Dr. Nikola Opacak Profile

Dr. Nikola Opacak

at Technische Univ Wien

SPIE Involvement:

Author

Publications (21)

Proceedings Article | 13 March 2024 Presentation + Paper

Presentation + Paper

Liquid sensing on the chip-scale: towards complex mid-IR photonic integrated circuits (PICs)

Borislav Hinkov, Mauro David, Georg Marschick, Andreas Schwaighofer, Nikola Opacak, Salvatore Pes, Axel Evirgen, Benedikt Schwarz, Bernhard Lendl, Gottfried Strasser

Proceedings Volume 12912, 1291215 (2024) https://doi.org/10.1117/12.3011747

KEYWORDS: Mid infrared, Photonic integrated circuits, Liquids, Quantum cascade lasers, Sensors, Lab on a chip, Waveguides, Quantum sensing, Plasmonic waveguides, Germanium

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Proceedings Article | 13 March 2024 Presentation

Presentation

Bright-dark solitons in a hybridized frequency comb

Theodore Letsou, Dmitry Kazakov, Pawan Ratra, Lorenzo Columbo, Sandro Dal Cin, Nikola Opacak, Marco Piccardo, Benedikt Schwarz, Federico Capasso

Proceedings Volume PC12905, PC1290509 (2024) https://doi.org/10.1117/12.3016806

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Proceedings Article | 13 March 2024 Presentation

Presentation

Nonlinear mid-infrared photonics with active resonators

Dmitry Kazakov, Theodore Letsou, Pawan Ratra, Marco Piccardo, Lorenzo Columbo, Massimo Brambilla, Franco Prati, Sandro Dal Cin, Maximillian Beiser, Nikola Opacak, Michael Pushkarsky, David Caffey, Timothy Day, Luigi Lugiato, Benedikt Schwarz, Federico Capasso

Proceedings Volume PC12905, PC1290508 (2024) https://doi.org/10.1117/12.3003043

KEYWORDS: Mid-IR, Photonics, Tunable filters, Solitons, Semiconductors, Phase shifts, Optical resonators, Nonlinear optics, Nonlinear filtering, Resonators

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Proceedings Article | 9 March 2024 Presentation

Presentation

Nozaki-Bekki optical solitons

Benedikt Schwarz, Nikola Opacak, Dmitry Kazakov, Lorenzo Columbo, Maximillian Beiser, Theodore Letsou, Florian Pilat, Massimo Brambilla, Franco Prati, Marco Piccardo, Federico Capasso

Proceedings Volume PC12895, PC128950M (2024) https://doi.org/10.1117/12.3003819

KEYWORDS: Optical solitons, Solitons, Semiconductor lasers, Quantum cascade lasers, Microresonators, Spectroscopy, Quantum systems, Quantum signals, Quantum sensing, Quantum optics applications

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Proceedings Article | 17 March 2023 Presentation

Presentation

Merging mid-IR QC technology with plasmonic interconnects: a monolithically integrated mid-infrared heterodyne receiver

Mauro David, Georg Marschick, Elena Arigliani, Nikola Opacak, Dominik Koukola, Benedikt Schwarz, Gottfried Strasser, Borislav Hinkov

Proceedings Volume PC12424, PC124240R (2023) https://doi.org/10.1117/12.2650062

KEYWORDS: Mid-IR, Heterodyning, Receivers, Long wavelength infrared, Plasmonics, Photonic integrated circuits, Quantum cascade lasers, Plasmonic waveguides, Signal attenuation, Sensors

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Proceedings Article | 17 March 2023 Presentation

Presentation

Ring quantum cascade lasers as versatile photonic components for the mid-infrared

Dmitry Kazakov, Theodore Letsou, Nikola Opačak, Maximillian Beiser, Sandro Dal Cin, Lorenzo Columbo, Massimo Brambilla, Franco Prati, Luigi Lugiato, Marco Piccardo, Benedikt Schwarz, Federico Capasso

Proceedings Volume PC12440, PC124400I (2023) https://doi.org/10.1117/12.2647068

KEYWORDS: Quantum cascade lasers, Mid-IR, Molecular spectroscopy, Wavelength division multiplexing, Tunable filters, Transceivers, Spectroscopy, Spectrometers, Optical amplifiers, Molecular photonics

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Proceedings Article | 17 March 2023 Presentation

Presentation

Terahertz quantum cascade ring lasers: comb operation and integration on Si-substrates

M. Jaidl, N. Opačak, M. Kainz, M. Ertl, D. Theiner, B. Limbacher, M. Beiser, M. Giparakis, M. Andrews, G. Strasser, B. Schwarz, J. Darmo, K. Unterrainer

Proceedings Volume PC12440, PC124400Q (2023) https://doi.org/10.1117/12.2648329

KEYWORDS: Quantum cascade lasers, Terahertz radiation, Silicon, Resonators, Frequency combs, Waveguides, Phonons, Nonlinear optics, Laser damage threshold, Integrated optics

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Proceedings Article | 17 March 2023 Presentation

