Lucy L. Hale
YOU?
Author Swipe
View article: Resonance-Amplified Terahertz Near-Field Spectroscopy of a Single Nanowire
Resonance-Amplified Terahertz Near-Field Spectroscopy of a Single Nanowire Open
Nanoscale material systems are central to next-generation optoelectronic and quantum technologies, yet their development remains hindered by limited characterization tools, particularly at terahertz (THz) frequencies. Far-field THz spectro…
View article: Non-contact imaging of terahertz surface currents with aperture-type near-field microscopy
Non-contact imaging of terahertz surface currents with aperture-type near-field microscopy Open
Terahertz (THz) near-field imaging and spectroscopy provide valuable insights into the fundamental physical processes occurring in THz resonators and metasurfaces on the subwavelength scale. However, so far, the mapping of THz surface curr…
View article: THz Near-field spectroscopy of metamaterial resonators
THz Near-field spectroscopy of metamaterial resonators Open
Terahertz near-field spectroscopy is a powerful technique for the investigation of metamaterial resonators with subwavelength resolution. Here, we used an a-SNOM THz time domain spectroscopic system for the direct study of all the modes su…
View article: Continuous wave terahertz detection using 1550 nm pumped nonlinear photoconductive GaAs metasurfaces
Continuous wave terahertz detection using 1550 nm pumped nonlinear photoconductive GaAs metasurfaces Open
Terahertz (THz) continuous wave (CW) spectroscopy systems can offer extremely high spectral resolution over the THz band by photo-mixing high-performance telecommunications-band (1530-1565 nm) lasers. However, typical THz CW detectors in t…
View article: Photoconductive metasurfaces for near-field terahertz sources and detectors
Photoconductive metasurfaces for near-field terahertz sources and detectors Open
Aperture near-field microscopy and spectroscopy (a-SNOM) enables the direct experimental investigation of subwavelength-sized resonators by sampling highly confined local evanescent fields on the sample surface. Despite its success, the ve…
View article: Near-field imaging and spectroscopy of terahertz resonators and metasurfaces [Invited]
Near-field imaging and spectroscopy of terahertz resonators and metasurfaces [Invited] Open
Terahertz (THz) metasurfaces have become a key platform for engineering light-matter interaction at THz frequencies. They have evolved from simple metallic resonator arrays into tunable and programmable devices, displaying ultrafast modula…
View article: Near-Field Spectroscopy of Individual Asymmetric Split-Ring Terahertz Resonators
Near-Field Spectroscopy of Individual Asymmetric Split-Ring Terahertz Resonators Open
Metamaterial resonators have become an efficient and versatile platform in the terahertz frequency range, finding applications in integrated optical devices, such as active modulators and detectors, and in fundamental research, e.g., ultra…
View article: Near-field spectroscopy of Dirac plasmons in Bi2Se3 ribbon arrays
Near-field spectroscopy of Dirac plasmons in Bi2Se3 ribbon arrays Open
Plasmons supported in the massless electron surface states of topological insulators (TIs), known as Dirac plasmons, have great potential in next generation optoelectronics. However, their inherent confinement to the surface makes the inve…
View article: Terahertz pulse generation with binary phase control in non-linear InAs metasurface
Terahertz pulse generation with binary phase control in non-linear InAs metasurface Open
The effect of terahertz (THz) pulse generation has revolutionized broadband coherent spectroscopy and imaging at THz frequencies. However, THz pulses typically lack spatial structure, whereas structured beams are becoming essential for adv…
View article: Terahertz Detection Using Enhanced Two‐Step Absorption in Photoconductive Metasurfaces Gated at λ = 1.55 µm
Terahertz Detection Using Enhanced Two‐Step Absorption in Photoconductive Metasurfaces Gated at λ = 1.55 µm Open
Superior ultrafast photoconductive properties make low temperature grown (LT) GaAs one of the best materials for photoconductive terahertz (THz) detection. However, the large bandgap of LT‐GaAs limits its operation to gating at wavelengths…
View article: Correction to “Terahertz Pulse Generation from GaAs Metasurfaces”
Correction to “Terahertz Pulse Generation from GaAs Metasurfaces” Open
[This corrects the article DOI: 10.1021/acsphotonics.1c01908.].
View article: Terahertz Pulse Generation from GaAs Metasurfaces
Terahertz Pulse Generation from GaAs Metasurfaces Open
Ultrafast optical excitation of select materials gives rise to the generation of broadband terahertz (THz) pulses. This effect has enabled the field of THz time-domain spectroscopy and led to the discovery of many physical mechanisms behin…
View article: Investigating Bi2Se3 Plasmons using Terahertz Near Field Spectroscopy .
