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Telescope arrays receivers are analyzed for deep-space optical communications between Earth and Mars. It is shown that data rates up to 14 M bits/sec are possible when Mars is at the farthest range from the Earth.
We report the experimental observation of long-sustained GHz electronic oscillations resulting from coupled electron-photon dynamics in ultra-high-Q Si microdisk resonators with CW pumping. Theoretical analysis identifies conditions for steady-state GHz oscillations while suppressing thermal oscillations.
We have used a urethane polymer as cladding to reduce the temperature sensitivity of resonance in high-Q silicon microdisk resonators. A two-order-of-magnitude improvement in resonance stability is demonstrated, and effects on the Q-factor are discussed.
Using the experimental data we show the possibility of sub-microsecond reconfiguration of silicon photonics microresonators through pulse shaping of micro-heater excitation. Also, a novel heater structure based on small microdisk resonators with sub-hundred-nanosecond reconfiguration speed is proposed and investigated theoretically.
We demonstrate on-chip, large-scale arrays of small high-Q microdisk resonators, suitable for both in-plane coupling and out-of-plane (imaging) spectral analysis devices with high resolution (linewidth < 50 pm to 0.5 nm), and large FSR (> 50 nm).
We present a row-action method based on minimization of the L1 norm for improving the accuracy of fluorescent tomography in reconstruction of fluorescent objects. The method is validated using a CW system and milk-based phantoms.
We report high-quality factor (e.g., more than 6,000) silicon resonators operating at high frequencies (~130 MHz) based on phononic crystals which are a new class of materials with artificially-engineerable phononic (or acoustic) properties. The resonators use the complete acoustic (or phononic) band gap of the designed crystal and are fabricated using a CMOS-compatible micromachining technology....
A method for thermal-stabilization of silicon microdisk resonators, based on thermooptic polymer coatings, is proposed. Two orders of magnitude improvement in thermal stability is expected. Effects on Q and major fabrication challenges are discussed.
Integration of silicon microresonators with metallic micro-heaters optimized for low power consumption and fast reconfigurability is experimentally demonstrated. It is shown that narrower heaters improve the performance and also LPCVD SiN over-cladding enhances tuning speed.
We demonstrate high resolution near-field imaging of the optical modes profile in high Q silicon microdisks. A spatial resolution of ~20 nm is obtained by characterizing the perturbative effects of a scanning AFM tip on the microdisk transmission.
A traveling-wave resonator structure with interferometric-coupling scheme is shown to have the capability of supporting both over-coupled and critically-coupled modes, simultaneously. This device is demonstrated in SOI with an integrated microheater to tune its coupling. The application of this device for nonlinear optics is discussed.
We demonstrate sub-wavelength near-field imaging of the optical modes in high Q silicon microdisks. Mode profiles with a spatial resolution of ~20 nm are obtained by characterizing the perturbative effects of a small scanning AFM tip.
We propose and implement a traveling-wave resonator with an interferometric coupling scheme for efficient high-bandwidth nonlinear silicon photonics. By thermal tuning of the interferometer, selective critical coupling for the pump wavelength is achieved.
We have investigated the effect of small perturbations on the optical modes in a silicon microdisk using a NSOM system. The scattering loss and mode coupling due to NSOM tip and cavity interactions are studied.
We investigate the accuracy of fluorescent tomography in imaging deep objects in tissue using an information theoretic analysis of the information content of the measurements. Results are verified by experiments performed on a tissue phantom.
Phononic crystals (PCs) are structures with periodic variations in their mechanical properties. PCs are especially of interest due to possibility of possessing frequency ranges in which propagation of elastic waves is completely prohibited; i.e., complete phononic band gaps (CPBGs). In this paper we first propose a PC slab structure created by a embedding a two dimensional array of void (air) inclusions...
We show the existence of simultaneous frequency band gaps for both photons and phonons in a slab of silicon with a periodic arrangement of cylindrical holes perpendicular to the slab surface with different lattice geometries. The advantages and disadvantages of different lattice structures for integration of photonic and phononic crystal functionalities will be discussed.
An interferometric multiplex coherent anti-Stokes scattering (iMCARS) system that utilizes the supercontinuum of a photonic crystal fiber as both the Stokes and local oscillator sources for broadband heterodyne detection is demonstrated.
We have investigated the effect of small perturbations on the optical modes in a silicon microdisk using a NSOM system. The scattering loss and mode coupling due to NSOM tip and cavity interactions are studied.
A method is proposed for improving the robustness of fluorescent tomography by estimating the likelihood of non-zero concentration at any voxel. Phantom experimental results demonstrate robust reconstruction despite significant modeling mismatch due to optical heterogeneities.
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