Integrated Nanophotonic Waveguide-Based Devices for IR and Raman Gas Spectroscopy
Abstract
:1. Introduction
2. Efforts toward Miniaturization
2.1. Light Sources
2.1.1. IR Absorption Spectroscopy
2.1.2. Raman Spectroscopy
2.2. Waveguides
2.3. Cladding
2.4. Detectors: Single Pixel, Arrays, Spectrometers
3. Waveguide-Enhanced IR Absorption Spectroscopy
3.1. Configurations and Integration
3.1.1. On-Chip Light Sources and Passive Waveguide Integration
3.1.2. Passive Waveguide and Detector Integration
3.1.3. Integration of All Three Components
3.2. Applications
3.2.1. Air-Clad
3.2.2. Cladding
4. Waveguide-Enhanced Raman Spectroscopy
4.1. Configuration and Integration
4.2. Applications
4.2.1. Air-Clad
4.2.2. Clad/Functionalized
5. Summary of Current Technology–Comparison with Refractive Index Sensing
6. Outlook and Future Perspectives
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Acknowledgments
Conflicts of Interest
References
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Strucuture | Cladding | Analyte-LOD | Γ/EFR | Losses -λ | Advantages -Disadvantages | Ref. |
---|---|---|---|---|---|---|
Strip Waveguides | ||||||
Polysilicon strip waveguides over SiO2/Si3N4 | Air | CO2 500 ppm | 14–16% TE (EFR) | 3.98–5.6 dB/cm 4.23 μm | Simple with moderate confinement factor. Single wavelength measurement. | [174] |
Silicon strip waveguide | Air | CH4-C2H2 <50,000 ppm | 13% TE (EFR) | 1.74 dB/cm 3–3.3 μm | Simple design and fabrication. Low losses. Moderate confinement factor. High LOD. Wavelength Scanning measurement. | [175] |
Silicon strip waveguide | Air | CH4 < 100 ppm | 15% TM (Γ) | Not reported 1.65 μm | Fully integrated chip with a 20-cm-long silicon waveguide. wavelength-scanning measurement. | [157] |
Silicon strip waveguides on silica | Air | CH4 100 ppm | 25.5% TM (Γ) | 2 dB/cm 1.65 μm | High confinement factor for a strip waveguide. Relatively low losses. Low LOD. Wavelength scanning measurement. | [176] |
Germanium on silicon strip waveguides | MS- HDMS-water | Toluene 7 ppm | 1% (EFR) | 2.5–5 dB/cm 6.5–7.5 μm | 100–1000× preconcentration. High LOD. Wavelength Scanning measurement. | [177] |
Chalcogenide strip spiral waveguide | Air | CH4 25000 ppm | 8% (EFR) | 7 dB/cm 3.28–3.34 μm | Low confinement factor and high losses. Not CMOS compatible. Wavelength scanning measurement. | [178] |
Chalcogenide strip waveguide on silica and CaF2 | Water | Phenylethyl amine 1800 ppm (mol/mol) (0.1 mol/L) (12 g/L) | 5–15% (EFR) | 0.4–1 dB/cm 1.52–1.56 μm | Low losses. Not CMOS compatible, low confinement factor. Single wavelength measurement. | [179] |
Chalcogenide strip spiral waveguide | Air | CH4 10,000 ppm | 12.5% (Γ) | 8 dB/cm 3.31 μm | Waveguide and detector integrated on the same chip. Single wavelength measurement. | [156] |
TiO2 rib porous waveguide on SiO2 | Air | C2H2 <100,000 ppm | 26% TE (Γ) | 2.2–8.5 dB/cm 1.5–1.6 μm | Simple and inexpensive. Highest confinement factor for rib waveguide. Strong fringes. High LOD. Wavelength scanning measurements | [180] |
Suspended Waveguides | ||||||
Polysilicon-on- Si3N4 membrane over Si/SiO2 walls | Air | CO2 5000 ppm | 19.5% (Γ) | Not reported 4.23 μm | Complicated fabrication, moderate improvement in confinement factor. Single wavelength measurement. 1 cm long. | [84] |
Silicon beam on pillars | Air | CO2 < 1000 ppm | 44% (Γ) | 3–4 dB/cm 4.24 μm | Sophisticated fabrication and moderate losses. High confinement factor. Few wavelength measurements. | [73] |
Suspended tantala rib waveguide | Air | C2H2 7 ppm | 107% TM (Γ) | 6.8 dB/cm 2.55 μm | Highest reported confinement factor. Low fringes. Moderate losses. Low LOD. Wavelength scanning measurements. | [69] |
