24 papers · ranked by Valyu relevance
Jian Ge, Zhangqi Dang, Ziru Zhang, Chenxu Gao + 14 more
Answering the question "Are we alone?" requires atmospheric spectroscopy of nearby terrestrial planets. For an Earth--Sun analog, even the strongest transmission signals are expected to be of order 1 part per million (ppm). Unlike short-period planets, Earth 2.0 planets transit only about once per year, so…
Jiaqi Wang, Yuan-Hao Yang, Zheng-Xu Zhu, Juanjuan Lu + 11 more
Optical spectrometers are indispensable tools across various fields, from chemical and biological sensing to astronomical observations and quantum technologies. However, the integration of spectrometers onto photonic chips has been hindered by the low spectral resolution or large device footprint with complex multiple…
Jeronimo Calderon-Gomez, Frantz Martinache, Nick Cvetojevic, Marc-Antoine Martinod + 13 more
Astrophotonics is a field that intends to meet the needs of next-generation instruments at a small footprint, low cost, and high stability, compared to bulk-optics-based alternatives. Much development effort is driven by the stringent requirements of direct detection and characterization of exoplanets. Our team works…
Brandon Redding, Joseph B. Murray, Matthew J. Murray, Ross T. Schermer + 10 more
Designing miniaturized optical spectrometers is an increasingly active area of research as spectrometers are crucial components for a wide range of applications including chemical and material analysis, medical diagnostics, classical and quantum sensing, characterization of light sources, and radio frequency (RF)…
L. Xia, P. J. M. van der Slot, M. Timmerkamp, C. Fallnich + 1 more
1 Laser Physics and Nonlinear Optics, Department of Applied Nanophotonics, Faculty of Science and Technology, MESA+ Institute, University of Twente, P.O. Box 217, 7500 AE Enschede, the Netherlands 2 Nonlinear Nanophotonics, Department of Applied Nanophotonics, Faculty of Science and Technology, MESA+ Institute…
Jinwen Zhang, Haitao Zhang, Zhuoyi Yang, Xin Zhu
This paper presents a novel free-space optical Angle-of-Arrival (AOA) estimation method based on arrayed waveguide coherent mode decoding, aiming to surpass the inherent limitations of traditional AOA detection technologies, which face significant challenges in achieving miniaturization, low complexity, and high…
Bhupesh Kumar, Graham D. Bruce, Luca Dal Negro, Sebastian A. Schulz
Disorder-driven, integrated speckle spectrometers offer exceptional spectral resolution within a compact design. They benefit from enhanced optical path lengths due to multiple light scattering events, however, often at the cost of low optical throughput. Here, we investigate the relationship between these two figures…
Hongzhi Xiong, Xinmin Yao, Ming Zhang, Qingrui Yao + 7 more
Supercontinuum generation makes use of the nonlinear optical effects arising from the interaction of light with the bound electronic states in crystal lattices and has many applications, especially in the ultraviolet for the direct probing of large-energy electronic transitions. However, supercontinuum from integrated…
Xiaodong Shi, Angela Anna Baiju, Xu Chen, Sakthi Sanjeev Mohanraj + 11 more
Squeezed states of light play a key role in quantum-enhanced sensing and continuous-variable quantum information processing. Realizing integrated squeezed light sources is crucial for developing compact and scalable photonic quantum systems. In this work, we demonstrate on-chip broadband vacuum squeezing at…
Surjendu Bikash Dutta, Wolfgang Hübner, Paul Goffing, Anders Kokkvoll Engdahl + 5 more
The actin cytoskeleton in activated T cells undergoes rapid structural changes during the formation of an immunological synapse. Superresolution fluorescence microscopy provides excellent means to visualize such antibody-triggered changes. Here, we use single-molecule localization microscopy (SMLM) enabled by…
Cheng-Yi Cheng, Kuan-Han Wu, Jiang-Qin Shi, Rohit Gupta + 1 more
We demonstrate a voltage-tunable plasmonic modulator that integrates a Bi2Se3 topological insulator thin film with a metal-dielectric plasmonic waveguide. The Bi2Se3 layer, transferred using a polymer-assisted method, enhances the modulation depth of the waveguide by enabling electrically driven carrier redistribution…
Meicheng Fu, Huaqing Qiu, Hongyu Zhang, Xin Chen + 9 more
