David Burghoff
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View article: Mid-infrared spectroscopy on a fiber tip for molecular monitoring
Mid-infrared spectroscopy on a fiber tip for molecular monitoring Open
Mid-infrared (mid-IR) fiber sensors offer highly specific and sensitive detection and analysis of various chemical species due to many molecular vibrations and fundamental absorption bands in this range. In this paper, we present a compact…
View article: Combs, Fast and Slow: Non‐Adiabatic Mean‐Field Theory of Active Cavities
Combs, Fast and Slow: Non‐Adiabatic Mean‐Field Theory of Active Cavities Open
Integrated frequency combs in active cavities are appealing for a broad spectrum of applications. A powerful framework for describing these cavities is mean‐field theory, which captures the averaged effect of internal dynamics over a round…
View article: Delay-resolved spectroscopy in terahertz photonic circuits
Delay-resolved spectroscopy in terahertz photonic circuits Open
Photonic integrated circuits incorporating intersubband transitions are ideal for mid-infrared and terahertz nanophotonics. However, the design of epitaxies has long been inhibited by two factors: the modest predictivity of ab initio theor…
View article: Liquid combs: broadband light with equidistance and without stability
Liquid combs: broadband light with equidistance and without stability Open
Broadband light sources with well-defined spectral structures are vital for science and technology. However, the evenly spaced lines of frequency combs represent only a small subset of all possible structured white-light sources. We demons…
View article: Ultrafast Non-Hermitian Skin Effect
Ultrafast Non-Hermitian Skin Effect Open
Topological phases of matter commonly feature protected states at their boundaries. Transferring this protection to time-metamaterials is extremely challenging, as it requires the generation of an abrupt interface between two topologically…
View article: Delay-resolved spectroscopy in terahertz photonic circuits
Delay-resolved spectroscopy in terahertz photonic circuits Open
Photonic integrated circuits incorporating intersubband transitions are ideal for mid-infrared and terahertz nanophotonics. However, the design of epitaxies has long been inhibited by two factors: the modest predictivity of ab initio theor…
View article: Development of a mid-infrared fiber sensor for molecular monitoring
Development of a mid-infrared fiber sensor for molecular monitoring Open
Mid-infrared (mid-IR) optical fiber sensors offer highly specific and sensitive detection and analysis of various chemical species due to many molecular vibrations and fundamental absorption bands in this range. In this paper, we present a…
View article: Combs, fast and slow: non-adiabatic mean field theory of active cavities
Combs, fast and slow: non-adiabatic mean field theory of active cavities Open
Integrated frequency combs based on active cavities are of interest for a wide range of applications. An elegant description of these cavities is based on mean-field theory, which averages the effect of internal dynamics occurring within a…
View article: Fundamental bandwidth limits and shaping of frequency-modulated combs
Fundamental bandwidth limits and shaping of frequency-modulated combs Open
Frequency-modulated (FM) combs based on active cavities like quantum cascade lasers have recently emerged as promising light sources in many spectral regions. Unlike passive modelocking, which generates amplitude modulation using the field…
View article: Low-loss hybrid germanium-on-zinc selenide waveguides in the longwave infrared
Low-loss hybrid germanium-on-zinc selenide waveguides in the longwave infrared Open
The longwave infrared (LWIR) range, which spans from 6 µm to 14 µm, is appealing for sensing due to strong molecular fingerprints in this range. However, the limited availability of low-loss materials that can provide higher-index waveguid…
View article: Frequency combs in optically injected terahertz ring quantum cascade lasers
Frequency combs in optically injected terahertz ring quantum cascade lasers Open
Quantum cascade lasers (QCLs) have emerged as promising candidates for generating chip-scale frequency combs in mid-infrared and terahertz wavelengths. In this work, we demonstrate frequency comb formation in ring terahertz QCLs using the …
View article: Frequency combs in optically-injected terahertz ring quantum cascade lasers
Frequency combs in optically-injected terahertz ring quantum cascade lasers Open
Quantum cascade lasers (QCLs) have emerged as promising candidates for generating chip-scale frequency combs in mid-infrared and terahertz wavelengths. In this work, we demonstrate frequency comb formation in ring terahertz QCLs using the …
View article: Integrated nonlinear photonics in the longwave-infrared: A roadmap
