Article
Chemistry, Analytical
Mario Siciliani de Cumis, Roberto Eramo, Jie Jiang, Martin E. Fermann, Pablo Cancio Pastor
Summary: Accurate isotopic composition analysis of greenhouse gases in the atmosphere is crucial for mitigating global climate change. Optical frequency comb-based spectroscopic techniques, such as direct comb Vernier spectroscopy, have shown promising capabilities for simultaneously monitoring different isotopic species of these gases. By combining interferometric filtering with a high-resolution dispersion spectrometer, this technique can accurately measure the fractional isotopic ratio composition, as demonstrated in this study.
Article
Optics
Yatan Xiong, Jiaqi Zhou, Xinru Cao, Shuzhen Cui, Huawei Jiang, Yan Feng
Summary: This study introduces a high-gain, narrowband, all-polarization-maintaining fiber Brillouin amplifier to address the low power issue of single lines in optical frequency combs (OFCs). Numerical simulations and experiments are conducted to investigate the amplification process for an individual OFC line. The study demonstrates the direct generation of a Watt-level single-mode laser from an OFC, achieving the highest power, signal-to-noise ratio, and side-mode-suppression ratio reported to date.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Analytical
Tingting Zhang, Liyun Wu, Junchang Pei, Xuefeng Li, Haowen Li, Frank Inscore
Summary: In this study, we developed a portable method for detecting caffeine using surface-enhanced Raman spectroscopy (SERS). The results showed that this method has high sensitivity, can detect caffeine at low concentrations, and has good stability and reproducibility.
Article
Nanoscience & Nanotechnology
Lukasz A. Sterczewski, Tzu-Ling Chen, Douglas C. Ober, Charles R. Markus, Chadwick L. Canedy, Igor Vurgaftman, Clifford Frez, Jerry R. Meyer, Mitchio Okumura, Mahmood Bagheri
Summary: Chip-scale optical frequency combs have the potential to be used in broadband spectroscopy and chemical sensing in various fields. By using the Vernier technique, a compact cavity-enhanced chemical sensing system can be realized. The experimental results demonstrate the ability to detect the release of different substances with high resolution and fast response.
Review
Optics
Chuang Lu, Jerome Morville, Lucile Rutkowski, Francisco Senna Vieira, Aleksandra Foltynowicz
Summary: Vernier spectroscopy is a technique that uses optical cavities to filter and enhance the interaction of frequency comb-based technology with the sample, allowing for applications in trace gas detection to precision spectroscopy. It has been implemented using various near- and mid-infrared comb sources.
Article
Chemistry, Physical
D. Michelle Bailey, Eric M. Crump, Joseph T. Hodges, Adam J. Fleisher
Summary: We conducted direct frequency comb spectroscopy on the 2 nu(1) band of (HCN)-C-13 in the short-wave infrared region (lambda = 1.56 mu m) to experimentally validate the molecular line lists used in observatories like JWST. Our laboratory measurements aimed to test spectral reference data generated from accurate potential energy surface (PES) and ab initio dipole moment surface (DMS) calculated using quantum chemistry theory. Comparing theory with experiment will enhance confidence in the interpretation of spectroscopic observations of HCN and HNC in astrophysics and astrochemistry. In this paper, we describe our instrumentation and present initial results obtained using a cross-dispersed spectrometer with a virtually imaged phased array (VIPA).
FARADAY DISCUSSIONS
(2023)
Article
Nanoscience & Nanotechnology
Ahyeon Ma, So Yeon Baek, Jong Hyeok Seo, Syed Asad Abbas, Ji-Hwan Kwon, Sang Jung Ahn, Ki Min Nam
Summary: Noble-metal-decorated metal oxide sensors have shown promising gas-sensing properties, but the optimal dispersion of metal particles on a semiconductor remains challenging. In this study, Co3O4 nanocubes and Pt-supported Co3O4 nanocubes were prepared for acetone gas detection. The Pt-Co3O4 nanocube-based sensor demonstrated higher p-type response and enhanced selectivity toward acetone due to the exposed {100} planes of Co3O4 and incorporated Pt nanoparticles.
ACS APPLIED NANO MATERIALS
(2021)
Article
Optics
Najm M. Al-Hosiny
Summary: We numerically investigate the dynamics of frequency shifts in semiconductor lasers under the injection of a frequency comb. The effect of comb spacing on the locking bandwidth is studied, and it is found to play an important role in the boundaries of the locking bandwidth as well as in the frequency shift of the SL peak.
Article
Acoustics
Hui Zhang, Zhen Wang, Qiang Wang, Simone Borri, Iacopo Galli, Angelo Sampaolo, Pietro Patimisco, Vincenzo Luigi Spagnolo, Paolo De Natale, Wei Ren
Summary: We developed a highly sensitive hydrogen sulfide (H2S) gas sensor using the doubly resonant photoacoustic spectroscopy technique and a near-infrared laser. The sensor achieved a minimum detection limit of 10 part per billion in concentration and a normalized noise equivalent absorption coefficient of 8.9 x 10(-12) W cm(-1) Hz(-1/2) by targeting the R(4) transition of H2S. A laser-cavity-molecule locking strategy was proposed to enhance sensor stability for fast measurement when dealing with external disturbances. A comparison with state-of-the-art H2S sensors using various spectroscopic techniques confirmed the record sensitivity achieved in this work.
