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Silicon nanoantennas are used to trap polystyrene nanospheres (20 nm diameter). Fluorescence microscopy is used to monitor trapped particle position as a function of time. The nanoantennas produce subwavelength field enhancement with negligible heat generation.
We employ multipole expansion to analyze radiation modification and light scattering by isolated nanoparticles and by nanoparticle ensembles, unveiling directional emission mediated by magnetic resonance and two types of purely magnetic resonances at optical frequencies.
We demonstrate photodetectors for visible-to-infrared imaging, comprising vertical germanium nanowires on a silicon substrate, with a suspended graphene layer as the top electrical contact. Measured responsivity spectra show peaks that shift with increasing nanowire diameter.
We experimentally demonstrate, for the first time to our knowledge, highly-directional fluorescence emission at visible wavelengths from a silicon metasurface covered with a dye-doped thin film. We provide a physical interpretation based on multipole expansion.
A double nanohole aperture in a gold film is used to trap a polytyrene nanosphere with a diameter of 20 nm. Fluorescence microscopy is used to track the position of the trapped nanosphere.
Silicon has many favorable attributes from both the device physics and manufacturing standpoints, and is therefore the pre-eminent material for micro- and nanoelectronics. Furthermore, due to its transparency at infrared wavelengths, silicon-based integrated photonics play a key role in modern optical communications devices. Silicon-based nano-optical antennas have also attracted much interest recently,...
We fabricate a silicon nanorod-based metasurface that shows vivid colors. Each nanorod supports electric and magnetic dipole modes whose coupling leads to collective resonances. The reflected field is described by a classical coupled dipole model.
We fabricated silicon nanorods on silica substrates, and show that they support electric and magnetic resonances by simulation and experiment. Due to these resonances, the nanorods appear vivid colors when observed by optical microscopy.
We present a superhydrophobic silicon bulls-eye. Water droplets remain centered as they dry, enabling delivery of nanoparticles or molecules to the center. SERS spectra of molecules (R6G) at very low concentrations (10−15 M) are demonstrated.
Optofluidic devices are most commonly fabricated using microfluidic technology into which photonic capability is embedded. Lasers, microscopes, sensors, optical fibers, and lenses can be fabricated with this approach [1]. The application areas of optofluidics include tunable optical devices, biophotonics [2], and more recently solar energy harvesting [3].
We introduce for the first time the implementation of optofluidic lock-in spectroscopy of sub-nanoliter analyte on a microfluidic chip. Two methods, spatial modulation and pneumatic modulation with integrated optofluidic modulator, were demonstrated.
Novel functionalities have been developed through the fusion of optics and microfluidics. We categorize the different possible tuning mechanisms in optofluidics and describe the recent examples in each category.
We introduce for the first time an integrated optofluidic interferometer on a PDMS microfluidic chip. By imaging the local interference patterns inside the chip, both of the fluid pressure and flow rate can be measured.
We introduce a novel tuning mechanism for optofluidic devices by embedding pressure driven actuator inside microfluidic chips. Multiple tunable optofluidic devices remotely controlled by the pressure of air or liquid were demonstrated.
We demonstrate the first microfluidic evanescent dye laser which is based on a solid distributed feedback (DFB) cavity and exhibits a pure single mode lasing emission. The laser is composed of a solid second order circular grating DFB cavity and a PDMS chamber filled with dye solution. The thin layer of dye solution served as the liquid cladding covering the whole surface of solid DFB cavity. The...
We introduce for the first time a tuning mechanism for optofluidic devices by embedding a Micro-Air-Bag (MAB) actuator inside a microfluidic chip. Multiple tunable optical elements controlled through the pressure of compressed air were demonstrated.
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