Subdiffraction Photon Guidance by Quantum-Dot Cascades

Wang, Chia-Jean; Huang, Long; Parviz, Babak A.; Lin, Lih Y.

doi:10.1021/nl061958g

Cited by 46 publications

(35 citation statements)

References 21 publications

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“…14a, b depict the expected trend of consistently higher output with pump excitation [56]. The straight device yields a higher ratio as the overall length is one half that of the corner and there is likely some loss at the junction point.…”

Section: Test Resultsmentioning

confidence: 83%

Nanoscale waveguiding methods

Wang

Lin

2007

Nanoscale Res Lett

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While 32 nm lithography technology is on the horizon for integrated circuit (IC) fabrication, matching the pace for miniaturization with optics has been hampered by the diffraction limit. However, development of nanoscale components and guiding methods is burgeoning through advances in fabrication techniques and materials processing. As waveguiding presents the fundamental issue and cornerstone for ultra-high density photonic ICs, we examine the current state of methods in the field. Namely, plasmonic, metal slot and negative dielectric based waveguides as well as a few sub-micrometer techniques such as nanoribbons, high-index contrast and photonic crystals waveguides are investigated in terms of construction, transmission, and limitations. Furthermore, we discuss in detail quantum dot (QD) arrays as a gain-enabled and flexible means to transmit energy through straight paths and sharp bends. Modeling, fabrication and test results are provided and show that the QD waveguide may be effective as an alternate means to transfer light on sub-diffraction dimensions.

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Section: Test Resultsmentioning

confidence: 83%

Nanoscale waveguiding methods

Wang

Lin

2007

Nanoscale Res Lett

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“…This result is interesting as it has practical application for optical waveguiding where signal amplification and processing relies on energy transfer between QD nanocrystals. 85 When aligning a single laser of energy equivalent to separation between the first exciton state to the input edge of the waveguide, photons generated by stimulated emission may cascade through the LED creating an amplified output. Models of energy transfer efficiency in CdSe systems have been reported by Dayal and colleagues.…”

Section: Resultsmentioning

confidence: 99%

Directed Self-Assembly in Laponite/CdSe/Polyaniline Nanocomposites

et al. 2008

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Laponite films provide versatile inorganic scaffolds with materials architectures that direct the self-assembly of CdSe quantum dots (QDs or EviTags) and catalytic surfaces that promote the in situ polymerization of polyaniline (PANI) to yield novel nanocomposites for light emitting diodes (LEDs) and solar cell applications. Water-soluble CdSe EviTags with varying, overlapping emission wavelengths in the visible spectrum were incorporated using soft chemistry routes within Na-Laponite host film platforms to achieve broadband emission in the visible spectrum. QD concentrations, composition and synthesis approach were varied to optimize photophysical properties of the films and to mediate self-assembly, optical cascading and energy transfer. In addition, aniline tetramers coupled to CdSe (QD-AT) surfaces using a dithioate linker were embedded within Cu-Laponite nanoscaffolds and electronically coupled to PANI via vapor phase exposure. Nanotethering and specific host-guest and guest-guest interactions that mediate nanocomposite photophysical behavior were probed using electronic absorption and fluorescence spectroscopies, optical microscopy, AFM, SEM, powder XRD, NMR and ATR-FTIR. Morphology studies indicated that Lap/QD-AT films synthesized using mixed solvent, layer by layer (LbL) methods exhibited anisotropic supramolecular structures with unique mesoscopic ordering that affords bifunctional networks to optimize charge transport.

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“…Lithographic nanopatterning has provided a valuable approach for the formation of assemblies/clusters down to 15 nm in size2223242526. Additionally, biologically inspired scaffolds have shown promise for the formation of arrays of QDs; examples include: DNA-mediated self-assembly2728293031, genetically engineered bacteriophage viruses32, host-polymers3334, and the use of solid-binding peptide linkers35.…”

mentioning

confidence: 99%

DNA-Mediated Patterning of Single Quantum Dot Nanoarrays: A Reusable Platform for Single-Molecule Control

Huang

Freeley

Palma

2017

Sci Rep

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We present a facile strategy of general applicability for the assembly of individual nanoscale moieties in array configurations with single-molecule control. Combining the programming ability of DNA as a scaffolding material with a one-step lithographic process, we demonstrate the patterning of single quantum dots (QDs) at predefined locations on silicon and transparent glass surfaces: as proof of concept, clusters of either one, two, or three QDs were assembled in highly uniform arrays with a 60 nm interdot spacing within each cluster. Notably, the platform developed is reusable after a simple cleaning process and can be designed to exhibit different geometrical arrangements.

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Subdiffraction Photon Guidance by Quantum-Dot Cascades

Cited by 46 publications

References 21 publications

Nanoscale waveguiding methods

Nanoscale waveguiding methods

Directed Self-Assembly in Laponite/CdSe/Polyaniline Nanocomposites

DNA-Mediated Patterning of Single Quantum Dot Nanoarrays: A Reusable Platform for Single-Molecule Control

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