Suspended ring resonator | Air | CO2 1000 ppm | 50% TE (Γ) | Not reported 4.23 μm | High confinement factor. Original but complicated measurement based on dispersion spectroscopy. Wavelength scanning measurements. Ring length935 μm. | [181] |
Photonic Crystals | ||||||
Photonic crystal | Air | CH4 > 100 ppm | Not reported ng = 30 | Not reported 1660–1670 nm | High losses restrict the length to 300 μm. Wavelength scanning measurements. | [182] |
Photonic crystal slot waveguide | Air | TEP 10 ppm | Not reported | Not reported 3.43 μm | No spectroscopic measurements were made. Changes in temperature and refractive index could not be ruled out. 800 μm long. | [183] |
SOI holey photonic crystal waveguide | Air | Ethanol 150 ppb | 17% (ERF) ng = 73 | Not reported 3.4 μm | 9 mm long photonic crystal. Due to single wavelength measurement, the results are susceptible to environmental changes. | [184] |
Photonic crystal slot waveguide | PDMS-water | Xylene 100 ppb (v/v) (86 μg/L) | Not reported ng = 20 | Not reported 1.69 μm | Low LOD, small differences between fabrication and design have significant effects. 300 μm long. Spectroscopic measurement. | [185] |
SOI Photonic crystal waveguide | SU8-water | Xylene 1 ppb Trichloroethane 10 ppb (v/v) | Not reported ng= 23–33 | Not reported 1.640–1.680 μm | 300μm long. Low LOD. Sigle wavelength measurement for each analyte. The whole device includes a Y-junction combiner, PCW, and MMI. | [186] |
Self-standing GaINP Photonic crystal | Air | C2H2 < 50,000 ppm | 100% TM 31% TE (Γ) ng = 1.5–6.7 | Not reported 1520–1570 μm | High confinement factor. 1.5 mm long photonic crystal waveguide. High LOD. Wavelength scanning measurements. | [80] |
InGaAs self-standing holey photonic crystal | Air | NH3 5 ppm | 12% (EFR) ng = 39.3 | 39.1 dB/cm 6.15 μm | 1 mm long. No spectroscopy measurement was presented. The results are susceptible to environmental changes. | [63] |
Subwavelength Grating | ||||||
Subwavelengh grating waveguides | Air | NH3 5 ppm | 10% (EFR) | 6.15 μm ng = 14.8 4.1 dB/cm | 3 mm long. No spectroscopy results were presented. The results are susceptible to environmental changes. | [63] |
Structure | Cladding | Losses (αp)/λ | Analyte | Γ/ Polarization | Length | LOD | Ref. |
---|---|---|---|---|---|---|---|
Si3N4 rib waveguide | HCSFA2 FPOL PMBTTS O1pBPAF | 1–5 dB/cm 1060–1300 nm | DMMP | Not reported 1064 TM | Spiral length not specified * | 3–1000 ppb | [222] |
Si3N4 rib waveguide | HCSFA2 | 1–2.5 dB/cm 1060–1200 nm | DMMP DEMP TMP TEP | Not reported 832 nm TM | 9.6 mm | 5, 10, 50, 50 ppb | [221] |
Si3N4 rib wavegudies | HCSFA2 | 2 dB/cm 980–1600 nm | EA MeS DMSO | 25% TE 1064 nm | 9.6 mm | 1.8 ppm 1 ppm 24 ppb | [193] |
Si3N4 double slot waveguide | MS-HMDS | Not reported | isopropanol | 32% TE 785 nm | 10 mm | 808 ppm | [203] |
Si3N4 slot waveguide | MS-HMDS | 5.6 dB/cm | isopropanol, acetone, ethanol | 37% TE 785 nm | 8 mm | 60, 600, 160 ppm | [194] |
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Alberti, S.; Datta, A.; Jágerská, J. Integrated Nanophotonic Waveguide-Based Devices for IR and Raman Gas Spectroscopy. Sensors 2021, 21, 7224. https://doi.org/10.3390/s21217224
Alberti S, Datta A, Jágerská J. Integrated Nanophotonic Waveguide-Based Devices for IR and Raman Gas Spectroscopy. Sensors. 2021; 21(21):7224. https://doi.org/10.3390/s21217224
Chicago/Turabian StyleAlberti, Sebastián, Anurup Datta, and Jana Jágerská. 2021. "Integrated Nanophotonic Waveguide-Based Devices for IR and Raman Gas Spectroscopy" Sensors 21, no. 21: 7224. https://doi.org/10.3390/s21217224