Investigating Bi2Se3 Plasmons using Terahertz Near Field Spectroscopy . Open
THz near-field microscopy for mode mapping and local spectroscopy demonstrates the potential of near-field methods for studies of subwavelength plasmonic THz resonators.
View article: Highly efficient terahertz photoconductive metasurface detectors operating at microwatt-level gate powers
Highly efficient terahertz photoconductive metasurface detectors operating at microwatt-level gate powers Open
Despite their wide use in terahertz (THz) research and technology, the application spectra of photoconductive antenna (PCA) THz detectors are severely limited due to the relatively high optical gating power requirement. This originates fro…
View article: Tunable Fully Absorbing Metasurfaces for Efficient THz Detection
Tunable Fully Absorbing Metasurfaces for Efficient THz Detection Open
Terahertz photoconductive antennas with a nanostructured active region have been actively investigated recently with a goal to achieve high efficiency THz detectors and emitters. Here we provide a novel design of perfectly-absorbing photoc…
View article: Perfect absorption in GaAs metasurfaces near the bandgap edge
Perfect absorption in GaAs metasurfaces near the bandgap edge Open
Perfect optical absorption occurs in a metasurface that supports two degenerate and critically-coupled modes of opposite symmetry. The challenge in designing a perfectly absorbing metasurface for a desired wavelength and material stems fro…
View article: Perfectly absorbing dielectric metasurfaces for photodetection
Perfectly absorbing dielectric metasurfaces for photodetection Open
Perfect absorption of light by an optically thin metasurface is among several remarkable optical functionalities enabled by nanophotonics. This functionality can be introduced into optoelectronic devices by structuring an active semiconduc…
View article: Near‐Field Terahertz Spectroscopy: Noninvasive Near‐Field Spectroscopy of Single Subwavelength Complementary Resonators (Laser Photonics Rev. 14(4)/2020)
Near‐Field Terahertz Spectroscopy: Noninvasive Near‐Field Spectroscopy of Single Subwavelength Complementary Resonators (Laser Photonics Rev. 14(4)/2020) Open
Subwavelength metallic resonators provide tight spatial confinement of electromagnetic fields, required for strong light-matter coupling. However far-field techniques prove to be impractical for detection of such fields. In article 1900254…
View article: Resonance-Enhanced Terahertz Nanoscopy Probes
Resonance-Enhanced Terahertz Nanoscopy Probes Open
Near-field nanoscopy at terahertz (THz) frequencies is uniquely placed to probe a multitude of physical phenomena at the nanoscale. However, at THz frequencies, the scattering efficiency of standard near-field probes is poor, limiting the …
View article: Terahertz detectors based on all-dielectric photoconductive metasurfaces
Terahertz detectors based on all-dielectric photoconductive metasurfaces Open
Performance of terahertz (THz) photoconductive devices, including detectors and emitters, has been improved recently by means of plasmonic nanoantennae and gratings. However, plasmonic nanostructures introduce Ohmic losses, which limit gai…
View article: Probe-Sample Interaction in Aperture-type THz Near-Field Microscopy of Complementary Resonators
Probe-Sample Interaction in Aperture-type THz Near-Field Microscopy of Complementary Resonators Open
Subwavelength complementary metallic resonators operating in the terahertz (THz) regime are investigated with aperture near-field microscopy and spectroscopy. In contrast to far-field methods, the spectra of individual isolated resonators …
View article: Efficient Terahertz Detection with Perfectly-Absorbing Metasurface
Efficient Terahertz Detection with Perfectly-Absorbing Metasurface Open
We demonstrate a unique photoconductive design for terahertz (THz) detection based on a perfectly absorbing, all-dielectric metasurface. Our design exploits Mie resonances in electrically connected cubic resonators fabricated in low-temper…
View article: Terahertz Detection with Perfectly-Absorbing Photoconductive Metasurface
Terahertz Detection with Perfectly-Absorbing Photoconductive Metasurface Open
Terahertz (THz) photoconductive devices are used for generation, detection, and modulation of THz waves, and they rely on the ability to switch electrical conductivity on a subpicosecond time scale using optical pulses. However, fast and e…
View article: MAESTROS: A Multiwavelength Time-Domain NIRS System to Monitor Changes in Oxygenation and Oxidation State of Cytochrome-C-Oxidase
MAESTROS: A Multiwavelength Time-Domain NIRS System to Monitor Changes in Oxygenation and Oxidation State of Cytochrome-C-Oxidase Open
We present a multiwavelength, multichannel, time-domain near-infrared spectroscopy system named MAESTROS. This instrument can measure absorption and scattering coefficients and can quantify the concentrations of oxy- and deoxy-haemoglobin …