Journal ArticleDOI
Effect of changes in size and index of refraction on the resonance wavelength of microspheres
Gustav Schweiger,Marion Horn +1 more
TLDR
In this paper, the effect of small changes in size and index of refraction on the resonance wavelength of spherical micro-resonators was investigated, and it was shown that changes in the index of the refraction have two effects: these changes affect the phase jump on the surface and the optical path length in the resonator.Abstract:
Wave theory and geometrical optics are used to investigate the effect of small changes in size and index of refraction on the resonance wavelength of spherical microresonators. It is shown that changes in the index of refraction have two effects: These changes affect the phase jump on the surface and the optical path length in the resonator. Under certain conditions the effect of the external or internal index of refraction becomes negligible. The influence of the order number of the resonance modes is investigated. Finally, the results of the theoretical analyses are applied to calculate the effect of temperature on the resonance wavelength.read more
Citations
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Journal ArticleDOI
Whispering gallery mode sensors
TL;DR: A comprehensive overview of sensor technology exploiting optical whispering gallery mode (WGM) resonances by detailing the fundamental principles and theory of WGMs in optical microcavities and the transduction mechanisms frequently employed for sensing purposes.
Journal ArticleDOI
Optical biosensor based on whispering gallery mode excitations in clusters of microparticles
TL;DR: In this paper, a new concept for an optical biosensor based on whispering gallery mode (WGM) excitations in clusters of spherical microresonators is presented, which offers the advantage to exhibit specific WGM spectra that can be considered as their fingerprint.
Journal ArticleDOI
Whispering gallery mode biosensors in the low- Q limit
TL;DR: In this paper, the suitability of these microscopic cavities for applications in optical (bio-)sensing is explored, based on the low quality (Q) factors of these small cavities, particles with diameters below 6 μm exhibit only q=1 modes, thereby causing a drastic simplification of the WGM spectrum.
Journal ArticleDOI
Whispering gallery modes of microspheres in the presence of a changing surrounding medium: A new ray-tracing analysis and sensor experiment
TL;DR: A simple plane wave, ray tracing approach was used to derive approximate equations for the dielectric microsphere whispering gallery mode (WGM) resonant wavenumber and quality factor, as dependent on the surrounding medium's refractive index.
Journal ArticleDOI
Temperature sensing by using whispering gallery modes with hollow core fibers
TL;DR: In this article, the authors describe temperature sensing by hollow core fibers using whispering gallery modes of a spherical microresonator, where light from a tunable laser was coupled into the input end of the hollow core fiber.
References
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Journal ArticleDOI
Protein detection by optical shift of a resonant microcavity
TL;DR: In this article, an optical biosensor with unprecedented sensitivity for detection of unlabeled molecules is presented. But the method relies on the use of a dielectric microparticle (whispering gallery modes) as the physical transducing mechanism.
Journal ArticleDOI
Shift of whispering-gallery modes in microspheres by protein adsorption
TL;DR: The theoretical shift for adsorption of a single protein is found to be extremely sensitive to the target region, with adsor adaptation in the most sensitive region varying as 1/R(5/2).
Journal ArticleDOI
Narrow-line-width diode laser with a high-Q microsphere resonator
V.V. Vassiliev,Vladimir L Velichansky,Vladimir S. Ilchenko,Michael L. Gorodetsky,Leo W. Hollberg,A.V. Yarovitsky +5 more
TL;DR: In this article, a new modification of external optical feedback OFB was used to narrow the line of a diode laser DL, where a "whispering gallery" WG mode of a high-Q microsphere was excited by means of frustrated total internal reflection.
PatentDOI
Perturbation approach to resonance shift of whispering gallery modes in a dielectric microsphere as a probe of a surrounding medium
TL;DR: In this paper, a first-order perturbation theory for transverse electric and transverse magnetic photonic resonance modes in a dielectric microsphere was developed, which is similar to the one widely used in quantum mechanics.
Journal ArticleDOI
Highly efficient optical power transfer to whispering-gallery modes by use of a symmetrical dual-coupling configuration.
Ming Cai,Kerry J. Vahala +1 more
TL;DR: It is shown that the low intrinsic cavity loss and the symmetrical dual-coupling structure are crucial for obtaining the high coupling efficiency.
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