Nanophotonics: principle and application. Khai Q. Le Lecture 11 Optical biosensors
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1 Nanophotonics: principle and application Khai Q. Le Lecture 11 Optical biosensors
2 Outline Biosensors: Introduction Optical Biosensors Label-Free Biosensor: Ringresonator Theory Measurements: Bulk sensing Measurements: Surface sensing Label-Free Biosensor: Surface Plasmon Biosensors Surface plasmon resonance biosensors Surface plasmon interference biosensors Localized surface plasmon resonance biosensors
3 Outline Biosensors: Introduction Optical Biosensors Label-Free Biosensor: Ringresonator Theory Measurements: Bulk sensing Measurements: Surface sensing Label-Free Biosensor: Surface Plasmon Biosensors Surface plasmon resonance biosensors Surface plasmon interference biosensors Localized surface plasmon resonance biosensors
4
5 Strong Growth Predicted for Biosensors Market
6
7 Why biosensors? measure biomolecules: Proteins DNA Cells applications in: Diagnostics Drug research Prof. Peter Bienstman s Internal tutorial
8 Labeled vs labelfree
9 What is labeling? attach fluorescent marker to biomolecule + = measure signal under laser excitation laser signaal Prof. Peter Bienstman s Internal tutorial
10 Label-free sensing P ΔP Δλ 1.55 μm Prof. Peter Bienstman s Internal tutorial
11 Labeling Pro: very sensitive (down to single molecule) Con: very ad-hoc expensive can disturb biological processes Prof. Peter Bienstman s Internal tutorial
12 Less sensitive Label-free but: prospective for more integration on chip Prof. Peter Bienstman s Internal tutorial
13 What makes a good sensor? Prof. Peter Bienstman s Internal tutorial
14 Bulk sensitivity nm/riu Prof. Peter Bienstman s Internal tutorial
15 Adlayer sensitivity (surface sensing) nm/nm (assume n known) Prof. Peter Bienstman s Internal tutorial
16 Sensitivity as defined here: purely optical parameter Prof. Peter Bienstman s Internal tutorial
17 Detection limit detection limit = noise / sensitivity e.g. bulk: 5 pm / (1 pm/riu) = 5 RIU Prof. Peter Bienstman s Internal tutorial
18 Detection limit surface sensing Concentration: ng/ml Surface coverage: pg/mm2 (calculation assumes homogeneous mixing, 100% coverage, ) Prof. Peter Bienstman s Internal tutorial
19 Intensity Intensity Approaches to enhance biosensing performance 1. Enhancing sensitivity Δλ Δλ Wavelength Wavelength low sensitivity high sensitivity
20 Intensit y Approaches to enhance biosensing performance 2. Enhancing selectivity P high Q-factor (high selectivity) P Δλ λ FWHM Δλ λ Wavelength low Q-factor (low selectivity)
21 Outline Biosensors: Introduction Optical Biosensors Label-Free Biosensor: Ringresonator Theory Measurements: Bulk sensing Measurements: Surface sensing Label-Free Biosensor: Surface Plasmon Biosensors Surface plasmon resonance biosensors Surface plasmon interference biosensors Localized surface plasmon resonance biosensors
22 Optical Label-free sensing Ring resonator (peak shift) Surface plasmons (peak shift) Surface plasmon resonances Surface plasmon interferences Localized surface plasmon resonances (nanosensor) Waveguide sensing (interferometry) Photonic Crystals Peak shift from defect Measure band gap change Interferometry
23 Biosensors Waveguide sensors :Microring Cavities Evanescent field sensing Technology and principle well understood Surface modification and biomolecule immobilisation are the biggest issues Surface Plasmon Sensor Sensing with surface plasmon modes Novel technology and principle Surface modification and biomolecule immobilisation well understood Dr. Peter Debackere s Internal tutorial
24 Outline Biosensors: Introduction Optical Biosensors Label-Free Biosensor: Ringresonator Theory Measurements: Bulk sensing Measurements: Surface sensing Label-Free Biosensor: Surface Plasmon Biosensors Surface plasmon resonance biosensors Surface plasmon interference biosensors Localized surface plasmon resonance biosensors
25 Incoupling Port Theory resonance n eff D m Drop Port Pass port flow with biomolecules microring cavity biosensor matching biomolecule (analyte) biorecognition element (ligand) functional monolayer Dr. Peter Debackere s Internal tutorial
26 Theory Intensity Measurement Mode Monochromatic Input, monitor output power as a function of refractive index P Advantage : real-time interaction registration Disadvantage : limited range Wavelength Interrogation Mode Broadband input, monitor resonance wavelength as a function of refractive index Advantage: easy to multiplex Disadvantage: slower detection method Dr. Peter Debackere s Internal tutorial Sensitivity Increases with increasing Q factor of the ring Q resonance 3 db P
27 Measurement Setup Light from tunable laser Flow Cell Light to photodetector SiO 2 Si Temperaturecontrol Results presented here: Static measurements : zero flow rate Flow cell dimensions Ø~2mm 2 Towards microfluidic setup: Continuous flow with syringe pump Flow cell dimensions Ø~100μm 2 Dr. Peter Debackere s Internal tutorial
28 Bulk refractive index sensing No surface chemistry involved Different salt concentrations Good repeatability (small variations around mean value) resonance wavelength shift [nm] Sensitivity shift of 70nm/RIU λmin= 5pm n min =1*10-5 RIU refractive index [RIU] Dr. Peter Debackere s Internal tutorial
