Article
Chemistry, Multidisciplinary
Niclas S. Mueller, Emanuel Pfitzner, Yu Okamura, Georgy Gordeev, Patryk Kusch, Holger Lange, Joachim Heberle, Florian Schulz, Stephanie Reich
Summary: Research shows that plasmonic supercrystals, with a high density of hotspots, are an excellent platform for enhancing vibrational spectra by increasing the cross section of Raman scattering and infrared absorption. The study demonstrates that the intensity of surface-enhanced Raman scattering inside the crystal is uniform and predictable, with supercrystal polaritons inducing resonances in the enhanced cross section for both Raman scattering and infrared absorption. The enhancement of infrared absorption within supercrystals is attributed to the combined effects of hotspot formation and the excitation of standing polariton waves.
Article
Chemistry, Physical
Inyong Hwang, Mingyun Kim, Jaeyeon Yu, Jihye Lee, Jun-Hyuk Choi, Su A. Park, Won Seok Chang, Jongwon Lee, Joo-Yun Jung
Summary: SEIRA spectroscopy utilizes near-field effects in nanostructures for highly sensitive detection, with a 10 nm thick MA achieving a record-high reflection difference SEIRA signal in experiments. MAs can be mass-produced through nanoimprint lithography and dry etching, offering a promising technological pathway for sensing and detection applications.
Article
Chemistry, Multidisciplinary
Guangyan Huang, Kaizhen Liu, Guangyi Shi, Qianqian Guo, Xiang Li, Zeke Liu, Wanli Ma, Tao Wang
Summary: Plasmonic nanocavities have the ability to concentrate light, but at small cavity sizes, quenching occurs due to quantum mechanical effects. However, our study shows that quantum effects can enhance the absorption of molecules, thereby increasing the sensitivity of nanocavities.
Article
Chemistry, Multidisciplinary
Chenchen Wu, Xiangdong Guo, Yu Duan, Wei Lyu, Hai Hu, Debo Hu, Ke Chen, Zhipei Sun, Teng Gao, Xiaoxia Yang, Qing Dai
Summary: In this study, a tunable infrared transparent microfluidic system with graphene plasmons was developed to identify nanoscale proteins. By adjusting the system's transparency, the infrared absorption of water was eliminated, allowing for accurate measurements of the proteins. This study provides a new platform for studying biological processes.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Lip Ket Chin, Jun-Yeong Yang, Benjamin Chousterman, Sunghoon Jung, Do-Geun Kim, Dong-Ho Kim, Seunghun Lee, Cesar M. Castro, Ralph Weissleder, Sung-Gyu Park, Hyungsoon Im
Summary: In this study, an ultrasensitive multiplexed plasmonic sensing technology was developed for rapid quantification of multiple biomarkers in point-of-care settings, which could improve the diagnosis and management of sepsis. The technology integrated chemifluorescence signal enhancement with plasmon-enhanced fluorescence detection, allowing for rapid analysis of cytokine biomarkers with high sensitivity. A plasmonic sensing chip based on nanoparticle-spiked gold nanodimple structures was also developed for direct detection of cytokines in clinical plasma samples.
Article
Chemistry, Multidisciplinary
Meitong Nie, Yuming Zhao, Wonil Nam, Junyeob Song, Wenqi Zhu, Henri J. Lezec, Amit Agrawal, Wei Zhou
Summary: The research introduces nanolaminate plasmonic nanocavities on 3D vertical nanopillar arrays for broadband SERS operation with large enhancement factors. It shows uniform SERS performance and demonstrates nanoscale broadband SERS operation at the single MIM nanocavity level. Numerical studies reveal that the nanolaminate plasmonic nanocavities can support multiple hybridized plasmonic modes for concentrating optical fields across a broadband wavelength range.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Review
Instruments & Instrumentation
Donglai An, Fangyuan Sun, Yupei Bian, Jing Ni, Qi Jie Wang, Xia Yu
Summary: Mid-infrared absorption spectroscopy is a powerful tool for measuring and analyzing the composition, concentration, and structure of substance molecules. It is widely used in the biomedical field for noninvasive, label-free, and real-time analysis and diagnosis. This study reviews various enhancement technologies for mid-infrared absorption spectroscopy and their applications in breath analysis, body fluid detection, protein structure and conformational transition, and food and drug quality monitoring.
