Book of Abstracts (Student Talks)

Session 1: Nonlinear Optics {Wednesday, June 6th, 2018, 11:00-12:00}

| Session 1: Nonlinear Optics | Session 2: Quantum Optics | Session 3: Nanophotonics | Session 4: Fibre Optics and Optical Communication | Session 5: Biophotonics | Session 6: Attosecond Science and Optical Techniques |

[NLO Talk 1] Low-noise normal dispersion supercontinuum based on 3 self compressing red shifting solitons {11:00-11:15}

Rasmus Dybbro Engelsholm and Ole Bang

We present a numerical investigation of a novel supercontinuum source for optical coherence tomography. It is based on three solitons red shifting and then undergoing broadening in a flat normal dispersion fiber.

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[NLO Talk 2] Enhancement of frequency doubling efficiency by coherent beam combining of high power diode laser amplifiers {11:15-11:30}

M. T. Jamal, P. Albrodt, A. K. Hansen, O. B. Jensen, G. Blume, P. Crump, K. Paschke, P. Georges and G. Lucas-Leclin

We demonstrate enhancement in frequency doubling efficiency by coherent beam combining (CBC) of two high power tapered amplifiers The improved frequency doubling efficiency by CBC of two amplifiers is η=3.7%/W compared to single amplifier case where η=2.5%/W. This enhancement is due to the better beam quality achieved by CBC. 1.8 W of blue- green light at λ = 488 nm is generated by single-pass second harmonic generation (SHG). The obtained results confirms CBC as a promising power scaling technique in frequency conversion applications.

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[NLO Talk 3] Enhanced SBS threshold in graded index few mode fibers {11:30-11:45}

Neethu M. Mathew, Erik N. Christensen, Lars G-Nielsen, and Karsten Rottwitt

We measure a higher SBS threshold for a two mode graded index fiber compared to a two mode step index fiber.

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[NLO Talk 4] Coherence degradation and noise properties of all-normal dispersion femtosecond supercontinuum generation {11:45-12:00}

E. Genier, P. Bowen, T. Sylvestre, J. Dudley, O. Bang and P. Moselund

We numerically investigate the coherence degradation and noise properties of all-normal dispersion supercontinuum generation (SC). Our work specifically focuses on the temporal coherence degradation by the amplitude noise of femtosecond mode-locked lasers. It is shown for instance that SC coherence drops even for pulse duration of hundreds of femtoseconds when using an amplitude noise of 0.5%.

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Session 2: Quantum Optics {Wednesday, June 6th, 2018, 14:30-15:30}

| Session 1: Nonlinear Optics | Session 2: Quantum Optics | Session 3: Nanophotonics | Session 4: Fibre Optics and Optical Communication | Session 5: Biophotonics | Session 6: Attosecond Science and Optical Techniques |

[QUT Talk 1] Taking Wheeler to space: A satellite implementation of the delayed-choice Gedankenexperiment {14:30-14:45}

Costantino Agnesi, Francesco Vedovato, Matteo Schiavon, Daniele Dequal, Luca Calderaro, Marco Tomasin, Davide Marangon, Andrea Stanco, Vincenza Luceri, Giuseppe Bianco, Giuseppe Vallone and Paolo Villoresi

We report on the realization of Wheeler’s delayed-choice gedankenexperiment by exploiting satellites in LEO orbits to construct an interferometer that extends for thousands of kilometers in space. Our results confirm quantum mechanical predictions, demonstrating the need of the dual wave-particle interpretation at this unprecedented scale.

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[QUT Talk 2] Towards quantum super-resolution in estimating angular and axial separations {14:45-15:00}

Carmine Napoli, Tommaso Tufarelli, Samanta Piano and Gerardo Adesso

Rayleigh’s criterion for two incoherent point sources has been the milestone for optical resolution since its formulation. It amounts to the classical Cramér-Rao lower bound on the mean-squared error of any unbiased estimator of the separation of the sources using photon counting on the image plane. Recent works have shown that a universal limit to optical resolution is given by the quantum Cramér-Rao bound, yielding a mean-squared error that is inversely proportional to the quantum Fisher information and stays finite at arbitrary separation, beating “Rayleigh’s curse”. Modern parameters estimation techniques depend to the control of the emission of sources to increase the localization precision. We propose a mode to generalize the 2-D estimation into 3-D system.

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[QUT Talk 3] Towards chip-to-chip HOM interference for quantum communication applications {15:00-15:15}

L. Cardi, C. Agnesi, B. Da Lio, D. Cozzolino, B. Ben Badir, K. Hassan, Y. Ding, K. Rottwitt and D. Bacco

We use two integrated lasers on two different silicon photonic integrated circuits (PIC) to experimentally observe a stable optical beat, necessary for Hong-Ou-Mandel (HOM) interference based quantum communication protocols.

