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Jedrkiewicz, O., Gatti, A., Brambilla, E., Levenius, M., Tamosauskas, G. & Gallo, K. (2018). Golden Ratio Gain Enhancement in Coherently Coupled Parametric Processes. Scientific Reports, 8, Article ID 11616.
Open this publication in new window or tab >>Golden Ratio Gain Enhancement in Coherently Coupled Parametric Processes
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2018 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, article id 11616Article in journal (Refereed) Published
Abstract [en]

Nonlinear optical processes are an essential tool in modern optics, with a broad spectrum of applications, including signal processing, frequency conversion, spectroscopy and quantum optics. Ordinary parametric devices nevertheless still suffer from relatively low gains and wide spectral emission. Here we demonstrate a unique configuration for phase- matching multiple nonlinear processes in a monolithic 2D nonlinear photonic crystal, resulting in the coherent parametric emission of four signal and idler modes, featuring an exponential gain enhancement equal to the Golden Ratio. The results indicate a new route towards compact high- brightness and coherent sources for multi- photon generation, manipulation and entanglement, overcoming limitations of conventional parametric devices.

Place, publisher, year, edition, pages
Nature Publishing Group, 2018
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-233277 (URN)10.1038/s41598-018-30014-7 (DOI)000440621000033 ()30072813 (PubMedID)2-s2.0-85051069479 (Scopus ID)
Funder
Swedish Research Council, VR 622-2010-526 621-2014-5407
Note

QC 20180821

Available from: 2018-08-21 Created: 2018-08-21 Last updated: 2018-08-21Bibliographically approved
Al-Shammari, R. M., Baghban, M. A., Al-attar, N., Gowen, A., Gallo, K., Rice, J. H. & Rodriguez, B. J. (2018). Photoinduced Enhanced Raman from Lithium Niobate on Insulator Template. ACS Applied Materials and Interfaces, 10(36), 30871-30878
Open this publication in new window or tab >>Photoinduced Enhanced Raman from Lithium Niobate on Insulator Template
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2018 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 10, no 36, p. 30871-30878Article in journal (Refereed) Published
Abstract [en]

Photoinduced enhanced Raman spectroscopy from a lithium niobate on insulator (LNOI)−silver nanoparticle template is demonstrated both by irradiating the template with 254 nm ultraviolet (UV) light before adding an analyte and before placing the substrate in the Raman system (substrate irradiation) and by irradiating the sample in the Raman system after adding the molecule (sample irradiation). The photoinduced enhancement enables up to an ∼sevenfold increase of the surface-enhanced Raman scattering signal strength of an analyte following substrate irradiation, whereas an ∼threefold enhancement above the surface-enhanced signal is obtained for sample irradiation. The photoinduced enhancement relaxes over the course of ∼10 h for a substrate irradiation duration of 150 min before returning to initial signal levels. The increase in Raman scattering intensity following UV irradiation is attributed to photoinduced charge transfer from the LNOI template to the analyte. New Raman bands are observed following UV irradiation, the appearance of which is suggestive of a photocatalytic reaction and highlight the potential of LNOI as a photoactive surface-enhanced Raman spectroscopy substrate.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
Keywords
Raman, SERS, chemical enhancement, ferroelectric, photoinduced
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-235752 (URN)10.1021/acsami.8b10076 (DOI)000444793000096 ()2-s2.0-85052314803 (Scopus ID)
Note

QC 20181004

Available from: 2018-10-03 Created: 2018-10-03 Last updated: 2018-10-08Bibliographically approved
Al-Shammari, R. M., Al-Attar, N., Manzo, M., Gallo, K., Rodriguez, B. J. & Rice, J. H. (2018). Single-Molecule Nonresonant Wide-Field Surface-Enhanced Raman Scattering from Ferroelectrically Defined Au Nanoparticle Microarrays. ACS OMEGA, 3(3), 3165-3172
Open this publication in new window or tab >>Single-Molecule Nonresonant Wide-Field Surface-Enhanced Raman Scattering from Ferroelectrically Defined Au Nanoparticle Microarrays
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2018 (English)In: ACS OMEGA, ISSN 2470-1343, Vol. 3, no 3, p. 3165-3172Article in journal (Refereed) Published
Abstract [en]