APPLIED SPECTROSCOPY REVIEWS
(2022)
Article
Chemistry, Multidisciplinary
Samir Rosas, Keegan A. Schoeller, Edward Chang, Hongyan Mei, Mikhail A. Kats, Kevin W. Eliceiri, Xinyu Zhao, Filiz Yesilkoy
Summary: Label-free and nondestructive mid-infrared vibrational hyperspectral imaging is an important tissue analysis tool that provides spatially resolved biochemical information. This study introduces an advanced mid-infrared spectrochemical tissue imaging modality using metasurfaces to capture quantitative molecular maps of large-area murine brain tissue sections. The results demonstrate that plasmonic metasurfaces enhance chemical contrast in infrared images and enable the detection of ultrathin tissue regions. This imaging method has the potential to have a broad impact on translational research and clinical histopathology.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Ehab Awad
Summary: Graphene is a promising material for infrared applications, but standalone monolayer graphene has low infrared absorption. In this study, a novel graphene metamaterial embedded inside a Bundt optical-antenna is introduced, which significantly enhances the infrared absorption of graphene and covers a wide range of optical communication bands.
Review
Optics
Hai-Long Wang, En-Ming You, Rajapandiyan Panneerselvam, Song-Yuan Ding, Zhong-Qun Tian
Summary: Raman and infrared spectroscopy have low detection sensitivity, but advancements have been made through the development of optical systems, nanostructure-based techniques, and their coupling for maximizing detection sensitivity. Plasmonics, interactions with nano/microstructures, and coupling effects have been studied to increase surface sensitivity. The focus is on systematically designing macro-optical systems to maximize excitation efficiency and detection sensitivity, with advancements in scanning-probe microscopy-based nanoscale spectroscopy. Prospects include emerging techniques and methodologies for further developments in the field.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Chemistry, Analytical
Hao Wu, Yangxi Zhang, Zhi-Zheng Wang, A. Ping Zhang
Summary: Infrared absorption-spectroscopy (IRAS) is a useful tool for identifying and characterizing molecular species. Plasmonic substrates have greatly enhanced the performance of IRAS technology for high-sensitivity biochemical detection, but their fabrication is still challenging and costly. This study presents a precision photoreduction and replacement reaction combined technology to directly print plasmonic substrates for PEIRAS biodetection. Experimental results show that the printed plasmonic substrate can detect bovine serum albumin at a concentration level of 10 nM, indicating its promising application in IRAS biodetection.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Multidisciplinary
Hao Chen, Gaurav Singhal, Frank Neubrech, Runyu Liu, Joshua S. Katz, Scott Matteucci, Steven G. Arturo, Daniel Wasserman, Harald Giessen, Paul Braun
Summary: This study demonstrates a method using plasmonic nanoantenna-based surface enhanced infrared absorption (SEIRA) to characterize molecular transport in polymers with good temporal and high spatial resolution. This method enables quantitative detection of trace quantities of compounds in thin films and diffusion measurements. The performance in terms of detection limit and detection volume is significantly improved compared to commercial systems.
Article
Engineering, Electrical & Electronic
Rashmi Kumari, Shubhanshi Sharma, Shailendra Kumar Varshney, Basudev Lahiri
Summary: In this paper, a van der Waals heterostructure-based optical metasurface was theoretically investigated for dual-band optical biosensing. The proposed structure consists of two gratings, allowing refractive index sensing in the visible and vibrational fingerprint detection in the mid-infrared region simultaneously. The sensor has the potential to be used in next-generation medical applications and environmental monitoring.
IEEE SENSORS JOURNAL
(2022)
Article
Biophysics
Tianping Xu, Zhaoxin Geng
Summary: Due to the lower sensitivity of LSPR biosensors compared to other sensors, researchers have explored various methods to improve performance, including structural, material, and interface modifications. These efforts are expected to expand the applications of LSPR biosensing technology.
BIOSENSORS & BIOELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Hajir Hilal, Mohammadnavid Haddadnezhad, Myeong Jin Oh, Insub Jung, Sungho Park
Summary: Elongated pseudohollow nanoframes composed of four rectangular plates enclosing the sides and two open-frame ends with four ridges pointing at the tips for near-field focusing are reported. The nanoframes are hollow inside, allowing the gaseous analyte to penetrate through the entire architecture and enabling efficient detection of gaseous analytes when combined with Raman spectroscopy. The significant enhancement in SERS is attributed to the presence of a flat solid terrace for a large surface area, sharp edges and vertices for strong electromagnetic near-field collection, and open frames for effective analyte transport and capture.