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[QUT Talk 4] Analysis of Quantum Communications Protocols in Aquatic Scenario {15:15-15:30}

Silvia Tarantino, Daniele Cozzolino, Karsten Rottwitt and Davide Bacco

Security in underwater communications is a sensitive topic for its interest in numerous scientific, industrial and military applications. The aim of this project is to create a feasibility analysis about different types of quantum communications protocols in the aquatic scenario.

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Session 3: Nanophotonics {Wednesday, June 6th, 2018, 16:00-17:15}

| Session 1: Nonlinear Optics | Session 2: Quantum Optics | Session 3: Nanophotonics | Session 4: Fibre Optics and Optical Communication | Session 5: Biophotonics | Session 6: Attosecond Science and Optical Techniques |

[NAP Talk 1] Experimental Realization of a Minimal Microscopic Heat Engine {16:00-16:15}

Aykut Argun, Jalpa Soni, Lennart Dabelow, Stefano Bo, Giuseppe Pesce, Ralf Eichhorn and Giovanni Volpe

Microscopic heat engines are microscale systems that convert energy flows between heat reservoirs into work or systematic motion. We have experimentally realized a minimal microscopic heat engine. It consists of a colloidal Brownian particle optically trapped in an elliptical potential well and simultaneously coupled to two heat baths at different temperatures acting along perpendicular directions. For a generic arrangement of the principal directions of the baths and the potential, the symmetry of the system is broken, such that the heat flow drives a systematic gyrating motion of the particle around the potential minimum. Using the experimentally measured trajectories, we quantify the gyrating motion of the particle, the resulting torque that it exerts on the potential, and the associated heat flow between the heat baths. We find excellent agreement between the experimental results and the theoretical predictions [1].

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[NAP Talk 2] Multiple evidence for room-temperature strong coupling in a hybrid WS2/gold nanodisk-system {16:15-16:30}

Mathias Geisler, Ximin Cui, Bjarke S. Jessen, Peter Bøggild, N. Asger Mortensen, Jianfang Wang, Martijn Wubs, Sanshui Xiao and Nicolas Stenger

The discovery of 2D materials with their strong in-plane bonds and weak out-of-plane van der Waals-interaction holds great promise for many technological applications. Especially the transition metal dichalcogenides (TMDCs, e.g. MoTe2 or WS2) with their semiconducting nature and strong optical response have sparked significant interest. The optical response in these TMDCs is dominated by the excitons, i.e. hydrogen-like electron-hole excitations, which are stable even at room temperature due to the reduced screening by surrounding material in the 2D as compared to a 3D environment. Indeed, for excitons in bulk semiconductors cooling to cryogenic temperatures is typically needed.

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[NAP Talk 3] Graphene and two-dimensional channel plasmons for deep subwavelength waveguiding {16:30-16:45}

P. A. D. Gonçalves, S. Xiao, N. M. R. Peres, and N. A. Mortensen

Here we study plasmon waveguiding and hybridization in V-shaped wedges and grooves covered with a 2D material, e.g., graphene. We determine the plasmon dispersion and ensuing mode properties both using a rigorous Green’s functions method and also using an approximate effective-index approach in which the governing wave equation resembles a Schrödinger equation with an energy potential. Finally, we benchmark our semi-analytical results against full-wave electrodynamic simulations.

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[NAP Talk 4] Planar Plasmonic Antenna Arrays Resolve Transient Nanoscopic Heterogeneities in Biological Membranes {16:45-17:00}

Pamina M. Winkler, Raju Regmi, Valentin Flauraud, Hervé Rigneault, Jürgen Brugger, Jérôme Wenger, María F. García-Parajo

Resolving the various interactions of lipids and proteins in the eukaryotic plasma membrane with high spatiotemporal resolution is of upmost interest [1]. Here, we present planar plasmonic antenna arrays with different nanogap sizes (10-45 nm) combined with fluorescence correlation spectroscopy (FCS) to resolve dynamic nanoscopic heterogeneities in mimetic and living plasma membranes. Our innovative approach confines the excitation light within the fully accessible planarized hotspot region of the nanoantennas yielding giant fluorescence enhancement factors of up to 10 4 -10 5 times together with nanoscale detection volumes in the 20 zeptoliter range [2]. We exploit these planar nanoantenna arrays to investigate the dynamics of individual fluorescently labelled lipids in membrane regions as small as 10 nm in size with microsecond time resolution.

