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IR Frequency Region: Fingerprint Region01:03

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
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Updated: Oct 2, 2025

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Terahertz Reconfigurable Intelligent Surfaces (RISs) for 6G Communication Links.

Fengyuan Yang1, Prakash Pitchappa1, Nan Wang1

  • 1Institute of Microelectronics, Agency for Science, Technology and Research, Singapore 138634, Singapore.

Micromachines
|February 25, 2022
PubMed
Summary

Reconfigurable intelligent surfaces (RISs) are crucial for 6G networks, but traditional elements fail at terahertz (THz) frequencies. This review explores new tuning mechanisms for THz RIS to enable advanced 6G communication.

Keywords:
6G communicationreconfigurable intelligent surface (RIS)reconfigurable metasurfaceterahertz (THz)

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Telecommunications

Background:

  • The sixth generation (6G) communication network aims for ultra-fast data transmission and ubiquitous connectivity.
  • The terahertz (THz) spectrum offers high frequency and wide bandwidth, ideal for 6G wireless technologies.
  • THz links face challenges like high loss and limited line-of-sight, necessitating solutions like reconfigurable intelligent surfaces (RISs).

Purpose of the Study:

  • To review recent developments in THz RISs for 6G communication.
  • To explore various tuning mechanisms for THz RIS.
  • To discuss future research directions for THz RIS in 6G.

Main Methods:

  • Review of existing literature on THz RIS.
  • Analysis of different tuning mechanisms for RIS active elements.
  • Summarization of recent advancements in THz RIS technology.

Main Results:

  • Traditional active elements (e.g., PIN diodes) are unsuitable for 6G THz RIS due to frequency limitations and high loss.
  • Various tuning mechanisms, including electronic, optical, phase-change materials, and MEMS, are being explored for THz RIS.
  • These mechanisms offer potential for pixel-level amplitude modulation and dynamic beam manipulation in 6G.

Conclusions:

  • THz RIS is a promising technology for overcoming THz link challenges in 6G communication.
  • Further research into novel tuning mechanisms is essential for practical 6G THz RIS implementation.
  • Advancements in THz RIS will be critical for realizing the full potential of 6G networks.