A5001708464- Photonic and Optical Devices
- Photonic Crystals and Applications
- Advanced Fiber Laser Technologies
- Quantum optics and atomic interactions
- Plasmonic and Surface Plasmon Research
- Quantum Information and Cryptography
- Advanced Fluorescence Microscopy Techniques
- Gold and Silver Nanoparticles Synthesis and Applications
- Orbital Angular Momentum in Optics
- Nonlinear Optical Materials Studies
- Laser-Matter Interactions and Applications
- Semiconductor Lasers and Optical Devices
- Mechanical and Optical Resonators
- Solid State Laser Technologies
- 2D Materials and Applications
- Photorefractive and Nonlinear Optics
- Quantum Dots Synthesis And Properties
- Optical Coatings and Gratings
- Diamond and Carbon-based Materials Research
- Optical Coherence Tomography Applications
- Nanowire Synthesis and Applications
- Semiconductor materials and devices
- Metamaterials and Metasurfaces Applications
- Perovskite Materials and Applications
- Near-Field Optical Microscopy
Aalto University
2023-2025
Massachusetts Institute of Technology
2018-2023
Massachusetts General Hospital
2017-2023
Harvard University
2017-2023
Brookhaven National Laboratory
2015-2021
University of Rochester
2009-2017
Center for Functional Nanomaterials
2016
Abstract Miniaturized spectrometers are of immense interest for various on-chip and implantable photonic optoelectronic applications. State-of-the-art conventional spectrometer designs rely heavily on bulky dispersive components (such as gratings, photodetector arrays, interferometric optics) to capture different input spectral that increase their integration complexity. Here, we report a high-performance broadband based simple compact van der Waals heterostructure diode, leveraging careful...
Reconstructive optoelectronic spectroscopy has generated substantial interest in the miniaturization of traditional spectroscopic tools, such as spectrometers. However, most state-of-the-art demonstrations face fundamental limits rank deficiency photoresponse matrix. In this work, we demonstrate a miniaturized spectral sensing system using an electrically tunable compact interface, which generates distinguishable photoresponses from various input spectra, enabling accurate identification...
Abstract The ability to track individual cells in space over time is crucial analyzing heterogeneous cell populations. Recently, microlaser particles have emerged as unique optical probes for massively multiplexed single-cell tagging. However, the far-field emission inherently direction-dependent, which causes strong intensity fluctuations when orientation of particle varies randomly inside cells. Here, we demonstrate a general solution based on incorporation nanoscale light scatterers into...
Abstract Chip-scale, high-energy optical pulse generation is becoming increasingly important as integrated optics expands into space and medical applications where miniaturization needed. Q -switching of the laser cavity was historically first technique to generate pulses, typically such systems are in realm large bench-top solid-state lasers fibre lasers, especially long wavelength range >1.8 µm, thanks their energy storage capacity. However, photonics, very property tight mode...
Abstract Photonics technologies play a crucial role in driving technological advancements within the agrifood industry, aiming to deliver sustainable food and agriculture, offering healthy, nutritious safe for all of us. Particularly, optical sensors imaging systems, together with machine-learning processing advanced lighting, pivotal monitoring crop soil health unprecedented precision, while safeguarding supply chain. This roadmap aims provide an overview state-of-the-art photonics...
In 1924 David Hilbert conceived a paradoxical tale involving hotel with an infinite number of rooms to illustrate some aspects the mathematical notion "infinity." continuous-variable quantum mechanics we routinely make use state spaces: here show that such theoretical apparatus can accommodate analog Hilbert's paradox. We devise protocol that, mimicking what happens guests hotel, maps amplitudes eigenbasis twice their original in coherent and deterministic manner, producing infinitely many...
Most optoelectronic components and consumer display devices require glass or plastic covers for protection against the environment. Optical reflections from these encapsulation layers can degrade device performance lessen user experience. Here, we use a highly scalable self-assembly based approach to texture surfaces at nanoscale, reducing by such an extent so as make essentially invisible. Our nanotextures provide broadband antireflection spanning visible infrared wavelengths (450–2500 nm)...
Spectroscopic methods are a sensitive way to determine the chemical composition of potentially hazardous materials. Here, we demonstrate that thermally tuned high-Q photonic crystal cavities can be used as compact high-resolution on-chip spectrometer. We have such chip-scale spectrometer measure absorption spectra both acetylene and hydrogen cyanide in 1550 nm spectral band show discriminate between two species even though materials features same region. Our results pave for development...
We observe experimentally the self-phase modulation of a surface plasmon-polariton (SPP) propagating along gold film bounded by air in Kretschmann-Raether configuration. Through analyzing power dependence reflectance curve as function incidence angle, we characterize complex-valued nonlinear propagation coefficient SPP. Moreover, present procedure that can further extract complex value third-order susceptibility from our experimental data. Our work provides direct insights into control SPPs...
Abstract Developing selective and coherent polymorphic crystals at the nanoscale offers a novel strategy for designing integrated architectures photonic optoelectronic applications such as metasurfaces, optical gratings, photodetectors, image sensors. Here, direct writing approach is demonstrated to deterministically create 2D materials by locally inducing metallic 1T′‐MoTe 2 on semiconducting 2H‐MoTe host layer. In polymorphic‐engineered MoTe , 2H‐ 1T′‐ crystalline phases exhibit strong...