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[NAP Talk 5] Micro-Light Emitting Diodes: Beyond Displays {17:0-17:15}

J. F. C. Carreira, E. Xie, R. Bian, J. J. D. McKendry, B. Guilhabert, I. Watson, H. Hass, E. Gu and M. Dawson

Micro-Light Emitting Diodes (micro-LEDs) are set to revolutionise the displays market, with Apple [1] and Facebook [2] showing huge interest in this technology. Furthermore, micro-LEDs are the perfect light source for visible light communication (VLC) applications. What makes micro-LEDs so special for VLC is that due to their size micro-LEDs exhibit extremely high optical modulation bandwidth, 10 times larger than their broad area counterpart [3, 4]. Following these results, our group has demonstrated that a single monochromatic micro-LED can achieve Gbit/s data transmission rate [5]. This data rate can be even further increased by combining multi-wavelength arrays of micro-LEDs with wavelength/spatial modulation schemes [3]. However, the integration of different colour emitting micro-LEDs into a single transmitter remains a challenge.

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Session 4: Fibre Optics and Optical Communication {Thursday, June 7th, 2018, 11:00-12:00}

| Session 1: Nonlinear Optics | Session 2: Quantum Optics | Session 3: Nanophotonics | Session 4: Fibre Optics and Optical Communication | Session 5: Biophotonics | Session 6: Attosecond Science and Optical Techniques |

[FOC Talk 1] Distributed Acoustic Impedance Measurement Based On Forward Stimulated Brillouin Scattering {11:00-11:15}

Desmond M. Chow, Zhisheng Yang, Marcelo A. Soto and Luc Thévenaz

A technique to measure the local spectrum of forward stimulated Brillouin scattering (FSBS) along a standard optical fiber is proposed. The local acoustic impedance of surrounding material is retrieved from the measured FSBS resonance linewidth.

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[FOC Talk 2] Intramodal parametric amplification in a few-mode fiber {11:15-11:30}

Erik N. Christensen, Neethu M. Mathew, Lars Gruner-Nielsen and Karsten Rottwitt

We experimentally demonstrate intramodal parametric amplification in a graded index few-mode fiber, and show that for an stimulated Brillouin scattering limited pump a 6.3 dB increase in conversion efficiency is achieved for the LP11 over the fundamental LP01 mode.

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[FOC Talk 3] 4D-CM-BPSK – a Noise Tolerant Modulation Format {11:30-11:45}

Soumya Sunder Dash

Constellation modulation offers a new degree of freedom to increase the spectral efficiency and to further approach the Shannon limit. Applying constellation modulation, we derive 4D-CM-BPSK as the most power efficient modulation format that provides a spectral efficiency of 0.83 bits/s/Hz for an SNR of 4 dB at a BER of 1×10-3.

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[FOC Talk 4] Proof of Principle Measurements of Single-Mode Fiber Dispersion with White Light Interferometry {11:45-12:00}

Sandhra-Mirella Valdma, Heli Lukner and Kerttu Maria Peensoo

As the need for quick fiber dispersion measurements in wide spectral range has increased due to growing telecommunication industry we propose a new method using redesigned SEA TADPOLE type interferometer with broadband white light laser. We were able to measure dispersion but using different pieces of fiber we saw how the pieces have a varying dispersion.

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Session 5: Biophotonics {Thursday, June 7th, 2018, 14:30-15:30}

| Session 1: Nonlinear Optics | Session 2: Quantum Optics | Session 3: Nanophotonics | Session 4: Fibre Optics and Optical Communication | Session 5: Biophotonics | Session 6: Attosecond Science and Optical Techniques |

[BOM Talk 1] Mueller Polarimetric Imaging Optimization for Biomedical Applications {14:30-14:45}

Arvid Lindberg, Camille Gennet, Jérémy Vizet, Jean-Charles Vanel and Angelo Pierangelo

Imaging Mueller polarimetry has recently been shown to provide useful contrast in biomedical imaging, notably contrast between healthy tissues and pre-cancerous ones. Promising results have spurred the development of polarimetric instruments for in-vivo applications. Rapid acquisition is crucial for these types of measurements. Among the components to generate polarized light, ferroelectric liquid crystals have emerged as good candidates because of their rapid modulation and large clear aperture. I will present how to extensively characterize these liquid crystals and how to construct and validate optimized instruments with them. I will also show several finished instruments destined for use in various biomedical applications.

