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IR Frequency Region: X–H Stretching

IR Frequency Region: X–H Stretching

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 the 3500–3100 cm−1 range. Even though both O−H and N−H bonds vibrate at a similar...

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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

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Cost-effective time-stretch terahertz recorders, using 1550 nm probes.

Christelle Hanoun, Eléonore Roussel, Christophe Szwaj

|May 4, 2026

Summary

This study introduces a cost-effective method for terahertz (THz) waveform recording using time-stretch electro-optic detection. By employing 1550 nm probes and standard fiber optics, the technique significantly reduces hardware costs while enhancing data acquisition capabilities for THz time-domain spectroscopy.

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Area of Science:

Terahertz (THz) spectroscopy
Electro-optic detection
Photonics and optical engineering

Background:

Time-stretch electro-optic detection enables high-speed, single-shot THz waveform recording, crucial for accelerator physics and THz time-domain spectroscopy.
High costs associated with fast analog-to-digital converters (ADCs) and oscilloscopes have limited the widespread adoption of this technique.
Increased sample requirements per waveform further escalate the cost, hindering broader application.

Purpose of the Study:

To develop a cost-effective THz time-stretch recorder.
To decrease the required oscilloscope bandwidth and/or increase recorded samples within a budget.
To leverage the high dispersion of 1550 nm fiber optic probes for improved performance.

Main Methods:

Utilized 1550 nm probe lasers and standard telecommunication dispersion compensation fibers.
Designed an experimental setup using commercially available, standard optical components.
Tested the system with 100 ps THz pulses (≈0.75 THz bandwidth) from the SOLEIL synchrotron facility.

Main Results:

Achieved a significant reduction in cost by using lower-bandwidth oscilloscopes (1-3 GHz).
Recorded THz waveforms with an unprecedented time-bandwidth product of ≈100 over a ≈130 ps window.
Demonstrated high sensitivity, detecting birefringence in the crystal down to 0.5 mrad.

Conclusions:

The developed THz time-stretch recorder offers a cost-effective solution for high-fidelity THz waveform acquisition.
This approach enhances the feasibility of table-top THz time-domain spectroscopy and other applications.
The use of 1550 nm probes and standard components opens new avenues for accessible THz technology.