Daniel Wasserman
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View article: Dark current mechanisms in ultra-thin mid-wave infrared detectors
Dark current mechanisms in ultra-thin mid-wave infrared detectors Open
Mid-wave infrared photodetectors with ultra-thin (t<250nm) absorbers are characterized electrically and optically for a range of absorber doping concentrations. Negative differential resistance is observed in unintentionally doped absor…
View article: Physics-Guided Hierarchical Neural Networks for Maxwell’s Equations in Plasmonic Metamaterials
Physics-Guided Hierarchical Neural Networks for Maxwell’s Equations in Plasmonic Metamaterials Open
While machine learning (ML) has found multiple applications in photonics, traditional "black box" ML models typically require prohibitively large training data sets. Generation of such data, as well as the training processes themselves, co…
View article: Primordial Metamaterials
Primordial Metamaterials Open
The electromagnetic response of materials serves as the foundation for a broad range of vital applications, including but not limited to imaging, sensing, as well as classical and quantum communications. Here we demonstrate, theoretically …
View article: Lateral cavity-enhanced guided mode resonance structures for mid-wave infrared photodetector pixels
Lateral cavity-enhanced guided mode resonance structures for mid-wave infrared photodetector pixels Open
We present the design, fabrication, and optical characterization of ultra-compact mid-wave infrared photodetector pixels. Our design relies on a guided mode resonance structure to confine incident mid-infrared light to the 250 nm-thick abs…
View article: Lateral Cavity-Enhanced Guided Mode Resonance Structures for Mid-wave Infrared Photodetector Pixels
Lateral Cavity-Enhanced Guided Mode Resonance Structures for Mid-wave Infrared Photodetector Pixels Open
We present the design, fabrication, and optical characterization of ultra-compact mid-wave infrared photodetector pixels. Our design relies on a guided mode resonance structure to confine incident mid-infrared light to the 250 nm-thick abs…
View article: Quantum Pathways Institute contributions to a roadmap for technical implementation and scientific interpretation of a spaceborne quantum gravity gradiometer.
Quantum Pathways Institute contributions to a roadmap for technical implementation and scientific interpretation of a spaceborne quantum gravity gradiometer. Open
The Quantum Pathways Institute (QPI), sponsored by NASA/STMD, is a collaborative effort between UT Austin, CU Boulder, Caltech, UC Santa Barbara, and NIST. The QPI is focused on advancing quantum sensing technology for next-generation Eart…
View article: Infrared Metaplasmonics
Infrared Metaplasmonics Open
Plasmonic response in metals, defined as the ability to support subwavelength confinement of surface plasmon modes, is typically limited to a narrow frequency range below the metals' plasma frequency. This places severe limitations on the …
View article: Ultrastrong Coupling by Assembling Plasmonic Metal Oxide Nanocrystals in Open Cavities
Ultrastrong Coupling by Assembling Plasmonic Metal Oxide Nanocrystals in Open Cavities Open
Plasmon polaritons created by coupling optical cavity modes with plasmonic resonances offer widely tunable frequencies and strong light-matter interaction. While metallic nanocrystals (NCs) are compelling building blocks, existing approach…
View article: Plasmonic Metal Oxide Nanocrystals as Building Blocks for Infrared Metasurfaces
Plasmonic Metal Oxide Nanocrystals as Building Blocks for Infrared Metasurfaces Open
Based on experimental and simulation methods we helped develop, we are advancing mechanistic understanding of how self-assembled NC metamaterials can produce distinctive near- and far-field optical properties not readily achievable in lith…
View article: High-Q Ring Resonators in Low-Loss Monolithic Barium Titanate on Silicon
High-Q Ring Resonators in Low-Loss Monolithic Barium Titanate on Silicon Open
We investigate loss mechanisms in monolithic photonic structures fabricated from barium titanate grown epitaxially by RF-sputtering on silicon-on-insulator substrates. We characterize barium titanate waveguide loss using three photonic arc…
View article: Anomalous reflection for highly efficient subwavelength light concentration and extraction with photonic funnels
Anomalous reflection for highly efficient subwavelength light concentration and extraction with photonic funnels Open
Photonic funnels, microscale conical waveguides that have been recently realized in the mid-IR spectral range with the help of an all-semiconductor designer metal material platform, are promising devices for efficient coupling of light bet…
View article: Mid‐Infrared Perfect Absorption with Planar and Subwavelength‐Perforated Ultrathin Metal Films
Mid‐Infrared Perfect Absorption with Planar and Subwavelength‐Perforated Ultrathin Metal Films Open
A straightforward analytical approach is proposed for the design of minimally thin metal absorbers. Unlike traditional resonant design principles, where shape, size, and periodicity of a nanostructured film determine the absorption propert…
View article: High-speed long-wave infrared ultra-thin photodetectors
High-speed long-wave infrared ultra-thin photodetectors Open
The primary challenge for long-wavelength infrared (λ = 8–13 µm) detection has long been the mitigation of dark current while achieving a high conversion efficiency of optical to electrical signals. Often overlooked is the bandwidth of det…
View article: Structural Order and Plasmonic Response of Nanoparticle Monolayers
Structural Order and Plasmonic Response of Nanoparticle Monolayers Open
Collective plasmon resonances in superlattice assemblies of metallic nanoparticles are influenced by nanoparticle attributes and assembly structure. Although grain boundaries and other structural defects are inherent to superlattices assem…
View article: Wavelength Tunable Infrared Perfect Absorption in Plasmonic Nanocrystal Monolayers
Wavelength Tunable Infrared Perfect Absorption in Plasmonic Nanocrystal Monolayers Open
