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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

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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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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

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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...
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Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and signal-to-noise ratio for the analyte. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.
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Mass Analyzers: Overview01:13

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The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
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Spectrometer based on a compact disordered multi-mode interferometer.

Ankit Poudel, Pravin Bhattarai, Rijan Maharjan

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    We developed a compact, CMOS-compatible photonic integrated circuit spectrometer. This device utilizes a novel design for efficient light dispersion and analysis, offering high resolution for various applications.

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    Area of Science:

    • Photonics and optical engineering
    • Integrated optics
    • Spectroscopy

    Background:

    • Photonic integrated circuits (PICs) offer miniaturization and scalability for optical systems.
    • Spectrometers are crucial for wavelength analysis across scientific and industrial fields.
    • Silicon-on-insulator (SOI) technology enables advanced photonic device fabrication.

    Purpose of the Study:

    • To present a compact, CMOS-compatible photonic integrated circuit (PIC) based spectrometer.
    • To demonstrate a novel spectrometer design integrating a dispersive array element with a multimode interferometer (MMI).
    • To characterize the performance of the fabricated spectrometer at the 1310 nm wavelength.

    Main Methods:

    • Fabrication of a spectrometer on the silicon-on-insulator (SOI) platform.
    • Integration of a dispersive array element comprising SiO2-filled scattering holes within an MMI.
    • Characterization of the spectrometer's bandwidth and resolution around 1310 nm.

    Main Results:

    • The developed spectrometer is compact and CMOS compatible.
    • The device integrates a dispersive array of SiO2-filled scattering holes within an MMI.
    • The spectrometer exhibits a 67 nm bandwidth, a 1 nm lower bandwidth limit, and a 3 nm peak-to-peak resolution at 1310 nm.

    Conclusions:

    • The presented PIC-based spectrometer offers a promising solution for miniaturized and integrated spectroscopic analysis.
    • The novel design combining scattering holes and MMI achieves competitive resolution and bandwidth.
    • The CMOS compatibility facilitates potential integration into larger electronic-photonic systems.