Conventional photonic integrated circuits (PICs) are fundamentally limited by single-wavelength-band operation. To transcend this barrier, we introduce a multiple-wavelength-band platform using a 2.5D integration scheme that monolithically combines silicon and silicon nitride waveguides side-by-side on a single chip.…
Adam Stovicek, Murat Serhatlioglu, Babak Rezaei, Stephan Sylvest Keller + 4 more
We demonstrate the first viscoelastic-based flow-integrated Raman spectroscopy (FIRS) platform using spontaneous Raman spectroscopy with a simplified fluidic design that precisely controls particle transit speed and predicts arrival time to the Raman interrogation region, together with time synchronized triggered…
Rong Tang, Jiaze Yin, Bethany Weinberg, Haonan Lin + 4 more
By optically sensing mid-infrared absorption through a visible probe beam, mid-infrared photothermal (MIP) microscopy has emerged as a powerful tool for chemical imaging with micromolar sensitivity and submicron spatial resolution. The adoption of spatially multiplexed camera-based widefield detection further enhanced…
Authors not listed
All-inorganic halide perovskites, especially CsPbBr3 microcrystals, are often considered to be optically stable and less defect-prone compared to their organometallic counterparts. Nevertheless, reports of photoluminescence (PL) blinking in bulk perovskite systems till date are restricted to organometallic halide…
Anna Lena Schäfer, Cristina Gellini, Rolf Diller, Katrina T. Forest + 2 more
Time-resolved resonance Raman spectroscopy with continuous-wave excitation is a fundamental technique that has contributed substantially to the understanding of structure and dynamics of bacteriorhodopsin and related retinal proteins. However, the underlying principles were developed about fifty years ago for…
J. Demas, L. Tan, S. Ramachandran
The performance of a laser scanning microscope inevitably depends on the performance of the point detector. As laser scanning approaches aim to penetrate deeper in tissue, there is a commensurate need for detectors that can operate with high sensitivity, bandwidth, and dynamic range at near-infrared wavelengths where…
Lynn M. Sidor, Kathren P. Sage, Michelle M. Beaulieu, Dylan F. Wilson + 6 more
Recently, engineered bacterial cells have been shown to behave as optically-active photonic devices comparable to industrially fabricated microlenses^1^. Bacterial cells can be encapsulated within a layer of polysilicate through surface display of the sea sponge enzyme silicatein, which mineralizes a polysilicate…
Authors not listed
This study presents a filterless mid-infrared (MIR) photodetector that integrates the wavelength-selective photo-thermal conversion properties of a Metal/Insulator/Metal (MIM) nanostructure metasurface with the high-sensitivity thermoelectric conversion of a thermopile (series-connected thermocouples). We overcame the…
Liam Shaughnessy, Lauren Vannell, Sulekh Fernando-Peiris, Cristina Rodríguez
Three-photon microscopy enables deep-tissue imaging but is highly sensitive to excitation pulse quality, since three-photon excitation efficiency scales with the cube of instantaneous intensity. Group-delay dispersion (GDD) and third-order dispersion (TOD) accumulated through the laser and microscope optics can…
Authors not listed
The study of artwork is an interesting field that has undergone a major turn the last decades as new scientific analysis methods have been introduced and is becoming a significant part of the investigations. In this study we have employed Raman spectroscopy to analyse the pigments in an old painting of the Roman…
Authors not listed
The combination of gas-phase infrared (IR) spectroscopy with ion mobility spectrometry and mass spectrometry provides detailed, multi-dimensional structural information that facilitates the identification of unknown analytes. The instrumentation for performing these measurements is typically home-built and requires…
Authors not listed
S-Adenosyl methionine (SAM) is a biomolecule containing an adenosyl cation bonded to the sulfur atom of methionine (Met). SAM is a primary methyl donor and the precursor of the Gluthatione (GSH). Due to the role played by SAM in the proper functioning of cellular metabolism, it is an interesting biomolecule to be…
Authors not listed
We present a mechanistic framework to characterize photon absorption in quantum dots, enabling rational optimization of image sensor designs. Our analysis is based on the Analytic Path structured-field model, which treats both electrons and photons as extended electromagnetic structures rather than point particles.…