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IR Spectrometers

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...

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Updated: May 12, 2026

Implementation of a Reference Interferometer for Nanodetection

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Sample-Half-Inserted Quantum Interferometer.

Wei Li^1,2, Tao Xie^1,2, Yu-Hang Luo²

¹Hunan Normal University, Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Changsha 410081, China.

Physical Review Letters

|January 2, 2026

Summary

This summary is machine-generated.

Researchers developed a novel sample-half-inserted Hong-Ou-Mandel interferometer (SHOM) that significantly boosts measurement precision. This quantum optics technique enhances Fisher information, enabling attosecond-scale temporal resolutions with fewer repetitions.

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Area of Science:

Quantum optics
Quantum metrology
Interferometry

Background:

Quantum technologies offer unprecedented opportunities for ultrahigh precision metrology.
The Hong-Ou-Mandel (HOM) interferometer enables temporal resolutions on the attosecond scale.
Standard HOM measurements have low Fisher information, requiring extensive repetitions.

Purpose of the Study:

To propose and demonstrate a sample-half-inserted HOM (SHOM) interferometer.
To enhance Fisher information by 5 orders of magnitude in a single interference event.
To convert a distinctive interference structure into a metrological resource.

Main Methods:

Implementation of a sample-half-inserted HOM (SHOM) interferometer.
Introduction of an asymmetric photon-sample interaction.
Measurement of optical path difference using O(10^7) photons.

Main Results:

Achieved an average precision of 4.09 nm (13.63 as) and accuracy of 1.22 nm (4.07 as).
Demonstrated a 5-order-of-magnitude enhancement in Fisher information per trial.
Observed a distinctive dip-bump-dip interference structure.

Conclusions:

SHOM interferometry is an efficient, phase-insensitive approach for quantum-enhanced metrology.
This technique paves the way for practical quantum-enhanced thickness measurement of transparent materials.
SHOM serves as an elegant strategy to improve various quantum device performances.