Article
Optics
Abdullah Alabbadi, Tobias Steinle, Harald Giessen
Summary: We present a compact and passively stable optical parametric oscillator that can directly generate sub-40 fs pulses, five times shorter than the 200 fs pump oscillator. By utilizing an intracavity all normal dispersion feedback fiber, we have achieved low-noise and coherent broadening beyond the bandwidth limitation of the parametric gain. The demonstrated spectral coverage ranges from 1.1 to 2.0 μm with excellent passive power and spectral stability below 0.1% rms, all in a compact footprint smaller than 14x14 cm(2).
Article
Chemistry, Multidisciplinary
Jiawen Li, Simon Thiele, Rodney W. Kirk, Bryden C. Quirk, Ayla Hoogendoorn, Yung Chih Chen, Karlheinz Peter, Stephen J. Nicholls, Johan W. Verjans, Peter J. Psaltis, Christina Bursill, Alois M. Herkommer, Harald Giessen, Robert A. McLaughlin
Summary: Multimodal microendoscopes enable simultaneous structural and molecular measurements in vivo, providing valuable insights into pathological changes associated with diseases. However, different optical imaging modalities have conflicting requirements for lens design, posing a challenge for the fabrication of miniaturized imaging probes. This study demonstrates an optical design using two-photon 3D printing to create a miniaturized lens that is optimized for both fluorescence and optical coherence tomography (OCT) imaging. The lens-in-lens design shows significant improvement in fluorescence sensitivity compared to conventional fiber-optic design approaches, and is successfully integrated into an intravascular catheter probe for simultaneous OCT and fluorescence imaging of a mouse artery in vivo.
Article
Materials Science, Multidisciplinary
Simon Ristok, Philipp Flad, Harald Giessen
Summary: 3D printing of micro-optics is a powerful method for fabricating sub-millimeter sized optics. By utilizing conformal low-temperature thermal atomic layer deposition, we are able to overcome the limitation of coating individual lenses in 3D printed optical systems. Our 4-layer design reduces the reflectivity of coated substrates in the visible range to below 1%. We find that the reflectivity is significantly reduced and transmission is enhanced, which is particularly important for low-light applications.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Materials Science, Multidisciplinary
Philipp Karl, Sandra Mennle, Monika Ubl, Mario Hentschel, Philipp Flad, Jing-Wei Yang, Tzu-Yu Peng, Yu-Jung Lu, Harald Giessen
Summary: The development of photon-based technologies such as quantum cryptography and quantum computing relies on high-fidelity and fast photodetectors capable of detecting single photons. Superconducting nanowire single photon detectors, utilizing the superconducting-to-normal conducting phase transition, offer a promising solution. Using resonant plasmonic perfect absorber effects, these detectors can achieve high efficiency, polarization-independent absorption at a specific wavelength. Additionally, the target wavelength can be easily adjusted by modifying the detector's geometry.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Chemistry, Multidisciplinary
Hongfeng Ma, Nicolas Dalloz, Amaury Habrard, Marc Sebban, Florian Sterl, Harald Giessen, Mathieu Hebert, Nathalie Destouches
Summary: This article explores the use of deep neural networks and laser processing technology to predict the optical properties of laser-induced plasmonic metasurfaces and achieve printing image multiplexing. The study validates the effectiveness of the deep learning approach and provides a simple mining algorithm for implementing multiplexing with multiple observation modes and colors. This research is important for optimizing laser processes in high-end applications such as security, entertainment, or data storage.
Article
Optics
Julian Schwab, Ksenia Weber, Johannes Drozella, Carlos Jimenez, Alois Herkommer, Lucas Bremer, Stephan Reitzenstein, Harald Giessen
Summary: This study discusses the coupling efficiency of single-photon sources into single-mode fibers using 3D printed micro-optical lens designs. It optimizes lens systems for two different quantum light sources and evaluates the results in terms of maximum coupling efficiencies, misalignment effects, and thermo-optical influences.
Article
Chemistry, Analytical
Diana Pfezer, Julian Karst, Mario Hentschel, Harald Giessen
Summary: The detection and quantification of glucose in human blood or ocular fluid is crucial for diabetes patients. In this study, plasmonic nanoantennas and PCA were used to enhance the detection of glucose and other saccharides in complex aqueous environments. The results showed that the sensor achieved reliable detection and discrimination of saccharide concentrations down to physiological levels, which will greatly improve the detection of biomolecules in different complex environments.