Presentation

Quantum cascade laser frequency combs induced by a giant Kerr nonlinearity

B. Schwarz, N. Opacak, F. Pilat, D. Kazakov, S. Dal Cin, M. Beiser, L. Columbo, J. Hillbrand, M. Piccardo, F. Capasso

Proceedings Volume PC12440, PC124400F (2023) https://doi.org/10.1117/12.2651688

KEYWORDS: Quantum cascade lasers, Frequency combs, Semiconductor lasers, Nonlinear optics

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Proceedings Article | 17 March 2023 Presentation

Presentation

Parametric processes and nonlinear dynamics of self-starting frequency combs

Nikola Opačak, Dmitry Kazakov, Lorenzo Columbo, Maximilian Beiser, Florian Pilat, Massimo Brambilla, Franco Prati, Marco Piccardo, Federico Capasso, Benedikt Schwarz

Proceedings Volume PC12440, PC124400G (2023) https://doi.org/10.1117/12.2651256

KEYWORDS: Frequency combs, Nonlinear dynamics, Semiconductor lasers, Quantum cascade lasers, Fluorescence correlation spectroscopy, Spectroscopy, Mode locking, Microresonators, Laser applications, Fabry–Perot interferometers

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Proceedings Article | 17 March 2023 Presentation

Presentation

Solitary structures and optical frequency combs in a ring quantum cascade laser

Lorenzo Luigi Columbo, Massimo Brambilla, Franco Prati, Nikola Opacak, Dmitry Kazakov, Marco Piccardo, Benedikt Schwarz, Luigi Lugiato, Federico Capasso

Proceedings Volume PC12440, PC124400J (2023) https://doi.org/10.1117/12.2650677

KEYWORDS: Quantum cascade lasers, Frequency combs, Wireless communications, Spectroscopy, Solitons

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Proceedings Article | 30 May 2022 Presentation

Presentation

Dissipative solitons and frequency combs in a ring quantum cascade laser

Lorenzo Luigi Columbo, Marco Piccardo, Franco Prati, Luigi Lugiato, Massimo Brambilla, Alessandra Gatti, Carlo Silvestri, Mariangela Gioannini, Nikola Opacak, Benedikt Schwarz, Federico Capasso

Proceedings Volume PC12143, PC121430I (2022) https://doi.org/10.1117/12.2631339

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Proceedings Article | 25 May 2022 Presentation

Presentation

The relevance of valence band engineering in interband cascade lasers

Hedwig Knötig, Rolf Szedlak, Josephine Nauschütz, Robert Weih, Nikola Opačak, Sven Höfling, Johannes Koeth, Gottfried Strasser, Benedikt Schwarz

Proceedings Volume PC12141, PC121410I (2022) https://doi.org/10.1117/12.2621976

KEYWORDS: Absorption, Quantum cascade lasers, Quantum wells, Continuous wave operation, Sensing systems, Polarization, Physics, Photonics, Mid-IR, Laser sources

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Proceedings Article | 25 May 2022 Presentation

Presentation

The linewidth enhancement factor of a semiconductor frequency comb: a spectrally-resolved measurement technique

Florian Pilat, Nikola Opačak, Dmitry Kazakov, Sandro Dal Cin, Federico Capasso, Gottfried Strasser, Benedikt Schwarz

Proceedings Volume PC12141, PC121410C (2022) https://doi.org/10.1117/12.2621511

KEYWORDS: Frequency combs, Semiconductors, Modulation, Semiconductor lasers, FT-IR spectroscopy, Surgery, Spectroscopy, Quantum well infrared photodetectors, Quantum cascade lasers, Phase shift keying

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Semiconductor lasers are compact, electrically pumped sources of coherent light. If designed properly they emit frequency combs, which nowadays find application in various areas such as telecommunications, metrology and high-precision spectroscopy for chemical sensing and medical diagnostics. Laser design and optimization require profound knowledge of the working principles at play and powerful techniques to infer their characteristics. One of these characteristic quantities is the linewidth enhancement factor (LEF). It originates from a theoretical description of the linewidth broadening beyond the Shawlow-Townes-limit, but is recently moving in the spotlight of frequency comb research to understand dynamic processes like modulation response, comb formation and even soliton generation. However, as of yet the experimental investigation of the LEF was limited to single-mode laser operation or measurements below to the lasing threshold. This is insufficient, since the LEF changes drastically with the laser bias and is dependent on the wavelength. In this work we present a novel technique which enables the spectrally-resolved measurement of the LEF of an arbitrary laser source regardless of the operation state or bias. It relies on the RF modulation of the driving bias and “Shifted Wave Interference Fourier Transform Spectroscopy” (SWIFTS) – a phase-sensitive measurement scheme. When investigating a laser frequency comb, a single-shot measurement reveals the spectral dependence of the LEF over the whole comb spectrum. Extensive simulations utilizing a numerical spatiotemporal model based on the Maxwell–Bloch formalism were performed to explore the success of this approach. The technique was vastly tested by simulating both, single-mode lasers and laser frequency combs. A comparison to the theoretical model shows good agreement. The experimental demonstration of the technique is performed on a quantum cascade laser (QCL) frequency comb. The resulting LEF values are comparable to recent publications and follow the spectral shape predicted by the theoretical model.