Single-molecule detection by surface-enhanced Raman scattering (SERS) is a powerful spectroscopic technique that is of interest for the sensor development field. An important aspect of optimizing the materials used in SERS-based sensors is the ability to have a high density of "hot spots" that enhance the SERS sensitivity to the single-molecule level. Photodeposition of gold (Au) nanoparticles through electric-field-directed self-assembly on a periodically proton-exchanged lithium niobate (PPELN) substrate provides conditions to form well-ordered microscale features consisting of closely packed Au nanoparticles. The resulting Au nanoparticle microstructure arrays (microarrays) are plasmon-active and support nonresonant single-molecule SERS at ultralow concentrations (<10(-9)-10(-13) M) with excitation power densities <1 x 10(-3) W cm(-2) using wide-field imaging. The microarrays offer excellent SERS reproducibility, with an intensity variation of <7.5% across the substrate. As most biomarkers and molecules do not support resonance enhancement, this work demonstrates that PPELN is a suitable template for high-sensitivity, nonresonant sensing applications.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2018
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-225737 (URN)10.1021/acsomega.7b01285 (DOI)000427939400077 ()2-s2.0-85044217007 (Scopus ID)
Funder
Swedish Research Council, 622-2010-526; 621-2011-4040
Note

QC 20180410

Available from: 2018-04-10 Created: 2018-04-10 Last updated: 2018-04-10Bibliographically approved
Neumayer, S. M., Ievlev, A. V., Collins, L., Vasudevan, R., Baghban, M. A., Ovchinnikova, O., . . . Kalinin, S. V. (2018). Surface Chemistry Controls Anomalous Ferroelectric Behavior in Lithium Niobate. ACS Applied Materials and Interfaces, 10(34), 29153-29160
Open this publication in new window or tab >>Surface Chemistry Controls Anomalous Ferroelectric Behavior in Lithium Niobate
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2018 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 10, no 34, p. 29153-29160Article in journal (Refereed) Published
Abstract [en]

Polarization switching in ferroelectric materials underpins a multitude of applications ranging from nonvolatile memories to data storage to ferroelectric lithography. While traditionally considered to be a functionality of the material only, basic theoretical considerations suggest that switching is expected to be intrinsically linked to changes in the electrochemical state of the surface. Hence, the properties and dynamics of the screening charges can affect or control the switching dynamics. Despite being recognized for over 50 years, analysis of these phenomena remained largely speculative. Here, we explore polarization switching on the prototypical LiNbO3 surface using the combination of contact mode Kelvin probe force microscopy and chemical imaging by time-of-flight mass-spectrometry and demonstrate pronounced chemical differences between the domains. These studies provide a consistent explanation to the anomalous polarization and surface charge behavior observed in LiNbO3 and point to new opportunities in chemical control of polarization dynamics in thin films and crystals via control of surface chemistry, complementing traditional routes via bulk doping, and substrate-induced strain and tilt systems.

Keywords
ferroelectrics, surface chemistry, lithium niobate, switching dynamics, scanning probe microscopy, time-of-flight secondary ion mass spectrometry
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-235748 (URN)10.1021/acsami.8b09513 (DOI)000443654600098 ()2-s2.0-85052309282 (Scopus ID)
Note

QC 20181003

Available from: 2018-10-03 Created: 2018-10-03 Last updated: 2018-10-03Bibliographically approved
Al-attar, N., Al-Shammari, R. M., Manzo, M., Gallo, K., Rodriguez, B. J. & Rice, J. H. (2018). Wide-field surface-enhanced Raman scattering from ferroelectrically defined Au nanoparticle microarrays for optical sensing. In: Optics InfoBase Conference Papers: . Paper presented at CLEO: Applications and Technology, CLEO_AT 2018, 13 May 2018 through 18 May 2018. OSA - The Optical Society
Open this publication in new window or tab >>Wide-field surface-enhanced Raman scattering from ferroelectrically defined Au nanoparticle microarrays for optical sensing
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2018 (English)In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2018Conference paper, Published paper (Refereed)
Abstract [en]

The acquisition-time in optical sensors using SERS is vital value. Wide-field SERS is used to perform high-density of hot-spots of GNPs photodeposition on a periodically-protonexchanged- LiNbO3 which, leads to increase the sensitivity at ultralow probe concentrations.