Article
Chemistry, Multidisciplinary
Nabarun Polley, Samim Sardar, Peter Werner, Ingo Gersonde, Yuya Kanehira, Ilko Bald, Daniel Repp, Thomas Pertsch, Claudia Pacholski
Summary: In this research, optical fibers equipped with plasmonic flow sensors were fabricated as photothermomechanical nanopumps for active transport of target analytes. The nanopumps were prepared by stacking a thermoresponsive polymer monolayer and a plasmonic nanohole array on an optical fiber tip. The pump mechanism relied on the temperature-dependent collapse and swelling of the polymer, while the required heat was generated by the photo thermal effect in the plasmonic nanohole array. Simultaneous detection of analytes was achieved by monitoring changes in the plasmonic sensor's optical response. The active mass transport through the nanohole array was visualized using particle imaging velocimetry. The presence of the pump mechanism led to a 4-fold increase in sensitivity compared to the purely photothermal effect, demonstrating the potential of these photothermomechanical nanopumps for sensing applications.
Article
Optics
Mario Hentschel, Kirill Koshelev, Florian Sterl, Steffen Both, Julian Karst, Lida Shamsafar, Thomas Weiss, Yuri Kivshar, Harald Giessen
Summary: Manipulating light on the nanoscale requires resonant light confinement, which is often restricted by the dispersion and loss of metals and dielectrics. However, this study presents a novel strategy for dielectric nanophotonics by achieving resonant subwavelength localized confinement of light in air. The experiments demonstrate the exceptional optical properties of voids created in high-index dielectric host materials, which offer bright and intense colors for nanoscale color printing and expand the parameter space for the design of metasurfaces and other micro- and nanoscale optical elements.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Ruth Fabiola Balderas-Valadez, Alessandro Nagel, Yuya Kanehira, Ilko Bald, Claudia Pacholski
Summary: The homogeneous and ordered coverage of substrate surfaces with nanostructures is achieved by using colloidal arrays, which allows for the fabrication of highly ordered nanostructure arrays on large areas.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Physics, Multidisciplinary
Masoud Taleb, Mario Hentschel, Kai Rossnagel, Harald Giessen, Nahid Talebi
Summary: Ultrafast photon-electron spectroscopy in electron microscopes commonly requires ultrafast laser setups. Now, an inverse approach based on cathodoluminescence spectroscopy has allowed a compact solution to spectral interferometry inside an electron microscope, without a laser.
Review
Materials Science, Multidisciplinary
Biswajit Bhattacharyya, Christian Balischewski, Claudia Pacholski, Anshu Pandey, Ilko Bald, Andreas Taubert
Summary: This review discusses the research and technological advancements of CuFeS2 nanocrystals as a promising alternative to indium-based I-III-VI2 semiconductor nanocrystals. CuFeS2 has many desirable properties and the abundance of iron compared to indium alleviates the issue of raw material availability. The article highlights new synthesis approaches and summarizes advanced optical properties, as well as potential applications in various fields.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Yang Luo, Alberto Martin-Jimenez, Frank Neubrech, Na Liu, Manish Garg
Summary: This research successfully demonstrates the generation and direct sampling of ultra-broadband infrared laser pulses at a high repetition rate (about 80 MHz) with stable carrier-envelope phase, possessing a spectral bandwidth of 1.1 octaves. By performing electron tunneling current measurements on a chip, the electric field of the laser pulses can be sampled in an ultra-broadband manner. This result paves the way for broad applications in near-field ultrafast spectroscopy and on-chip light-wave electronics.
Proceedings Paper
Engineering, Electrical & Electronic
Johannes Drozella, Andrea Toulouse, Pascal Motzfeld, Nils Fahrbach, Valese Aslani, Simon Thiele, Alois M. Herkommer, Harald Giessen
Summary: Modern two-photon-polymerization 3D printing technology allows for the creation of complex freeform optical surfaces with high control and accuracy. However, there may still be some systematic deviation due to volumetric changes during the polymerization and development process. This paper presents a method to include repeatable measurements and shape correction during the production process of monolithically created complex freeform lens systems. An example of its application for creating low profile multi-aperture large field of view objectives is also provided.
LASER-BASED MICRO- AND NANOPROCESSING XVI
(2022)
Article
Nanoscience & Nanotechnology
Pascal Dreher, David Janoschka, Alexander Neuhaus, Bettina Frank, Harald Giessen, Michael Horn-von Hoegen, Frank-J Meyer Zu Heringdorf
Summary: This study utilizes spectroscopic photoemission microscopy to detect and quantify the energy shift of electrons emitted from a surface plasmon polariton focus. The field strength of the surface plasmon polariton was determined without free parameters based on the shift of electron peaks as function of laser power.