29 Surface Sensing Biotin/Avidin biotin buffer ph7,4 resonator avidin concentration resonator buffer ph7,4 resonator avidin biotin output [au] P λ wavelength [nm] Dr. Peter Debackere s Internal tutorial
30 Surface Sensing Biotin/Avidin resonance wavelength shift [nm] avidin concentration [μg/ml] High avidin concentrations: saturation Low avidin concentrations: quantitative measurements λ min = 5pm 50ng/ml Dr. Peter Debackere s Internal tutorial
31 Outline Biosensors: Introduction Optical Biosensors Label-Free Biosensor: Ringresonator Theory Measurements: Bulk sensing Measurements: Surface sensing Label-Free Biosensor: Surface Plasmon Biosensors Surface plasmon resonance biosensors Surface plasmon interference biosensors Localized surface plasmon resonance biosensors
32 Theory: Surface Plasmons Evanescent TM polarized electromagnetic waves bound to the surface of a metal Benefits for Biosensing High fields near the interface are very sensitive to refractive index changes Gold is very suitable for biochemistry From source Prism To detector R Gold Dr. Peter Debackere s Internal tutorial
33 Theory Bulky surface plasmon biosensor Fully integrated lab-on-chip solution in Silicon-on-Insulator Dr. Peter Debackere s Internal tutorial
34 Configurations Otto Configuration Kretschman Configuration Resonant Mirror Configuration Fiber optics Sensors Waveguide Integrated SPR LSPR nanosensor
35 Otto : Design Which metal? Thickness of the Metal? Dr. Peter Debackere s Internal tutorial
36 Response Curves Angular Response Spectral Response Au thickness 44 nm, resonance angle degrees, resonant wavelength 650 nm Dr. Peter Debackere s Internal tutorial
37 Response Curves Angular Response Spectral Response 657 nm nm Au thickness 44 nm, resonance angle degrees, resonant wavelength 650 nm Dr. Peter Debackere s Internal tutorial
38 Response Curves Angular Response Spectral Response 1610 nm nm Au-layer thickness 38 nm resonance angle degrees resonance wavelength 1600 Dr. Peter Debackere s Internal tutorial
39 Sensitivity BK 7 Glass Prism Silicon Prism Sensitivity [nm/riu] Sensitivity [nm/riu] spectral half width spectral half width Wavelength shift [nm/riu] Wavelength shift [nm/riu] Wavelength [um] Sensitivity total contribution FRESNEL CAMFR Sensitivity total contribution Wavelength [um] Dr. Peter Debackere s Internal tutorial
40 Outline Biosensors: Introduction Optical Biosensors Label-Free Biosensor: Ringresonator Theory Measurements: Bulk sensing Measurements: Surface sensing Label-Free Biosensor: Surface Plasmon Biosensors Surface plasmon resonance biosensors Surface plasmon interference biosensors Localized surface plasmon resonance biosensors
41 Theory : Concept Surface Plasmon Interferometer Sample medium 5 μm Au Si SiO 2 Si 4 μm 1 μm.22μm 10 μm Dr. Peter Debackere s Internal tutorial
42 Simulation : Intensity Measurement Constructive Interference Dr. Peter Debackere s Internal tutorial
43 Simulation : Intensity Measurement Destructive Interference Dr. Peter Debackere s Internal tutorial
44 Simulation : Intensity Measurement Optimalisation of Design Si thickness = 160 nm Length = 10 m Si thickness = 100 nm Length = m Dr. Peter Debackere s Internal tutorial
45 Simulation : Intensity Measurement Sensitivity Analysis 10-5 Change in the refractive Sensitivity index that causes a drop or rise in the transmission of 0.01 db Dr. Peter Debackere s Internal tutorial
46 Simulation : Intensity Measurement Sensitivity Analysis Comparison Prism Coupled SPR 1 x 10-6 Grating Coupled SPR 5 x 10-5 MZI SOI Sensors 7 x 10-6 Integrated SPR LIC 5 x 10-6 BUT Dimensions are two orders of magnitude smaller Dr. Peter Debackere s Internal tutorial
47 Simulation: Wavelength Interrogation Shift of the spectral minimum Shift of the spectral minimum as a function of the bulk refractive index Dr. Peter Debackere s Internal tutorial
48 Simulation: Wavelength Interrogation Sensitivity to adlayers For n=1.34 adlayer 6 pm/nm Dr. Peter Debackere s Internal tutorial
49 Measurement Setup Side View Top View Dr. Peter Debackere s Internal tutorial
50 Measurement Results Transmission (db) Transmission as a function of wavelength Measurement μm Au O2 toplayer Transmission [db] Compared to Theory Qualitative Agreement between experiment and theory Quantitative Need for a better fabrication process Transmission as a function of wavelength Simulation Wavelength (nm) Dr. Peter Debackere s Internal tutorial -18 Wavelength [nm]
51 Outline Biosensors: Introduction Optical Biosensors Label-Free Biosensor: Ringresonator Theory Measurements: Bulk sensing Measurements: Surface sensing Label-Free Biosensor: Surface Plasmon Biosensors Surface plasmon resonance biosensors Surface plasmon interference biosensors Localized surface plasmon resonance biosensors
52 Localized surface plasmon resonance (LSPR) biosensor LSPR sensing streptavidin binding to biotin LSPR biosensor consists of 3 major components Plasmonic surface: signal transduction Passivating layer: reduces nonspecific binding Probe layer: recognize specific targets
53 Localized surface plasmon resonance (LSPR) biosensor LSPR sensing streptavidin binding to biotin Ag Δλ=12.7nm Single nanoparticle LSPR biosensor
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