Place, publisher, year, edition, pages
OSA - The Optical Society, 2018
Keywords
Gold, Gold nanoparticles, Lithium compounds, Niobium compounds, Surface scattering, Acquisition time, Hot spot, Optical sensing, Photo-deposition, Surface enhanced Raman Scattering (SERS), Wide field, Raman scattering
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-236441 (URN)10.1364/CLEO_AT.2018.AF2M.5 (DOI)2-s2.0-85049147251 (Scopus ID)9781557528209 (ISBN)
Conference
CLEO: Applications and Technology, CLEO_AT 2018, 13 May 2018 through 18 May 2018
Note

QC 20181022

Available from: 2018-10-22 Created: 2018-10-22 Last updated: 2018-10-30Bibliographically approved
Schollhammer, J., Baghban, M. A. & Gallo, K. (2017). Birefringence-free lithium niobate waveguides. In: Optics InfoBase Conference Papers: . Paper presented at The European Conference on Lasers and Electro-Optics, CLEO_Europe 2017, 25 June 2017 through 29 June 2017. OSA - The Optical Society
Open this publication in new window or tab >>Birefringence-free lithium niobate waveguides
2017 (English)In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2017Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
OSA - The Optical Society, 2017
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-222926 (URN)2-s2.0-85039924595 (Scopus ID)9781557528209 (ISBN)
Conference
The European Conference on Lasers and Electro-Optics, CLEO_Europe 2017, 25 June 2017 through 29 June 2017
Note

QC 20180328

Available from: 2018-03-28 Created: 2018-03-28 Last updated: 2018-03-28Bibliographically approved
Schollhammer, J., Baghban, M. A. & Gallo, K. (2017). Birefringence-Free Lithium Niobate Waveguides. In: 2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC): . Paper presented at 2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC). IEEE
Open this publication in new window or tab >>Birefringence-Free Lithium Niobate Waveguides
2017 (English)In: 2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC), IEEE , 2017Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
IEEE, 2017
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-230871 (URN)000432564600930 ()
Conference
2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
Note

QC 20180618

Available from: 2018-06-18 Created: 2018-06-18 Last updated: 2018-06-19Bibliographically approved
Kilinc, D., Blasiak, A., Baghban, M. A., Carville, N. C., Al-Adli, A., Al-Shammari, R. M., . . . Rodriguez, B. J. (2017). Charge and topography patterned lithium niobate provides physical cues to fluidically isolated cortical axons. Applied Physics Letters, 110(5), Article ID 053702.
Open this publication in new window or tab >>Charge and topography patterned lithium niobate provides physical cues to fluidically isolated cortical axons
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2017 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 110, no 5, article id 053702Article in journal (Refereed) Published
Abstract [en]

In vitro devices that combine chemotactic and physical cues are needed for understanding how cells integrate different stimuli. We explored the suitability of lithium niobate (LiNbO3), a transparent ferroelectric material that can be patterned with electrical charge domains and micro/ nanotopography, as a neural substrate. On flat LiNbO3 z-surfaces with periodically alternating charge domains, cortical axons are partially aligned with domain boundaries. On submicron-deep etched trenches, neurites are aligned with the edges of the topographical features. Finally, we bonded a bicompartmental microfluidic chip to LiNbO3 surfaces patterned by etching, to create isolated axon microenvironments with predefined topographical cues. LiNbO3 is shown to be an emerging neuron culture substrate with tunable electrical and topographical properties that can be integrated with microfluidic devices, suitable for studying axon growth and guidance mechanisms under combined topographical/chemical stimuli.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2017
Keywords
Axons, Topography, Fluidic devices, Etching, Atomic force microscopy
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-203961 (URN)10.1063/1.4975304 (DOI)000394057600046 ()2-s2.0-85011317245 (Scopus ID)
Funder
Swedish Research Council, 622-2010-526Swedish Research Council, 621-2014-5407
Note

