factor could lead to the realization of integrated sources for devices devoted to sensing applications.…”

Section: Introductionmentioning

confidence: 99%

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High-Q Photonic Crystal Nanobeam Cavity Based on a Silicon Nitride Membrane Incorporating Fabrication Imperfections and a Low-Index Material Layer

Grande¹,

Calò²,

Petruzzelli³

et al. 2012

PIER B

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Abstract-We detail the optimization of a nanobeam design and show how the fabrication imperfections can affect the optical performance of the device. Then we propose the design of a novel configuration of a photonic crystal nanobeam cavity consisting of a membrane structure obtained by sandwiching a layer of Flowable Oxide (FOx) between two layers of Silicon-Nitride (SiN). Finally, we demonstrate that the presence of a low refractive index layer does not impair the performance of the nanobeam cavity that still exhibits a Q factor and mode volume V of the order of 10 5 and 0.02 (λ/n) 3 , respectively.

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Section: Nanobeam Cavity Designmentioning

confidence: 99%

Section: Nanobeam Cavity Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High-Q Photonic Crystal Nanobeam Cavity Based on a Silicon Nitride Membrane Incorporating Fabrication Imperfections and a Low-Index Material Layer

Grande¹,

Calò²,

Petruzzelli³

et al. 2012

PIER B

View full text Add to dashboard Cite

show abstract

“…It has a unique combination of properties including excellent thermal and chemical stability and non-toxicity making it an attractive material for use in many fields of science, especially in biomedical research [1]. Its sensitivity to electron radiation [2] has lead to its use as a resist for subsequent substrate patterning [3] albeit generally in a modified form [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Direct e-beam lithography of PDMS

Bowen

Cheneler

Robinson

2012

Microelectronic Engineering

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Alignment of Rod‐Shaped Single‐Photon Emitters Driven by Line Defects in Liquid Crystals

Pelliser

Manceau

Lethiec

et al. 2015

Adv Funct Materials

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We use arrays of liquid crystal defects, linear smectic dislocations, to trap semi-conductor CdSe/CdS dot-in-rods which behave as single photon emitters. We combine measurements of the emission diagram together with measurements of the emitted polarization of the single emitters. We show that the dot-inrods are confined parallel to the linear defects to allow for a minimization of the disorder energy associated with the dislocation cores. We demonstrate that the electric dipoles associated with the dotin-rods, tilted with respect to the rods, remain oriented in the plane including the smectic linear defects and being perpendicular to the substrate, most likely due to the dipole/dipole interactions between the dipoles of the liquid crystal molecules and the dot-in-rods ones. Using smectic dislocations, we can consequently orient nanorods along a unique direction for a given substrate, independently of the ligands' nature, without any induced aggregation, leading as well to a fixed azimuthal orientation for the associated dot-in-rods' dipoles. These results open the way for a fine control of nanoparticle anisotropic optical properties, in particular a fine control of single photon emission polarization.Control of single photon emitters is a major objective in the field of nanophotonics.[1] The synthesis of colloidal semiconductor inorganic nanocrystals having specific light-emission properties has been providing important advances in this field. In particular, recent developments in synthesis methodologies, fully compatible with standard nanofabrication technologies have enabled a superior 3 control on nanocrystals composition and morphology.Rod-shaped nanocrystals showing pronounced polarization, behaving as emitting linear dipoles, have been obtained. [2][3][4] The encapsulation of a spherical core into a rod-like shell [5] resulted in non-blinking inorganic single photon emitters, [6] hereafter referred to as dot-in-rods (DRs). Moreover it has been recently shown that, by increasing the thickness of the shell, it is possible to greatly suppress photoluminescence blinking and to improve DRs overall photo-stability, while keeping a low probability of multi-photon emission. [7] Such features are of primary importance when nanocrystalsare used in applications demanding a control of photons'polarization, such as coupling with complex photonic cavities [8][9] or quantum cryptography.[10] The control of the polarization of the emitted light also requires the capacity to control the particle orientation. Howevertechnologies aimed at guiding nanocrystal orientation at the single particle level are still poorly discussed in literature.Alignednanoparticleshave been obtained through mechanical rubbing, [11] short-range interactions [12][13] or patterned substrates. [14] Liquid crystal-like structures, composed of alarge number of elongated nanocrystalsassembled in multi-layers have also been evidenced on both solid substrates [15][16][17][18] and water films. [18][19][20] Orientation and positional ordering of CdS and CdSe...

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Emission control of colloidal nanocrystals embedded in Si3N4 photonic crystal H1 nanocavities

Cited by 23 publications

References 21 publications

High-Q Photonic Crystal Nanobeam Cavity Based on a Silicon Nitride Membrane Incorporating Fabrication Imperfections and a Low-Index Material Layer

High-Q Photonic Crystal Nanobeam Cavity Based on a Silicon Nitride Membrane Incorporating Fabrication Imperfections and a Low-Index Material Layer

Direct e-beam lithography of PDMS

Alignment of Rod‐Shaped Single‐Photon Emitters Driven by Line Defects in Liquid Crystals

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