Site-Selective Optical Coupling of PbSe Nanocrystals to Si-Based Photonic Crystal Microcavities

Pattantyus-Abraham, Andras G.; Qiao, Hao; Shan, Jingning; Abel, Keith A.; Wang, Tian-Si; Veggel, Frank C. J. M. van; Young, Jeff F.

doi:10.1021/nl900961r

Cited by 47 publications

(43 citation statements)

References 42 publications

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“…For example, this trapping can be used in the characterization and placement of colloidal quantum dots23. It is also of interest for the study of nanoscale biological interactions; for example, those involving protein-protein interactions4, antigen–antibody binding56, and the manipulation of individual virus particles7.…”

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confidence: 99%

Flow-dependent double-nanohole optical trapping of 20 nm polystyrene nanospheres

Zehtabi-Oskuie

Bergeron

Gordon

2012

Sci Rep

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We study the influence of fluid flow on the ability to trap optically a 20 nm polystyrene particle from a stationary microfluidic environment and then hold it against flow. Increased laser power is required to hold nanoparticles as the flow rate is increased, with an empirical linear dependence of 1 μl/(min×mW). This is promising for the delivery of additional nanoparticles to interact with a trapped nanoparticle; for example, to study protein-protein interactions, and for the ability to move the trapped particle in solution from one location to another.

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confidence: 99%

Flow-dependent double-nanohole optical trapping of 20 nm polystyrene nanospheres

Zehtabi-Oskuie

Bergeron

Gordon

2012

Sci Rep

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“…We achieved an enhanced emission factor of 116 from close-packed PbS quantum-dot/polymer monolayers transferred to a L3 Si photonic-crystal cavity with Q factor around 2860. This is a significant improvement over previously reported Purcell factor[1] of 10 involving colloidal quantum dots [2]. The key factor enabling this result is the ability to deposit a 20nm thick monolayer of close-packed quantum dots onto a photoniccrystal cavity to provide direct contact with the cavity.…”

mentioning

confidence: 65%

Strong Purcell enhancement of emission from close-packed colloidal quantum-dots in a photonic-lattice cavity

Luk

Xiong

Farfan

et al. 2010

2010 IEEE Photonics Society Winter Topicals Meeting Series (WTM)

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High Purcell spontaneous emission enhancement factor of 116 is achieved by integrating a self-assembled, close packed monolayer of colloidal PbS quantum dots with a L3-type silicon photonic crystal cavity.High Q optical microcavities can be used to control the radiative process of dipole emitters, such as quantum dots, through photonic density of states control. By enhancing the spontaneous emission, heat dissipating non-radiative relaxations can be suppressed therefore resulting in greater light emitting efficiency and providing a possibility of extracting multi-exciton energy by the emission process. In order to study the radiative control of quantum dots, it is important to be able to incorporate these emitters without perturbing the optical properties of the cavity. Serious challenges remain in integration of the photonic-crystal cavity structure and quantum dots without significant Q factor degradation. Standard spin-coating techniques fail to retain the inherent Q factor and achieve high quantumdot concentration, consistent film thickness and controlled uniform particle separation from the surface.This paper reports progress in meeting some of these challenges. We achieved an enhanced emission factor of 116 from close-packed PbS quantum-dot/polymer monolayers transferred to a L3 Si photonic-crystal cavity with Q factor around 2860. This is a significant improvement over previously reported Purcell factor[1] of 10 involving colloidal quantum dots [2]. The key factor enabling this result is the ability to deposit a 20nm thick monolayer of close-packed quantum dots onto a photoniccrystal cavity to provide direct contact with the cavity. The quantum-dot density of 10 4 Pm -2 , which is over two orders of magnitude higher than typical with Stranski-Krastanow growth, directly contributes to high emission intensity and mitigates the difficulty of placing dots selectively at the anti-nodes of the optical modes. An optimal mode confinement factor is guaranteed by the uniformity (on the scale of an optical wavelength) of dot density throughout the cavity volume.The experiments were performed with L3 (a row of three missing air holes) photonic-crystal Fig. 1. (a) SEM image of photonic crystal, with upper left inset providing a detailed view of the holes (240nm diameter) and lower right inset showing the hole edges and sidewalls. The lower left inset provides a schematic diagram of the photoluminescence measurement geometry. (b) Top view of two identical L3-type photonic crystal cavities. (c) TEM image of a free-standing PbS quantum dot/P3HT polymer monolayer to be transferred to the photonic crystal surface.

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“…One class of alternative quantum oscillators are colloidal PbSe, PbS and PbSe/CdSe QDs that exhibit strong excitonic transitions at wavelengths m. A number of groups have successfully coupled excitonic emission from such QDs into isolated SOI cavities [24]- [30]. A significant advance was recently reported, where the excitonic emission from PbSe QDs was captured in a PPC microcavity, and transferred to single-mode channel Si waveguides, and then diffracted off-chip using PC grating couplers, using a CMOS-processed, full photonic circuit [30].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Integrated Planar Photonic Crystal Circuits Fabricated by a CMOS Foundry

Schelew

Rieger

Young

2013

J. Lightwave Technol.

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Integrated planar photonic crystal circuits in silicon on insulator were fabricated with a single-etch-step process by a foundry using complementary metal-oxide-semiconductor processing techniques. The devices studied integrate three key elements: i) input/output grating couplers consisting of 2D uniform arrays of holes, ii) single transverse electric (TE)/single transverse magnetic (TM) mode channel waveguides, and iii) a photonic crystal linear three hole defect (L3) microcavity. Experimentally measured s-and p-polarized transmission, both from grating-to-grating through a uniform silicon slab region, and through the channel waveguide/L3 cavity circuit, were quantitatively compared with finite-difference time-domain simulations. Excellent agreement is achieved assuming circular, vertical side-wall holes, but this requires accurate post-fabrication characterization of actual versus nominal device parameters, including especially the silicon device layer thickness. While s-polarized incident radiation excites TE modes that exhibit typical resonant cavity (filter-like) transmission, p-polarized incident radiation excites TM modes that non-resonantly propagate through the circuit with comparable transmission efficiency. The dependence of the grating coupler tuning range on hole diameter, and the addition of a photoresist covering is determined.

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Site-Selective Optical Coupling of PbSe Nanocrystals to Si-Based Photonic Crystal Microcavities

Cited by 47 publications

References 42 publications

Flow-dependent double-nanohole optical trapping of 20 nm polystyrene nanospheres

Flow-dependent double-nanohole optical trapping of 20 nm polystyrene nanospheres

Strong Purcell enhancement of emission from close-packed colloidal quantum-dots in a photonic-lattice cavity

Characterization of Integrated Planar Photonic Crystal Circuits Fabricated by a CMOS Foundry

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