QC 20170406

Available from: 2017-03-20 Created: 2017-03-20 Last updated: 2018-10-04Bibliographically approved
Al-Shammari, R. M., Alattar, N., Manzo, M., Gallo, K., Rodriguez, B. J. & Rice, J. H. (2017). Label-free cell membrane detection by Raman spectroscopy using biocompatible gold nanostructure microscale arrays on a ferroelectric template. In: Optics InfoBase Conference Papers: . Paper presented at Frontiers in Optics, FiO 2017, 18 September 2017 through 21 September 2017. OSA - The Optical Society
Open this publication in new window or tab >>Label-free cell membrane detection by Raman spectroscopy using biocompatible gold nanostructure microscale arrays on a ferroelectric template
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2017 (English)In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2017Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
OSA - The Optical Society, 2017
Keywords
Biocompatibility, Cytology, Gold, Gold Nanoparticles, Gold nanostructures, Label free, Membrane detections, Osteoblast-like cells, Photo-deposition, Ferroelectricity
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-222939 (URN)10.1364/FIO.2017.JTu2A.89 (DOI)2-s2.0-85035140435 (Scopus ID)9781557528209 (ISBN)
Conference
Frontiers in Optics, FiO 2017, 18 September 2017 through 21 September 2017
Note

QC 20180327

Available from: 2018-03-27 Created: 2018-03-27 Last updated: 2018-03-27Bibliographically approved
Damm, S., Carville, N. C., Manzo, M., Gallo, K., Rodriguez, B. J. & Rice, J. H. (2017). Protein assemblies on ferroelectrically patterned microarrays of Ag nanoparticles. Paper presented at Joint 25th IEEE International Symposium on the Applications of Ferroelectrics (ISAF) / 13th European Conference on Application of Polar Dielectrics (ECAPD) / Piezoelectric Force Microscopy Workshop (PFM), AUG 21-25, 2016, Tech Univ Darmstadt, Darmstadt, GERMANY. Ferroelectrics (Print), 515(1), 141-148
Open this publication in new window or tab >>Protein assemblies on ferroelectrically patterned microarrays of Ag nanoparticles
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2017 (English)In: Ferroelectrics (Print), ISSN 0015-0193, E-ISSN 1563-5112, Vol. 515, no 1, p. 141-148Article in journal (Refereed) Published
Abstract [en]

Nano-bio interfaces play a significant role in assay device design and performance, here we study the use of a combined plasmonic and ferroelectric active substrate design for protein assemblies on a plasmon active array. We demonstrate that biotinylation and protein assemblies can bemade onmetal nanoparticles patterned on ferroelectric substrates. These results inturndemonstratethat ferroelectric substrates combined with active plasmonics is potentially applicable as substrates for biological assays.

Place, publisher, year, edition, pages
TAYLOR & FRANCIS LTD, 2017
Keywords
LiNbO3, SERS, proteins, bacteriochlorophyll, Ag, proton exchange, ferroelectric, silver nanoparticles
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-217772 (URN)10.1080/00150193.2017.1367228 (DOI)000414148100018 ()2-s2.0-85030760787 (Scopus ID)
Conference
Joint 25th IEEE International Symposium on the Applications of Ferroelectrics (ISAF) / 13th European Conference on Application of Polar Dielectrics (ECAPD) / Piezoelectric Force Microscopy Workshop (PFM), AUG 21-25, 2016, Tech Univ Darmstadt, Darmstadt, GERMANY
Note

QC 20171121

Available from: 2017-11-21 Created: 2017-11-21 Last updated: 2017-11-21Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7185-0457

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