Proceedings Article | 24 May 2022 Presentation

Presentation

Frequency comb operation induced by a giant Kerr nonlinearity in quantum cascade lasers

Benedikt Schwarz, Nikola Opacak, Florian Pilat, Dmitry Kazakov, Sandro Dal Cin, Maximilian Beiser, Lorenzo Columbo, Johannes Hillbrand, Marco Piccardo, Federico Capasso

Proceedings Volume PC12131, PC121310C (2022) https://doi.org/10.1117/12.2621685

KEYWORDS: Quantum cascade lasers, Frequency combs, Ultrafast phenomena, Turbulence, Spectroscopy, Solitons, Semiconductor lasers, Nonlinear optics

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Proceedings Article | 9 March 2022 Presentation

Presentation

Frequency combs in ring quantum cascade lasers

Dmitry Kazakov, Maximilian Beiser, Nikola Opacak, Yiyang Zhi, Massimo Brambilla, Lorenzo Columbo, Benedikt Schwarz, Alexey Belyanin, Marco Piccardo, Federico Capasso

Proceedings Volume PC12021, PC1202108 (2022) https://doi.org/10.1117/12.2609111

KEYWORDS: Quantum cascade lasers, Frequency combs, Solitons, Resonators

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Proceedings Article | 9 March 2022 Presentation

Presentation

Quantum cascade detectors: A 9-µm device optimized for low-attenuation free-space optical communication

Georg Marschick, Mauro David, Alexandre Delga, Nikola Opacak, Benedikt Schwarz, Mathurin Lagree, Thomas Poletti, Axel Evirgen, Bruno Gerard, Gottfried Strasser, Borislav Hinkov

Proceedings Volume PC12021, PC120210K (2022) https://doi.org/10.1117/12.2609902

KEYWORDS: Sensors, Quantum communications, Free space optical communications, Quantum cascade lasers, Long wavelength infrared, Telecommunications, Ranging, Quantum chromodynamics, Neodymium, Modulation

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Proceedings Article | 5 March 2021 Presentation

Presentation

Origin of the linewidth enhancement factor: Resonant processes behind optical frequency comb formation

Nikola Opacak, Sandro Dal Cin, Johannes Hillbrand, Gottfried Strasser, Benedikt Schwarz

Proceedings Volume 11705, 1170511 (2021) https://doi.org/10.1117/12.2577796

KEYWORDS: Frequency combs, Quantum cascade lasers, Scattering, Laser scattering, Turbulence, Semiconductor lasers, Microresonators, Kerr effect, Dispersion

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Proceedings Article | 5 March 2021 Presentation

Presentation

Mid-infrared frequency combs based on semiconductor lasers

Benedikt Schwarz, Maximilian Beiser, Sandro Dal Cin, Johannes Hillbrand, Nikola Opacak, Gottfried Strasser, Harald Schneider, Marco Piccardo, Federico Capasso, Robert Weih

Proceedings Volume 11705, 117050S (2021) https://doi.org/10.1117/12.2582492

KEYWORDS: Frequency combs, Semiconductor lasers, Mid-IR, Quantum cascade lasers, Spectrometers, Picosecond phenomena, Modulators, Modulation, Integrated photonics, Integrated optics

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Proceedings Article | 5 March 2021 Presentation

Presentation

Frequency combs and temporal solitons in a coherently driven ring quantum cascade laser

Lorenzo Columbo, Franco Prati, Luigi Lugiato, Alessandra Gatti, Mariangela Gioannini, Carlo Silvestri, Benedikt Schwarz, Nikola Opacak, Marco Piccardo, Federico Capasso, Massimo Brambilla

Proceedings Volume 11705, 117050Y (2021) https://doi.org/10.1117/12.2578431

KEYWORDS: Quantum cascade lasers, Solitons, Frequency combs, Microresonators, Turbulence, Physics, Optical resonators

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Proceedings Article | 5 March 2021 Presentation

Presentation

Manipulating frequency comb regimes in semiconductor ring lasers

Dmitry Kazakov, Marco Piccardo, Benedikt Schwarz, Nikola Opacak, Maximilian Beiser, Yongrui Wang, Shantanu Jha, Michele Tamagnone, Johannes Hillbrand, Lorenzo Columbo, Alexey Belyanin, Federico Capasso

Proceedings Volume 11705, 117050R (2021) https://doi.org/10.1117/12.2577301

KEYWORDS: Semiconductor lasers, Frequency combs, Semiconductors, Quantum cascade lasers, Hole burning spectroscopy

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Proceedings Article | 9 March 2020 Presentation

Presentation

Understanding frequency-modulated combs (Conference Presentation)

Benedikt Schwarz, Nikola Opacak

Proceedings Volume 11301, 1130117 (2020) https://doi.org/10.1117/12.2546508

KEYWORDS: Modulation, Fermium, Frequency modulation, Quantum cascade lasers, Frequency combs, Quantum wells, Quantum dot lasers

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Showing 5 of 21 publications

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