Integrated nonlinear photonics in the longwave-infrared: A roadmap Open
This article presents an overview of the current status and future prospects of integrated nonlinear photonics in the long-wave infrared (LWIR) spectrum, spanning 6 to 14 μm. This range is well-suited for applications such as chemical iden…
View article: Optical-pump terahertz-probe spectroscopy of the topological crystalline insulator Pb1-xSnxSe through the topological phase transition
Optical-pump terahertz-probe spectroscopy of the topological crystalline insulator Pb1-xSnxSe through the topological phase transition Open
Topological crystalline insulators -- topological insulators whose properties are guaranteed by crystalline symmetry -- can potentially provide a promising platform for terahertz optoelectronic devices, as their properties can be tuned on …
View article: High-Q longwave infrared microresonators based on a non-epitaxial germanium platform
High-Q longwave infrared microresonators based on a non-epitaxial germanium platform Open
The longwave infrared (LWIR) region of the spectrum spans 8 to 14 μm and enables high-performance sensing and imaging for detection, ranging, and monitoring. Chip-scale integrated LWIR photonics has enormous potential for real-time environ…
View article: Analytical theory of frequency-modulated combs: generalized mean-field theory, complex cavities, and harmonic states
Analytical theory of frequency-modulated combs: generalized mean-field theory, complex cavities, and harmonic states Open
Frequency-modulated (FM) combs with a linearly-chirped frequency and nearly constant intensity occur naturally in certain laser systems; they can be most succinctly described by a nonlinear Schrödinger equation with a phase potential. In t…
View article: PlotGeneration_DataRepository_AnalyticalTheoryFreqModCombs
PlotGeneration_DataRepository_AnalyticalTheoryFreqModCombs Open
A folder containing the instructions, scripts, and data to reproduce the figures from the paper, "Analytical theory of frequency-modulated combs: generalized mean-field theory, complex cavities, and harmonic states."
View article: Unraveling the origin of frequency modulated combs using active cavity mean-field theory
Unraveling the origin of frequency modulated combs using active cavity mean-field theory Open
In many laser systems, frequency combs whose output is frequency-modulated (FM) can form, producing light whose frequency sweeps linearly. While this intriguing result has been replicated experimentally and numerically, a compact descripti…
View article: Thermoelectrically Coupled Nanoantennas for Solar Research
Thermoelectrically Coupled Nanoantennas for Solar Research Open
We are developing thermoelectrically coupled nanoantennas (TECNAs) as infrared (IR) sensors for applications in solar imaging in the mid-and far-IR, both terrestrially and for future space missions.Nanoantennas are nanoscale structures tha…
View article: Frequency-modulated diode laser frequency combs at 2 μm wavelength
Frequency-modulated diode laser frequency combs at 2 μm wavelength Open
Chip-scale electrically pumped optical frequency combs (OFCs) are expected to play a fundamental role in applications ranging from telecommunications to optical sensing. To date, however, the availability of such sources around 2 μm has be…
View article: Frequency-modulated combs as phase solitons
Frequency-modulated combs as phase solitons Open
Frequency combs are light sources with coherent evenly-spaced lines. It has been observed that in certain laser systems, combs can form whose output is frequency-modulated (FM) in time. In this state, they produce an output whose frequency…
View article: High-resolution spectroscopy of arbitrary light sources using frequency\n combs
High-resolution spectroscopy of arbitrary light sources using frequency\n combs Open
Multiheterodyne techniques using frequency combs -- light sources whose lines\nare perfectly evenly-spaced -- have revolutionized optical science. By beating\nan unknown signal with the many lines of a comb, its spectrum is recovered.\nHow…
View article: High-resolution spectroscopy of arbitrary light sources using frequency combs
High-resolution spectroscopy of arbitrary light sources using frequency combs Open
Multiheterodyne techniques using frequency combs -- light sources whose lines are perfectly evenly-spaced -- have revolutionized optical science. By beating an unknown signal with the many lines of a comb, its spectrum is recovered. Howeve…
View article: Terahertz Spectroscopy of Gas Mixtures with Dual Quantum Cascade Laser Frequency Combs
Terahertz Spectroscopy of Gas Mixtures with Dual Quantum Cascade Laser Frequency Combs Open
Terahertz laser frequency combs based on quantum cascade lasers provide coherent, broadband, electrically pumped, THz radiation sources for use in future spectroscopic applications. In this work, we explore the feasibility of such lasers i…