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Related Concept Videos

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...

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Terahertz Imaging and Characterization Protocol for Freshly Excised Breast Cancer Tumors
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Terahertz quasi time domain spectroscopy.

Maik Scheller1, Martin Koch

  • 1Institut für Hochfrequenztechnik, Technische Universität Braunschweig, Schleinitzstr. 22, 38106 Braunschweig, Germany. maik.scheller@ihf.tu-bs.de

Optics Express
|November 13, 2009
PubMed
Summary

A novel terahertz (THz) time domain spectroscopy (TDS) system using a standard photomixer setup and a low-cost laser diode was developed. This quasi-TDS system achieves a 600 GHz bandwidth for various THz applications.

Area of Science:

  • Optoelectronics
  • Spectroscopy
  • Laser Physics

Background:

  • Terahertz (THz) time domain spectroscopy (TDS) is a powerful technique for material characterization.
  • Traditional THz-TDS systems often require specialized and expensive components.
  • Semiconductor lasers with equidistant frequency spacing offer potential for novel spectroscopic applications.

Purpose of the Study:

  • To theoretically and experimentally demonstrate a quasi-THz time domain spectroscopy (TDS) system.
  • To utilize a standard photomixer setup with equidistant frequency spacing of semiconductor laser modes.
  • To enable both time and frequency domain data processing for THz applications.

Main Methods:

  • Theoretical modeling of signal generation in a photomixer with mode-locked semiconductor lasers.

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  • Experimental setup utilizing a low-cost, multimode semiconductor laser diode.
  • Characterization of the system's bandwidth and performance in quasi-TDS mode.

    • Main Results:

    • Successful detection of THz signals using a standard photomixer setup with equidistant laser modes.
    • Demonstration of a quasi-TDS system capable of both time and frequency domain analysis.
    • Achieved system bandwidth of 600 GHz using a low-cost multimode laser diode.

    Conclusions:

    • The proposed quasi-TDS system offers a cost-effective alternative for THz spectroscopy.
    • The system is suitable for classical THz-TDS application scenarios.
    • This approach broadens the accessibility of THz time-domain spectroscopy.