Article
Chemistry, Analytical
Boxin Zhang, Xingwei Hou, Cheng Zhen, Alan X. Wang
Summary: The study demonstrated successful detection of synthetic opioid fentanyl in wastewater using SERS technology with ultra-high sensitivity, achieving quantitative analysis through statistical methods. Compared to traditional HPLC-MS technology, SERS technology offers higher sensitivity and portability.
Article
Chemistry, Multidisciplinary
Zachary J. Comeau, Rosemary R. Cranston, Halynne R. Lamontagne, Cory S. Harris, Adam J. Shuhendler, Benoit H. Lessard
Summary: By adjusting factors such as the film morphology and crystal polymorphs, the sensitivity of phthalocyanine-based organic thin-film transistors to THC vapor can be increased.
COMMUNICATIONS CHEMISTRY
(2022)
Article
Optics
Kebin Tong, Zhenhui Du, Jinyi Li, Liming Yuan
Summary: This paper proposes a method using direct injection current multi-frequency modulation (MFM) on a semiconductor laser to generate optical frequency combs (OFCs). The feasibility of this method was demonstrated through a series of experiments, showing that it is simple, flexible, and cost-effective.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Karol Krzempek
Summary: By utilizing a self-fabricated antiresonant hollow core fiber and sensitive gas detection methods, this study demonstrates a novel configuration of a photothermal gas sensor, enabling efficient detection of nitric oxide.
Article
Engineering, Electrical & Electronic
Aritra Paul, Arunabh Deka, Tanooja Mishra, Pradeep Kumar Krishnamurthy
Summary: This paper demonstrates an experimental study on a low-power, broadband, and narrow linewidth SBS-FWM OFC with tunable line spacing of 50 to 600 GHz. The linewidth of the comb lines is reduced to below 20 kHz using the optical Vernier effect. The OFC is utilized to investigate the performance of binary and 4-PAM transmission at different data rates.
IEEE PHOTONICS JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Peng Xing, George Fengrong Chen, Hongwei Gao, Xavier Chia, Anuradha M. Agarwal, Lionel C. Kimerling, Dawn T. H. Tan
Summary: This paper investigates the feasibility of using microresonator frequency combs for high-speed IMDD data transmission and demonstrates its applicability and reliability through experiments. The results show that this technology has the potential to play a significant role in high-speed transmission in data centers.
Article
Optics
Nicola Corrias, Tecla Gabbrielli, Paolo de Natale, Luigi Consolino, Francesco Cappelli
Summary: This article demonstrates the applicability of quantum cascade laser frequency combs in free-space optical communication. The analog signal is transferred using the spontaneously-generated intermodal beat note of the frequency comb as the carrier for frequency modulation. It also showcases the potential for parallel transmission of independent digital signals through amplitude modulation.
Article
Materials Science, Multidisciplinary
Yuchen Wang, Toney T. Fernandez, Pinghua Tang, Nicola Coluccelli, Stuart D. Jackson, Mario C. Falconi, Francesco Prudenzano, Paolo Laporta, Gianluca Galzerano
Summary: This study comprehensively characterizes the tunable continuous-wave and passive Q-switching laser performance of Dy-doped zirconium fluoride fiber emitting at around 3 μm. The optimal pump wavelengths, fiber lengths, output coupling efficiencies, and cavity parameters are determined, leading to high laser slope efficiency and a wide tuning range. Passively Q-switched laser operation is achieved using a semiconductor saturable absorber mirror, demonstrating stable operation and high pulse energy.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Engineering, Electrical & Electronic
Pinghua Tang, Yuchen Wang, Edoardo Vicentini, Francesco Canella, Lisa Marta Molteni, Nicola Coluccelli, Paolo Laporta, Gianluca Galzerano
Summary: We present a handheld Dy-doped ZBLAN fiber laser that can be pumped by hand, with tunable emission wavelength in the mid-IR range and capable of single-frequency operation. By utilizing an intracavity germanium etalon and a reflective diffraction grating, we achieved single-frequency operation with emission linewidth narrower than 110 kHz and relative intensity fluctuations at a level of 0.9% over a wide integration bandwidth.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Davide Gatti, Marco Lamperti, Attilio Zilli, Francesco Canella, Giulio Cerullo, Gianluca Galzerano, Paolo Laporta, Nicola Coluccelli
Summary: A laser system is introduced for standoff coherent anti-Stokes Raman scattering (CARS) spectroscopy under ambient light conditions. The system allows for high-resolution Raman spectra and hyperspectral imaging.
Article
Optics
Roberto Aiello, Valentina Di Sarno, Maria Giulia Delli Santi, Maurizio De Rosa, Iolanda Ricciardi, Giovanni Giusfredi, Paolo De Natale, Luigi Santamaria, Pasquale Maddaloni
Summary: This study introduces a high-detection-sensitivity saturated-absorption cavity ring-down (SCAR) technique for Lamb-dip spectroscopy of rovibrational molecular transitions in the near-infrared region. The analysis of acetylene spectra at 6562 cm(-1) is based on a specially developed theoretical model, resulting in a 40% reduction in linewidth and a 90% increase in signal-to-noise ratio compared to conventional methods, ultimately achieving a low uncertainty for absolute line-center frequency and relative line strength measurements.
