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Your search keyword '"Jarrett, Jeremy W."' showing total 30 results
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30 results on '"Jarrett, Jeremy W."'

4. Communication: SHG-detected circular dichroism imaging using orthogonal phase-locked laser pulses.

Author

Jarrett, Jeremy W., Xiaoying Liu, Nealey, Paul F., Vaia, Richard A., Cerullo, Giulio, and Knappenberger Jr., Kenneth L.

Subjects
*SECOND harmonic generation, *FEMTOSECOND lasers, *OPTICAL antennas, *MODE-locked lasers, *PHASE transitions, *ATTOSECOND pulses, *CIRCULAR dichroism, *IMAGING systems
Abstract

We demonstrate a novel method for second harmonic generation-detected circular dichroism (CD) imaging based on the use of phase-locked, temporally delayed femtosecond laser pulses. The polarization state of the fundamental wave was controllably changed over 2μ rad by using a birefringent delay line, which provided attosecond inter-pulse delays for orthogonal phase-locked replicas; the achievable phase stability was 14 as. By introducing either a positive or negative delay of ~667 as, we induced a ±μ/2 phase shift between the orthogonally polarized pulses, resulting in left circularly polarized or right circularly polarized light. CD imaging performance using the pulse sequence was compared to results obtained for plasmonic nanoantennas using a rotating quarter-wave plate. The pulse sequence is expected to simplify polarization-resolved optical imaging by reducing experimental artifacts and decreasing image acquisition times. This method can be easily extended to other CD spectroscopy measurements. [ABSTRACT FROM AUTHOR]

Published
2015
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6. Optimization of nonlinear optical localization using electromagnetic surface fields (NOLES) imaging.

Author

Jarrett, Jeremy W., Chandra, Manabendra, and Knappenberger, Kenneth L.

Subjects
*MATHEMATICAL optimization, *NONLINEAR optics, *LOCALIZATION (Mathematics), *ELECTROMAGNETISM, *FIELD theory (Physics), *PLASMONS (Physics), *SIGNALS & signaling
Abstract

The use of plasmon amplification of nonlinear optical wave-mixing signals to generate optical images in which the position of the scattering point source can be determined with nanometer accuracy is described. Solid gold nanosphere dimers were used as a model system for the nonlinear medium, which converted the Ti:sapphire fundamental to its second harmonic frequency. Matching the fundamental wave energy to the localized surface plasmon resonance of the electromagnetically coupled nanospheres was critical for achieving the high localization accuracy. Our technique, named Nonlinear Optical Localization using Electromagnetic Surface fields (NOLES) imaging, routinely yielded nonlinear optical images with 1-nm localization accuracy at rates ≥2 fps and can also be used as a photo-switching localization contrast method. This high level of accuracy in pinpointing the signal point source position exceeded that made possible using conventional diffraction-limited far-field methods by 160×. The NOLES technique, with its high temporal resolution and spatial accuracy that far surpass the performance typical of fluorescence-based imaging, will be relevant for imaging dynamic chemical, biological, and material environments. [ABSTRACT FROM AUTHOR]

Published
2013
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7. Nanoradiator-Mediated Deterministic Opto-Thermoelectric Manipulation

Author

Liu, Yaoran, primary, Lin, Linhan, additional, Bangalore Rajeeva, Bharath, additional, Jarrett, Jeremy W., additional, Li, Xintong, additional, Peng, Xiaolei, additional, Kollipara, Pavana, additional, Yao, Kan, additional, Akinwande, Deji, additional, Dunn, Andrew K., additional, and Zheng, Yuebing, additional

Published
2018
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11. In vivo multiphoton fluorescence imaging with polymer dots

Author

Hassan, Ahmed M., primary, Wu, Xu, additional, Jarrett, Jeremy W., additional, Xu, Shihan, additional, Miller, David R., additional, Yu, Jiangbo, additional, Perillo, Evan P., additional, Liu, Yen-Liang, additional, Chiu, Daniel T., additional, Yeh, Hsin-Chih, additional, and Dunn, Andrew K., additional

Published
2017
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12. Plasmonic Nanostructures: Controlling Plasmon-Enhanced Fluorescence via Intersystem Crossing in Photoswitchable Molecules (Small 38/2017)

Author

Wang, Mingsong, primary, Hartmann, Gregory, additional, Wu, Zilong, additional, Scarabelli, Leonardo, additional, Rajeeva, Bharath Bangalore, additional, Jarrett, Jeremy W., additional, Perillo, Evan P., additional, Dunn, Andrew K., additional, Liz-Marzán, Luis M., additional, Hwang, Gyeong S., additional, and Zheng, Yuebing, additional

Published
2017
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14. In vivo multiphoton imaging of a diverse array of fluorophores to investigate deep neurovascular structure

Author

Miller, David R., primary, Hassan, Ahmed M., additional, Jarrett, Jeremy W., additional, Medina, Flor A., additional, Perillo, Evan P., additional, Hagan, Kristen, additional, Shams Kazmi, S. M., additional, Clark, Taylor A., additional, Sullender, Colin T., additional, Jones, Theresa A., additional, Zemelman, Boris V., additional, and Dunn, Andrew K., additional

Published
2017
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30. ChiralNanostructures Studied Using Polarization-DependentNOLES Imaging.

Author

Jarrett, Jeremy W., Herbert, Patrick J., Dhuey, Scott, Schwartzberg, Adam M., and Knappenberger, Kenneth L.

Subjects
*NANOSTRUCTURED materials, *CHIRALITY, *OPTICAL polarization, *ELECTROMAGNETIC fields, *OPTICAL images, *SECOND harmonic generation, *NONLINEAR optics
Abstract

TheNonlinear Optical Localization using Electromagnetic Surfacefields (NOLES) imaging technique was used to generate optical imagesin which the position of a chiral object could be determined withnanometer precision. Asymmetric gold bowtie nanostructures were usedas a model system with 2D chirality. The bowties functioned as a chiralnonlinear medium that converted the fundamental of a Ti:sapphire laserto its second harmonic frequency. The bowties consisted of two lithographicallyprepared equilateral triangles (base = 75 nm, height = 85 nm, thickness= 25 nm) separated by a 20 nm gap. Asymmetric bowties were formedby lateral displacement of one triangle by 10 nm, yielding C2point group symmetry. The chirality of thebowtie nanostructures was confirmed via nonzero second-harmonic generationcircular dichroism (SHG-CDR) ratios, which came from single-particleSHG measurements. The SHG-CDR ratios were validated using numericalfinite difference time domain simulations that quantified the relativemagnitudes of gap-localized electromagnetic fields at the harmonicfrequency resulting from excitation by left and right circularly (LCPand RCP) and linearly polarized fundamental waves. The relative electricdipolar and magnetic dipolar contributions to the SHG responses weredetermined using single-particle continuous polarization variation(CPV) SHG measurements. The spatial localization precision obtainablefor individual chiral nanostructures was determined by statisticalanalysis of the SHG image point spread function. Our results demonstratedthat both the chiral image contrast, which resulted from LCP and RCPexcitation, and the corresponding localization precision was dependentupon the relative magnetic dipole/electric dipole ratio (G/F). A localization precision of 1.13 ± 0.13nm and left-to-right image enhancements of 400% were obtained forbowties with the highest G/Fratiosusing 5 s frame exposure times. The polarization dependence and magneticdipole amplification confirmed here demonstrate that the NOLES imagingtechnique is a powerful method for studying chiral specimens withhigh spatial precision. [ABSTRACT FROM AUTHOR]

Published
2014
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