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Title: Ultrabroadband Terahertz Near-Field Nanospectroscopy with a HgCdTe Detector

Journal Article · · ACS Photonics
ORCiD logo [1];  [1]; ORCiD logo [2];  [2];  [3];  [4];  [4]
  1. Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II); Stony Brook Univ., NY (United States)
  2. Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
  3. Columbia Univ., New York, NY (United States)
  4. Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

While near-field infrared nanospectroscopy provides a powerful tool for nanoscale material characterization, broadband nanospectroscopy of elementary material excitations in the single-digit terahertz (THz) range remains relatively unexplored. Here, we study liquid-Helium-cooled photoconductive Hg1–XCdXTe (MCT) for use as a fast detector in near-field nanospectroscopy. Compared to the common T = 77 K operation, liquid-Helium cooling reduces the MCT detection threshold to ~22 meV, improves the noise performance, and yields a response bandwidth exceeding 10 MHz. These improved detector properties have a profound impact on the near-field technique, enabling unprecedented broadband nanospectroscopy across a range of 5 to >50 THz (175 to >1750 cm–1, or <6 to 57 μm), i.e., covering what is commonly known as the “THz gap”. Our approach has been implemented as a user program at the National Synchrotron Light Source II, Upton, USA, where we showcase ultrabroadband synchrotron nanospectroscopy of phonons in ZnSe (~7.8 THz) and BaF2 (~6.7 THz), as well as hyperbolic phonon polaritons in GeS (6–8 THz).

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704; SC0019443
OSTI ID:
2229486
Alternate ID(s):
OSTI ID: 2281574; OSTI ID: 2349252
Report Number(s):
BNL-225188-2024-JAAM; BNL-225583-2024-JAAM
Journal Information:
ACS Photonics, Vol. 10, Issue 12; ISSN 2330-4022
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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