IEEE Journal of Selected Topics in Quantum Electronics · 2006 · 119 citations · 15 references
EngineeringBioengineeringBiomedical EngineeringOpticsPhotonicsSensorsBiomedical SensorsOptical BiosensingOptical BiosensorsOptical SensingOptical SensorsActive Optical ResonatorsChemical Optical SensorsLight-induced Refractive Index ChangeMicro-optical SensorsRefractive Index Sensing
Active microcavities can achieve greatly improved sensitivity compared with passive high‑Q microcavities. The study proposes an active optical sensor based on a microcavity with gain. The sensor uses a gain‑doped microcavity to enhance resonance response. Our analysis shows that the active sensor achieves a 10⁴‑fold narrower resonance linewidth than a passive microcavity, enabling detection of low concentrations of chemicals or biomolecules and sensitivity to refractive index changes on the order of 10⁻⁹.
We propose an active optical sensor based on a microcavity with gain. Greatly improved sensitivity can be achieved in active microcavities as compared with passive high-Q microcavities. We show that an active sensor using a gain-doped microsphere can provide 10/sup 4/-fold narrower resonance linewidth than does a passive microcavity in the transmission spectrum. Such highly sensitive microcavity optical sensors can be used to detect low concentrations of chemicals or biomolecules in their surroundings. Our analysis shows that this type of compact active microcavity is sensitive to an effective refractive index change of the order of 10/sup -9/.
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Ultra-high-Q toroid microcavity on a chip
Tobias J. Kippenberg, S. M. Spillane, Kerry J. Vahala · Nature · 2003 · 2.2K citations
M.J. Adams · Optica Acta International Journal of Optics · 1984 · 1.1K citations
Natural Sciences, Physics, Optics +13
Protein detection by optical shift of a resonant microcavity
Frank Vollmer, Dieter Braun, Albert Libchaber et al. · Applied Physics Letters · 2002 · 902 citations