Frequency Locking Optical Whispering Evanescent Resonator
Frequency Locking Optical Whispering Evanescent Resonator - Related Videos
12:18
Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
0 Views •
Cited by 35 •
2013
The customized techniques developed in our lab to build microwave photonics systems based on ultra-high Q whispering gallery mode resonators are presented. The protocols to obtain and characterize these resonators are detailed, and an explanation of some of their applications in microwave photonics is given.
12:21
Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
0 Views •
Cited by 1 •
2016
Efficient generation of nonlinear phenomena related to third order optical non-linear susceptibility Χ(3) interactions in triply resonant silica microspheres is presented in this paper. The interactions here reported are: Stimulated Raman Scattering (SRS), and four wave mixing processes comprising Stimulated Anti-stokes Raman Scattering (SARS).
08:32
Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors
0 Views •
Cited by 7 •
2013
A high-sensitivity photonic micro sensor was developed for electric field detection. The sensor exploits the optical modes of a dielectric sphere. Changes in the external electric field perturb the sphere morphology leading to shifts in its optical modes. The electric field strength is measured by monitoring these optical shifts.
10:21
Evanescent Field Based Photoacoustics: Optical Property Evaluation at Surfaces
0 Views •
Cited by 2 •
2016
Here we present a protocol to estimate material and surface optical properties using the photoacoustic effect combined with total internal reflection. This technique evanescent field-based photoacoustics can be used to create a photoacoustic metrology system to estimate materials' thicknesses, bulk and thin film refractive indices, and explore their optical properties.
08:53
Label-free Single Molecule Detection Using Microtoroid Optical Resonators
0 Views •
Cited by 32 •
2015
We have developed a label-free biosensing system based on optical resonator technology known as Frequency Locking Optical Whispering Evanescent Resonator (FLOWER) that is capable of detecting single molecules in solution. Here the procedures behind this work are described and presented.
FAQs
The evanescent field extends only into the surrounding medium near the resonator surface, so interactions in that region can influence the circulating optical mode. This spatial sensitivity helps distinguish surface-associated events from changes occurring farther away in the sample. In bioengineering, that behavior supports monitoring biomolecular binding and other biological-interface interactions without requiring a fluorescent or other detection label.
Frequency feedback continuously adjusts the laser so it remains aligned with an optical resonance as conditions change. Rather than allowing the laser and resonance to drift apart, the feedback maintains a stable measurement relationship while binding or refractive-index changes shift the resonance. This improves real-time observation and makes the resulting optical response more suitable for quantitative biosensor studies.
Two changes identified for this system are binding events near the surface and variations in the surrounding medium’s refractive index. Either can alter the optical conditions experienced by the resonator and move its resonance. Consequently, the measured shift can report biomolecular interactions at an interface or changes in fluid composition, depending on the bioengineering experiment.
The measurement follows optical changes caused by the interaction itself, rather than relying on a separately detected marker. When material binds near the resonator or changes the local refractive index, the resonance shifts and the locked optical system tracks that response. This label-free format is useful when researchers want to observe biomolecular or cell-related interactions directly in real time.
A measurement begins by coupling light into the resonator and establishing the relevant optical resonance. The feedback system then keeps the laser frequency locked to that resonance while the surrounding sample is monitored. Researchers relate subsequent resonance shifts to surface binding, cell-related interactions, or fluid-composition changes, allowing the optical response to be followed continuously during the experiment.
Bioengineers may choose it when they need label-free, real-time information about biomolecular binding or other changes at a biological interface. Its combination of surface-sensitive evanescent detection and frequency stabilization supports quantitative biosensor development rather than a single end-point observation. The same approach can also help evaluate how biological interactions alter an optical sensing environment.
The system can provide time-dependent information about resonance changes associated with biomolecular binding, cell-related interactions, and fluid composition. Because feedback maintains the laser near resonance, researchers can follow these changes as they occur rather than relying only on an initial and final comparison. The resulting measurements support quantitative studies of biological interfaces and sensing performance.