Journal ArticleDOI
Ultracompact biochemical sensor built with two-dimensional photonic crystal microcavity.
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TLDR
By measuring the resonant wavelength of a two-dimensional photonic crystal microcavity, a time-resolved sensing capability is demonstrated that can detect the change in refractive index of 0.002.Abstract:
We report an experimental demonstration of an ultracompact biochemical sensor based on a two-dimensional photonic crystal microcavity. The microcavity, fabricated on a silicon-on-insulator substrate, is designed to have a resonant wavelength (λ) near 1.5 µm. The transmission spectrum of the sensor is measured with different ambient refractive indices ranging from n=1.0 to n=1.5. From observation of the shift in resonant wavelength, a change in ambient refractive index of Δn=0.002 is readily apparent. The correspondence between absolute refractive index and resonant wavelength agrees with numerical calculation to within 4% accuracy. The evaporation of water in a 5% glycerol mixture is also used to demonstrate the capability for in situ time-resolved sensing.read more
Citations
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Journal ArticleDOI
Tunable dark modes in one-dimensional "diatomic" dielectric gratings.
Bo Zeng,Arka Majumdar,Feng Wang +2 more
TL;DR: This paper theoretically investigates a new class of subwavelength 1D gratings, namely "diatomic" gratings with two nonequivalent subcells in one period, and utilizes their intrinsic dark modes to achieve robust ultra high Q resonances.
Journal ArticleDOI
Hollow Core Waveguide Sensor Array Based on a Macroporous Silicon Membrane Structure
TL;DR: In this article, a liquid core microsensor array based on a macroporous silicon membrane structure is proposed. But the authors focus on the optical resonance characteristics formed by reflecting mirrors on the pore sidewalls.
Journal ArticleDOI
Patterning of SiO2 nanoparticle-PMMA polymer composite microstructures based on soft lithographic techniques
TL;DR: In this article, pattern transfer of silicon dioxide nanoparticles-polymethylmethacylate (PMMA) nanocomposite was investigated using two such soft lithographic techniques, micro molding in capillaries (MIMIC) and micro transfer molding (@mTM) using an elastomeric stamp in Polydimethyl siloxane (PDMS).
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Optical Detection of Target Molecule Induced Aggregation of Nanoparticles by Means of high-Q Resonators
Jeremy Witzens,Michael Hochberg +1 more
TL;DR: A novel scheme to detect target molecule induced, or suppressed, aggregation of nanoparticles, using high-Q optical resonators to trap gold nanoparticle clusters and to detect their presence via a shift in the resonance wavelength is theoretically investigated.
Journal ArticleDOI
Design of a compact photonic crystal sensor
TL;DR: In this article, a photonic crystal (PC) sensing element consisting of dielectric cylinders with varying radius introduced along and directions of the crystal is presented, where the peak wavelength shifts to the high frequency region when only six cylinders are filled with analytes.
References
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Book
CRC Handbook of Chemistry and Physics
TL;DR: CRC handbook of chemistry and physics, CRC Handbook of Chemistry and Physics, CRC handbook as discussed by the authors, CRC Handbook for Chemistry and Physiology, CRC Handbook for Physics,
Journal ArticleDOI
Block-iterative frequency-domain methods for Maxwell’s equations in a planewave basis
TL;DR: A fully-vectorial, three-dimensional algorithm to compute the definite-frequency eigenstates of Maxwell's equations in arbitrary periodic dielectric structures, including systems with anisotropy or magnetic materials, using preconditioned block-iterative eigensolvers in a planewave basis is described.
Journal ArticleDOI
A Porous Silicon-Based Optical Interferometric Biosensor
Victor Lin,Kianoush Motesharei,Kianoush Motesharei,Keiki-Pua S. Dancil,Keiki-Pua S. Dancil,Michael J. Sailor,Michael J. Sailor,M. Reza Ghadiri,M. Reza Ghadiri +8 more
TL;DR: A biosensor has been developed based on induced wavelength shifts in the Fabry-Perot fringes in the visible-light reflection spectrum of appropriately derivatized thin films of porous silicon semiconductors based on Binding of molecules induced changes in the refractive index of the porous silicon.
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Linear waveguides in photonic-crystal slabs
TL;DR: In this article, a systematic analysis of waveguides in photonic-crystal slabs is presented, and the considerations that must be applied to achieve single-mode guided bands in these systems are discussed.
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Principles of biosensing with an extended coupling matrix and surface plasmon resonance
TL;DR: In this paper, the surface plasmon resonance angle shifts are calculated as a function of the amount of organic material in the interaction matrix and the influence of physical parameters, such as matrix thickness and wavelength of the light, on the expected performance is considered.