PHOTONICS RESEARCH
(2022)
Article
Optics
Elisa Riccardi, Valentino Pistore, Luigi Consolino, Alessia Sorgi, Francesco Cappelli, Roberto Eramo, Paolo De Natale, Lianhe Li, Alexander Giles Davies, Edmund H. Linfield, Miriam S. Vitiello
Summary: In this paper, a technological method for achieving broad FC operation across the entire THz frequency range is proposed, using multistack quantum cascade lasers and multilayer graphene films. The experimental characterization of the QCL FC confirms its metrological nature.
LASER & PHOTONICS REVIEWS
(2023)
Article
Acoustics
Hui Zhang, Zhen Wang, Qiang Wang, Simone Borri, Iacopo Galli, Angelo Sampaolo, Pietro Patimisco, Vincenzo Luigi Spagnolo, Paolo De Natale, Wei Ren
Summary: We developed a highly sensitive hydrogen sulfide (H2S) gas sensor using the doubly resonant photoacoustic spectroscopy technique and a near-infrared laser. The sensor achieved a minimum detection limit of 10 part per billion in concentration and a normalized noise equivalent absorption coefficient of 8.9 x 10(-12) W cm(-1) Hz(-1/2) by targeting the R(4) transition of H2S. A laser-cavity-molecule locking strategy was proposed to enhance sensor stability for fast measurement when dealing with external disturbances. A comparison with state-of-the-art H2S sensors using various spectroscopic techniques confirmed the record sensitivity achieved in this work.
Article
Optics
B. Chomet, T. Gabbrielli, D. Gacemi, F. Cappelli, L. Consolino, P. De Natale, F. Kapsalidis, A. Vasanelli, Y. Todorov, J. Faist, C. Sirtori
Summary: In quantum cascade laser frequency combs, the intensity distribution of the optical spectrum can be split into two well-separated lobes of longitudinal modes that, even when far apart, have a common phase relation and preserve equal frequency separation. The temporal dynamics of two lasers emitting at 4.4 and 8.1 mu m operating in this bilobed regime are investigated. The laser intensity shows a peculiar temporal behavior associated with the spectral features whereby, every half a round-trip, the total emitted power switches from one lobe to the other, with a perfect temporal anti-correlation.
Article
Quantum Science & Technology
Domenico Ribezzo, Mujtaba Zahidy, Ilaria Vagniluca, Nicola Biagi, Saverio Francesconi, Tommaso Occhipinti, Leif K. Oxenlowe, Martin Loncaric, Ivan Cvitic, Mario Stipcevic, Ziga Pusavec, Rainer Kaltenbaek, Anton Ramsak, Francesco Scazza, Giorgio Giorgetti, Francesco Scazza, Angelo Bassi, Paolo De Natale, Francesco Saverio Cataliotti, Massimo Inguscio, Davide Bacco, Alessandro Zavatta
Summary: It has been around 40 years since the possibility of using quantum physics to enhance communications safety was introduced. Nowadays, quantum key distribution (QKD) has become a mature technology, drawing the attention of various entities, including states, military forces, banks, and private corporations. This work successfully deploys QKD on consumer technology by utilizing deployed optical fibers to create a quantum network connecting three different countries. The experimental results, along with the interest from an important international political event, highlight the maturity of QKD technology, making it a potential candidate for consumer applications in the near future.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Materials Science, Multidisciplinary
Tecla Gabbrielli, Natalia Bruno, Nicola Corrias, Simone Borri, Luigi Consolino, Mathieu Bertrand, Mehran Shahmohammadi, Martin Franckie, Mattias Beck, Jerome Faist, Alessandro Zavatta, Francesco Cappelli, Paolo De Natale
Summary: This study presents a novel approach to investigate harmonic frequency combs emitted by quantum cascade lasers (QCLs), revealing the presence of intensity correlations among the twin modes characterizing the emission spectra. The findings hold significance for engineering a new generation of semiconductor devices that can emit light with quantum properties.
ADVANCED PHOTONICS RESEARCH
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Nicole Fabbri, Paolo De Natale, Francesco S. Cataliotti
Summary: Quantum sensing technologies have the potential to revolutionize defence capabilities by surpassing the limitations of classical sensing and improving the detection, recognition, identification, and tracking of difficult targets.
2022 23RD INTERNATIONAL RADAR SYMPOSIUM (IRS)
(2022)
Review
Quantum Science & Technology
Miriam Serena Vitiello, Paolo De Natale
Summary: Quantum cascade lasers (QCLs) demonstrate the generation of artificial materials with tailor-made properties through quantum design, featuring intrinsic linewidths near the quantum limit and spontaneous phase-locking. Operating at terahertz frequencies, QCLs show important technological performances and have promising future prospects in the field of quantum technologies.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
