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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...

Applications of IR Spectroscopy: Overview

Applications of IR Spectroscopy: Overview

The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...

Infrared (IR) Spectroscopy: Overview

Infrared (IR) Spectroscopy: Overview

When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...

IR Spectrum

IR Spectrum

When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...

Raman Spectroscopy: Overview

Raman Spectroscopy: Overview

The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...

Spectrophotometry: Introduction

Spectrophotometry: Introduction

Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...

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Mid-Infrared Photonic Sensors: Exploring Fundamentals, Advanced Materials, and Cutting-Edge Applications.

Muhammad A Butt¹, Marcin Juchniewicz², Mateusz Słowikowski²

¹Warsaw University of Technology, Institute of Microelectronics and Optoelectronics, Koszykowa 75, 00-662 Warsaw, Poland.

Sensors (Basel, Switzerland)

|February 26, 2025

Summary

Mid-infrared (MIR) photonic sensors offer precise chemical and biological detection by analyzing molecular vibrations. This review covers MIR photonics principles, advanced sensor designs, and diverse applications, driving innovation in optical sensing.

Keywords:

biomedical chemical and gas sensing environmental monitoring mid-infrared molecular fingerprint sensors

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Area of Science:

Photonics and optical sensing
Molecular spectroscopy
Chemical and biological detection

Background:

Mid-infrared (MIR) photonic sensors utilize molecular vibrational modes for precise detection.
The 2-20 µm wavelength range is key for MIR light-matter interactions.
Advancements are driven by the need for sensitive, specific, and miniaturized sensors.

Purpose of the Study:

To provide a comprehensive review of Mid-infrared (MIR) photonic sensing.
To explore the fundamental principles and innovative architectures of MIR sensors.
To highlight the broad applications and future potential of MIR photonic technologies.

Main Methods:

Review of core principles of MIR photonics and light-matter interactions.
Examination of advanced sensor architectures, including integrated photonics and optical fibers.
Analysis of current and emerging applications across various sectors.

Main Results:

MIR photonic sensors enable highly specific molecular identification.
Innovative architectures enhance sensor performance (sensitivity, specificity, miniaturization).
Significant impact demonstrated in environmental, medical, industrial, and security fields.

Conclusions:

MIR photonic sensing is a rapidly advancing field with transformative potential.
Further development promises enhanced capabilities for diverse applications.
This technology is crucial for future innovations in optical sensing.