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[BOM Talk 2] Near Infrared Light Propagation Modeling of Infant Thorax {14:45-15:00}

Andrea Pacheco, Eugene Dempsey and Stefan Andersson-Engels

Respiratory distress syndrome (RDS) is usually present in preterm born infants [1]. Nowadays pulmonary X-ray imaging together with pulse oxygenation measurements are used to diagnose and follow the clinical course of RDS and to assess lung function.
The Biophotonics@Tyndall team is exploring the Gas in Scattering Media Absorption Spectroscopy (GASMAS) technique as a novel non-invasive method to measure absolute lung oxygen volume and concentration. The feasibility of GASMAS to monitor the lung function of full term babies has been demonstrated previously [2, 3]. We present here results of light propagation simulation in a 3D numerical model of an infant thorax at two different wavelengths – 760 nm and 820 nm. Modelling has been conducted with light source and detector in different configurations to gain a better understanding of the advantages and limitation of the GASMAS technology when assessing lung function in newborns.

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[BOM Talk 3] High-Throughput Multi-Parametric Imaging Of Biological Samples Using A Parallelized SPAD Array Detector {15:00-15:15}

Chetan Poudel and Clemens Kaminski

We present a multi-parametric (x, y, z, τ, λ) imaging system using a prototype detector with a linear array of 32 SPAD pixels, which allows high-throughput TCSPC FLIM and spectral measurements. We demonstrate its superior capability against single PMT systems in imaging applications relating to the study of neurodegenerative diseases.

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[BOM Talk 4] High-Contrast Automated Tumor Localization Without Use of Ionizing Radiation {15:15-15:30}

Edward Xu, Dora C F Inacio and Qianqian Fang

Here we introduce a novel algorithmic approach capable of automatically characterizing malignant lesions and tumor-negative breasts without the use of ionizing, x-ray radiation. We validate this work in numerical phantoms accurately modeling human breast physiology.

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Session 6: Attosecond Science and Optical Techniques {Friday, June 8th, 2018, 11:30-12:30}

| Session 1: Nonlinear Optics | Session 2: Quantum Optics | Session 3: Nanophotonics | Session 4: Fibre Optics and Optical Communication | Session 5: Biophotonics | Session 6: Attosecond Science and Optical Techniques |

[OIM Talk 1] Study of autoionization dynamics in helium by time-frequency characterization of photoelectron wave packets {11:30-11:45}

A. Escoubas, D. Busto, M. Isinger, S. Zhong, S. Nandi, R. J. Squibb, C. Alexandridi, M. Turconi, D. Platzer, L. Barreau, M. Gisselbrecht, P. Salieres, R. Feifel and A. L’Huillier

The recent development of high harmonic generation and attosecond technology has provided the tools that allow us to probe electron dynamics on the attosecond time scale. The presence of a quasi-bound state above the ionizing threshold result in autoionization where the excited state decays to the continuum by Coulomb interaction. It was theoretically described by Fano [1] as a quantum interference effect between the direct path to the continuum and the resonant path giving rise to characteristic asymmetric Fano profile.

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[OIM Talk 2] Light-controlled Assembly of Active Colloidal Molecules {11:45-12:00}

Falko Schmidt, Benno Liebchen, Hartmut Löwen and Giovanni Volpe

We experimentally demonstrate the light-controlled assembly of active colloidal molecules from a suspension of two species of passive microspheres. When light is shone on the sample, the active molecules form and acquire motility through non-reciprocal interactions between their passive components. As their size grows, they feature a complex array of behaviors, becoming propellers, spinners and rotators. Their shape and functionality can be tuned by applying periodic illumination. We also provide a theoretical model allowing to predict the complete table of emerging active molecules and their properties in quantitative agreement with the experiments (see Fig. 1) [1].

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[OIM Talk 3] Noninvasive Diagnosis of Mice Cutaneous Carcinogenesis through Multispectral Imaging {12:00-12:15}

Md. Abdul Wares, Naoki Tobita, Izumi Nishidate, Satoko Kawauchi and Shunichi Sato

To prevent fatal prognosis by early diagnosis, we proposed a method for noninvasive diagnosis of skin cancer. Here, we successfully measured the total hemoglobin concentration and tissue scattering of mice skin during cutaneous two-stage chemical carcinogenesis based on the multispectral diffuse reflectance spectroscopy at isosbestic wavelengths of hemoglobin.

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[OIM Talk 4] High Speed Focimeter to measure the dynamic optical power of tunable lenses {12:15-12:30}

Victor Rodriguez-Lopez, Xoana Barcala, Enrique Gambra, Susana Marcos and Carlos Dorronsoro

Tunable lenses are an emerging technology used in many different optical set-ups and devices. When working at high speed (optical power changes in milliseconds), tunable lenses suffer dynamic effects (deviations and distortions with respect to the driving signal). We present a high-speed focimeter, able to measure the dynamic performance of tunable lenses and to calibrate their responses, providing control of the lens in high speed applications.

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