Ultrabroadband Terahertz Near-Field Nanospectroscopy with a HgCdTe Detector

Wehmeier, Lukas; Liu, Mengkun; Park, Suji; Jang, Houk; Basov, D. N.; Homes, Christopher C.; Carr, G. Lawrence

doi:10.1021/acsphotonics.3c01148

Cited by 6 publications

(3 citation statements)

References 72 publications

(212 reference statements)

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“…It originates from the strong tip–sample coupling of the surface phonon polaritons at frequencies where the real part of the dielectric function is slightly negative, resulting in enhancement of the near-field. 40 , 80 − 84 This phenomenon can be rationalized by considering that strong oscillators have negative values of their real dielectric function between their LO and TO modes, meaning they functionally behave as optical metals in this region, resulting in high reflectance of the incident infrared light. 69 This surface phonon polariton enhancement of the near-field signal (which is similar to surface plasmon polaritons in metals) has been observed with n-SNOM and nano-FTIR characterization in polar materials like silicon carbide, 40 amorphous SiO 2 , 81 boron nitride, 83 and SrTiO 3 .…”

Section: Resultsmentioning

confidence: 99%

Synchrotron Near-Field Infrared Nanospectroscopy and Nanoimaging of Lithium Fluoride in Solid Electrolyte Interphases in Li-Ion Battery Anodes

Dopilka,

Larson,

Cha

et al. 2024

ACS Nano

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Lithium fluoride (LiF) is a ubiquitous component in the solid electrolyte interphase (SEI) layer in Li-ion batteries. However, its nanoscale structure, morphology, and topology, important factors for understanding LiF and SEI film functionality, including electrode passivity, are often unknown due to limitations in spatial resolution of common characterization techniques. Ultrabroadband near-field synchrotron infrared nanospectroscopy (SINS) enables such detection and mapping of LiF in SEI layers in the far-infrared region down to ca. 322 cm −1 with a nanoscale spatial resolution of ca. 20 nm. The surface sensitivity of SINS and the large infrared absorption cross section of LiF, which can support local surface phonons under certain circumstances, enabled characterization of model LiF samples of varying structure, thickness, surface roughness, and degree of crystallinity, as confirmed by atomic force microscopy, attenuated total reflectance FTIR, SINS, X-ray photoelectron spectroscopy, high-angle annular dark-field, and scanning transmission electron microscopy. Enabled by this approach, LiF within SEI films formed on Cu, Si, and metallic glass Si 40 Al 50 Fe 10 electrodes was detected and characterized. The nanoscale morphologies and topologies of LiF in these SEI layers were evaluated to gain insights into LiF nucleation, growth, and the resulting nuances in the electrode surface passivity.

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Section: Resultsmentioning

confidence: 99%

Synchrotron Near-Field Infrared Nanospectroscopy and Nanoimaging of Lithium Fluoride in Solid Electrolyte Interphases in Li-Ion Battery Anodes

Dopilka,

Larson,

Cha

et al. 2024

ACS Nano

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“…HgCdTe detectors, being one of the most established commercial detection technologies, have demonstrated an expanded detection range through a reduction in operating temperature. Wehmeier et al [80] explored the utilization of liquid-helium-cooled Hg 1−X Cd X Te (MCT) as a rapid detector for near-field nanospectroscopy. The liquid-helium cooling enabled the MCT to perform unprecedented broadband nanospectroscopy, spanning from 5 to 50 THz, while exhibiting a speed of less than 10 ns compared to the common T = 77 K operation, having a profound impact on the near-field technique.…”

Section: Pce-type Broadband Photodetectormentioning

confidence: 99%

Recent Advances in Broadband Photodetectors from Infrared to Terahertz

Si,

Zhou,

Liu

et al. 2024

Micromachines

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The growing need for the multiband photodetection of a single scene has promoted the development of both multispectral coupling and broadband detection technologies. Photodetectors operating across the infrared (IR) to terahertz (THz) regions have many applications such as in optical communications, sensing imaging, material identification, and biomedical detection. In this review, we present a comprehensive overview of the latest advances in broadband photodetectors operating in the infrared to terahertz range, highlighting their classification, operating principles, and performance characteristics. We discuss the challenges faced in achieving broadband detection and summarize various strategies employed to extend the spectral response of photodetectors. Lastly, we conclude by outlining future research directions in the field of broadband photodetection, including the utilization of novel materials, artificial microstructure, and integration schemes to overcome current limitations. These innovative methodologies have the potential to achieve high-performance, ultra-broadband photodetectors.

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“…One fundamental challenge in probing and understanding the dynamical chiral magnetic phenomena is the need for "nano-THz" instrumentation [9][10][11][12][13][14][15][16][17][18][19][20][21][22] capable of viewing local magneto-THz spectra while operating simultaneously at high Tesla magnetic fields and liquid-helium temperatures. Another challenge comes the development of THz sources and detectors capable of accessing a broadband THz range [23,24]. In recent years, there have been many systems that have enabled progress towards this goal [25][26][27][28][29][30], including a recent study utilizing high magnetic fields at infrared frequencies [31]; however, such a nano-THz microscope under these conditions has only recently been achieved [32].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Near-Field Magnetic Responses on ZrTe5 through Cryogenic Magneto-THz Nano-Imaging

Haeuser,

Kim,

Park

et al. 2024

Instruments

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One manifestation of light-Weyl fermion interaction is the emergence of chiral magnetic effects under magnetic fields. Probing real space magnetic responses at terahertz (THz) scales is challenging but highly desired, as the local responses are less affected by the topologically trivial inhomogeneity that is ubiquitous in spatially averaged measurements. Here, we implement a cryogenic THz microscopy instrument under a magnetic field environment—a task only recently achieved. We explore the technical approach of this system and characterize the magnetic field’s influence on our AFM operation by statistical noise analysis. We find evidence for local near-field spatial variations in the topological semimetal ZrTe5 up to a 5-Tesla magnetic field and obtain near-field THz spectra to discuss their implications for future studies on the chiral magnetic effect.

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Ultrabroadband Terahertz Near-Field Nanospectroscopy with a HgCdTe Detector

Cited by 6 publications

References 72 publications

Synchrotron Near-Field Infrared Nanospectroscopy and Nanoimaging of Lithium Fluoride in Solid Electrolyte Interphases in Li-Ion Battery Anodes

Synchrotron Near-Field Infrared Nanospectroscopy and Nanoimaging of Lithium Fluoride in Solid Electrolyte Interphases in Li-Ion Battery Anodes

Recent Advances in Broadband Photodetectors from Infrared to Terahertz

Analysis of Near-Field Magnetic Responses on ZrTe5 through Cryogenic Magneto-THz Nano-Imaging

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