We observe experimentally that the reflectances of metal-dielectric nanocomposite films in Kretschmann configuration show different characteristics, depending on metal fill fraction f, fall into one three distinct regimes. In "metallic" regime, which f is large, film supports conventional surface-plasmon polaritons (SPPs), and can tailor properties SPPs by controlling value f. "dielectric" small, does not support any surface modes. intermediate "lossy" a SPP mode from film. These results are...
Efficient collection of fluorescence from nitrogen vacancy (NV) centers in diamond underlies the spin-dependent optical read-out that is necessary for quantum information processing and enhanced sensing applications.The efficiency NVs within substrates limited primarily due to high refractive index non-directional dipole emission.Here we introduce a light strategy based on chirped, circular dielectric gratings can be fabricated bulk substrate modify an emitter's far-field radiation...
Photochemical crosslinking of the sclera is an emerging technique that may prevent excessive eye elongation in pathologic myopia by stiffening scleral tissue. To overcome challenge uniform light delivery anatomically restricted space, we previously introduced use flexible polymer waveguides. We presently demonstrate advanced waveguides are optimized to deliver selectively equatorial intact orbit.Our consist a polydimethylsiloxane cladding and polyurethane core, coupled optical fiber. A...
A microfluidic device is developed that uses the narrowband optical radiation of laser particle barcodes to sort tagged cells.
We present experimental evidence that the contribution of Goos-H\"anchen shift to tunneling delay is suppressed in frustrated total internal reflection. use a Hong-Ou-Mandel interferometer perform direct time measurements reflection delays with femtosecond resolution at optical frequencies, and take advantage liquid-crystal-filled double-prism structure dynamically change refractive index barrier region.
Anti-ambipolar transistors (AATs) are the leading platform for paradigm shift from binary to multi-valued logic (MVL) circuits, increasing circuit integration density and data processing capacity. However, most AATs with p–n heterojunctions present limited controllability of transconductance peak, which is key MVL operation. Here, we report optically configurable AAT/bi-AAT photoresponses implemented an InSe field-effect transistor potential operations. The charge trapping detrapping...
We investigate the applicability of photonic crystal waveguides to high-resolution on-chip spectrometers. argue that figure merit by which their performance should be gauged is not group index bandwidth product, are usually optimized for, but working finesse, relates maximum number spectral lines resolvable a slow-light spectrometer. Through numerical simulation, we show properly-optimized waveguide could form basis spectrometer with resolution 0.04 nm over 12.5 near 1550 and footprint six...
We demonstrate a direct relationship between tunneling delays in one-dimensional potential barrier and the observed frustrated total internal reflection. Expressions relating group these two cases have been formulated past [A. M. Steinberg R. Y. Chiao, Phys. Rev. A 49, 3283 (1994)], but only for certain limits of normalized particle energy $E/{V}_{0}$. Here, we derive single expression that is valid arbitrary by decomposing delay into dwell-time self-interference components. This...
We present here our results on using liquid crystals (LCs) in experiments with nonclassical light sources: (1) single-photon sources exhibiting antibunching (separation of all photons time), which are key components for secure quantum communication systems and (2) entangled photon source interference a Hong–Ou–Mandel interferometer. In the first part, both nematic cholesteric crystal (CLC) hosts were used to create definite linear or circular polarization antibunched emitted by different...
Abstract A novel atomic layer method for encapsulating individual micro‐ and nano‐particles with thin (sub‐10‐nm) dielectric films is presented. This leverages the diffusion of vapor‐phase precursors through an underlying inert polymer film to achieve growth a metal oxide on all sides particle simultaneously, even side that in contact substrate. Crucially, deposition performed stationary particles does not require agitation mechanism or special reaction chamber. Here, conformal coatings...
Laser particles are an emerging technology with unique stimulated emission properties. The ability to produce laser over a wide spectral range is critical for massive wavelength-division multiplexing. Here we show novel method fabricate semiconductor microdisk wavelengths spanning 500 nm from single epitaxial wafer. wafer consists of nine gain layers InGaAsP different quaternary compositions cover lasing 1150 1650 nm. With optical pumping at 1064 nm, these then used track the movements...
Semiconductor-based laser particles (LPs) with exceptionally narrowband spectral emission have been used in biological systems for cell tagging purposes. Fabrication of these LPs typically requires highly specialized lithography and etching equipment, is done a cleanroom environment, hindering the broad adoption this exciting new technology. Here, using only easily accessible laboratory we demonstrate simple layer-by-layer fabrication strategy that overcomes obstacle. We start from an indium...
Abstract Chip-scale, high-energy optical pulse generation is becoming increasingly important as we expand activities into hard to reach areas such space and deep ocean. Q-switching of the laser cavity best known technique for generating pulses, typically systems are in realm large bench-top solid-state lasers fiber lasers, especially long wavelength range >1.8 µm, thanks their energy storage capacity. However, integrated photonics, very property tight mode confinement, that enables a...
Abstract The development of a low-cost compact reconstructive spectrometer paves the way towards portable pm-resolution spectroscopy.