Nano‐Engineering Lattice Dimensionality for a Soft Matter Organic Functional Material

Benight, Stephanie J.; Knorr, Daniel B.; Johnson, Lewis E.; Sullivan, Philip A.; Lao, David; Sun, Jianing; Kocherlakota, Lakshmi S.; Elangovan, A.; Robinson, Bruce H.; Overney, René M.; Dalton, Larry R.

doi:10.1002/adma.201104949

Cited by 28 publications

(24 citation statements)

References 28 publications

(52 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…DLD164 [58] has an analogous donorπ bridge -acceptor structure, but with two modifications: a simple hexyl chain is attached on the donor end for improved solubility, and two alkylbenzoylcoumarin units are attached on the bridge ring. The coumarin-containing units impart good film-forming properties, producing monolithic films that do not crystallize, and have been shown in a similar chromophore system [67,73,74] to have long-range intermolecular cooperativity reducing the rotational degrees of freedom of the NLO portion of the molecule resulting in increased 3 cos θ in spite of the decreased ρ N .…”

Section: Organic Electro-optic Materials -From Microscopic To Macroscmentioning

confidence: 99%

Nonlinearities of organic electro-optic materials in nanoscale slots and implications for the optimum modulator design

et al. 2017

Self Cite

View full text Add to dashboard Cite

The performance of highly nonlinear organic electro-optic (EO) materials incorporated into nanoscale slots is examined. It is shown that EO coefficients as large as 190 pm/V can be obtained in 150 nm wide plasmonic slot waveguides but that the coefficients decrease for narrower slots. Possible mechanism that lead to such a decrease are discussed. Monte-Carlo computer simulations are performed, confirming that chromophore-surface interactions are one important factor influencing the EO coefficient in narrow plasmonic slots. These highly nonlinear materials are of particular interest for applications in optical modulators. However, in modulators the key parameters are the voltage-length product U_πL and the insertion loss rather than the linear EO coefficients. We show record-low voltage-length products of 70 Vµm and 50 Vµm for slot widths in the order of 50 nm for the materials JRD1 and DLD164, respectively. This is because the nonlinear interaction is enhanced in narrow slot and thereby compensates for the reduced EO coefficient. Likewise, it is found that lowest insertion losses are observed for slot widths in the range 60 to 100 nm.

show abstract

Section: Organic Electro-optic Materials -From Microscopic To Macroscmentioning

confidence: 99%

Nonlinearities of organic electro-optic materials in nanoscale slots and implications for the optimum modulator design

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…But in case of thin films of low or moderate thickness, the chains are affected by the substrate on a short distance and the main part of the material does not manifest bulk properties. Moreover, if the thickness of films is sufficient and the polymer chains can build a supramolecular structure, then they can be aligned rather than entangled and, thus, in the first place, optoelectrical properties [22,23] and the polymer structure [24,25,26] are influenced. Evidences for thickness threshold of structural ordering in thin poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) films have been already published [27].…”

Section: Introductionmentioning

confidence: 99%

Thickness dependent structural ordering, degradation and metastability in polysilane thin films: A photoluminescence study on representative σ-conjugated polymers

Urbánek

Kuřitka

2015

Journal of Luminescence

View full text Add to dashboard Cite

Cite this article as: Pavel Urbánek and Ivo Kuřitka, Thickness dependent structural ordering, degradation and metastability in polysilane thin films: A photoluminescence study on representative σ-conjugated polymers, Journal of Luminescence, http://dx. ABSTRACTWe present a fundamental experimental study based on the fluorescence investigation of thin σ-conjugated polymer films, where the dependence of optoelectrical properties and UV degradation on film thickness ranging from nano-to microscale was studied. Such extensive and detailed study was performed for the first time and observed spectral shifts in emission and excitation spectra and UV degradation retardation point towards the conclusions that there exists a threshold thickness where the material degradation behavior, electron delocalization and structure suddenly change. The development of well aligned polymeric chain structure between the nano-and micrometer thickness (on the mesoscale) was shown responsible for the manifested phenomena. The material thicker than critical 500 nm has extremely small Stokes shift, maximum extended σ-delocalization along the silicon polymer backbone and exhibits remarkable UV degradation slowdown and self-recovery ability. On the contrary, the electronic properties of thin films below 80 nm resemble those of random coils in solutions. The films of moderate thickness show relatively steep transition between these two modes of structural ordering and resulting properties. Altogether, we consider this complex phenomenon as a consequence of the mesoscale effect, which is an only recently introduced concept in polymer thin films.

show abstract

“…Critical to the development of reliable theoretical guidance and definition of critical structure/function relationships is the ability to accurately measure linear and nonlinear optical properties, thermal and photochemical stability, etc. We have assembled a unique tool set providing the capability for measurement of molecular first hyperpolarizability by wavelength-agile, femtosecond HRS and by EFISH [11,50], electro-optic activity by modified Teng-Man Ellipsometry and attenuated total reflection (ATR) [11,50], acentric order parameters by variable angle polarized absorption spectroscopy (VAPAS) [11,26] and variable angle spectroscopic ellipsometry (VASE) [11] and by atomic resolution techniques including two photon fluorescence microscopy [1,21], and measurement of photochemical stability at telecommunication wavelengths by pump-probe methods [4,11].…”

Section: Development and Application Of New Characterization Toolsmentioning

confidence: 99%

Nano-Engineering of Active Metamaterials

Dalton¹,

Robinson²

2014

Self Cite

View full text Add to dashboard Cite

Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number.

show abstract

Nano‐Engineering Lattice Dimensionality for a Soft Matter Organic Functional Material

Cited by 28 publications

References 28 publications

Nonlinearities of organic electro-optic materials in nanoscale slots and implications for the optimum modulator design

Nonlinearities of organic electro-optic materials in nanoscale slots and implications for the optimum modulator design

Thickness dependent structural ordering, degradation and metastability in polysilane thin films: A photoluminescence study on representative σ-conjugated polymers

Nano-Engineering of Active Metamaterials

Contact Info

Product

Resources

About