The ability to efficiently absorb light in ultrathin subwavelength) layers is essential for modern electro-optic devices, including detectors, sensors, and nonlinear modulators. Tailoring these ultrathin films’ spectral, spatial, and polar…
View article: Perfect Absorption at the Ultimate Thickness Limit in Planar Films
Perfect Absorption at the Ultimate Thickness Limit in Planar Films Open
Reducing device volume is one of the key requirements for advanced nanophotonic technologies, however this demand is often at odds with designing highly absorbing elements which usually require sizeable thicknesses, such as for detector an…
View article: Decoupling absorption and radiative cooling in mid-wave infrared bolometric elements
Decoupling absorption and radiative cooling in mid-wave infrared bolometric elements Open
We present a spectrally selective, passively cooled mid-wave infrared bolometric absorber engineered to spatially and spectrally decouple infrared absorption and thermal emission. The structure leverages an antenna-coupled metal–insulator–…
View article: Quantum dot materials for mid-IR photodetection: opinion
Quantum dot materials for mid-IR photodetection: opinion Open
In this opinion we trace the evolution of the quantum dot mid-infrared photodetector, from epitaxially-grown self-assembled quantum dot detectors, to a new generation of colloidal nano-crystal based devices. We opine on the advantages and …
View article: High-gain low-excess-noise MWIR detection with a 3.5-<i>µ</i>m cutoff AlInAsSb-based separate absorption, charge, and multiplication avalanche photodiode
High-gain low-excess-noise MWIR detection with a 3.5-<i>µ</i>m cutoff AlInAsSb-based separate absorption, charge, and multiplication avalanche photodiode Open
Mid-wavelength infrared (MWIR) detection is useful in a variety of scientific and military applications. Avalanche photodiodes can provide an advantage for detection as their internal gain mechanism can increase the system signal-to-noise …
View article: All-epitaxial resonant cavity enhanced long-wave infrared detectors for focal plane arrays
All-epitaxial resonant cavity enhanced long-wave infrared detectors for focal plane arrays Open
We demonstrate a monolithic all-epitaxial resonant-cavity architecture for long-wave infrared photodetectors with substrate-side illumination. An nBn detector with an ultra-thin (t≈350 nm) absorber layer is integrated into a leaky resonant…
View article: Photoluminescence from InSb1−xBix alloys at extended wavelengths on InSb
Photoluminescence from InSb1−xBix alloys at extended wavelengths on InSb Open
The incorporation of dilute concentrations of bismuth into traditional III–V alloys produces significant reductions in bandgap energy presenting unique opportunities in strain and bandgap engineering. However, the disparity between the ide…
View article: Response Times of Degenerately Doped Semiconductor Based Plasmonic Modulator
Response Times of Degenerately Doped Semiconductor Based Plasmonic Modulator Open
We present a transient response study of a semiconductor-based plasmonic switch. The proposed device operates through active control and modulation of localized electron density waves i.e., Surface Plasmon Polaritons (SPPs) at degenerately…
View article: High operating temperature plasmonic infrared detectors
High operating temperature plasmonic infrared detectors Open
III–V semiconductor type-II superlattices (T2SLs) are a promising material system with the potential to significantly reduce the dark current of, and thus realize high-performance in, infrared photodetectors at elevated temperatures. Howev…
View article: Room-Temperature Mid-Wave Infrared Guided-Mode Resonance Detectors
Room-Temperature Mid-Wave Infrared Guided-Mode Resonance Detectors Open
In this work, we report guided-mode resonance enhanced room-temperature mid-wave infrared photodetectors with significant spectral-selective enhancement in responsivity and detectivity, all in the absorber thickness of only 250 nm.
View article: Room-Temperature Mid-Wave Infrared Guided-Mode Resonance Detectors
Room-Temperature Mid-Wave Infrared Guided-Mode Resonance Detectors Open
In this work, we report guided-mode resonance enhanced room-temperature mid-wave infrared photodetectors with significant spectral-selective enhancement in responsivity and detectivity, all in the absorber thickness of only 250 nm.
View article: Plasmon-enhanced distributed Bragg reflectors
Plasmon-enhanced distributed Bragg reflectors Open
We explore distributed Bragg reflectors leveraging a reduction in the refractive index of highly-doped InAs due to free carrier effects.
View article: Plasmon-enhanced distributed Bragg reflectors
Plasmon-enhanced distributed Bragg reflectors Open
We explore distributed Bragg reflectors leveraging a reduction in the refractive index of highly-doped InAs due to free carrier effects.
View article: Ultra-thin plasmonic detectors
Ultra-thin plasmonic detectors Open
Plasmonic materials, and their ability to enable strong concentration of optical fields, have offered a tantalizing foundation for the demonstration of sub-diffraction-limit photonic devices. However, practical and scalable plasmonic optoe…
View article: Bright mid-infrared photoluminescence from high dislocation density epitaxial PbSe films on GaAs
Bright mid-infrared photoluminescence from high dislocation density epitaxial PbSe films on GaAs Open
We report on photoluminescence in the 3–7 µm mid-wave infrared (MWIR) range from sub-100 nm strained thin films of rocksalt PbSe(001) grown on GaAs(001) substrates by molecular beam epitaxy. These bare films, grown epitaxially at temperatu…
View article: Low-threshold InP quantum dot and InGaP quantum well visible lasers on\n silicon (001)
Low-threshold InP quantum dot and InGaP quantum well visible lasers on\n silicon (001) Open
Monolithically combining silicon nitride (SiNx) photonics technology with\nIII-V active devices could open a broad range of on-chip applications spanning\na wide wavelength range of ~400-4000 nm. With the development of nitride,\narsenide,…