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Today lighting efficiency and quality are essential to wide-scale utilization of semiconductor lighting technologies. To address these challenges, we develop and demonstrate new classes of color-conversion LEDs1,2 integrating nanophosphors of semiconductor quantum dots for high-photometric quality3 and those enhanced using excitonics (controlling exciton-exciton interactions) through Förster-type...
Red, green and blue distributed feedback lasers based on dense colloidal CdSe quantum dot thin films were optically pumped in quasi-steady state. The red lasers showed 32% internal quantum efficiency and 400 µW output power.
Here we describe a diffractive backlight for a multi-view 3D display technology ideally suited for mobile applications. The backlight supports full-motion parallax in a wide view zone, and can be fabricated at low cost.
We demonstrate reflective color filters with high angular tolerance (± 65) in a metal-semiconductor-metal (MSM) resonator. The principle of operation and angular behavior of proposed filters are investigated and confirmed by numerical calculation and experiment.
We demonstrate an efficient guided-mode resonant color filter array. It consists of a thin subwavelength silicon nitride grating and a homogeneous silicon nitride waveguide on a glass substrate. The fabricated device exhibits high experimental efficiencies.
An all polymer EO modulator with a simple fabrication process using commercially available cladding materials has been designed, fabricated, and characterized. The result is a low Vπ modulator that is capable of being scaled up to larger scale production. Continued work on this project is being made towards designing an amplitude modulator structure and developing traveling wave transmission line...
We proposed a microring-based FBG-like filter using an ADM and a deeply etched Bragg grating. It helps select a wavelength for controlled reflection and sharp rejection. Filter bandwidth is determined by the resonator Q which is not affected by the reflector attachment. It can be readily applied to external cavity and microring lasers. Its structure is fully compatible with standard CMOS processes...
Optoelectronics with femtojoule or lower energies and compact custom and self-designing optics may enable the lower energy per operation and higher bandwidth density required for continued scaling of information processing. Novel approaches will be presented.
A Chip-level EAM/MQW-based optical interconnect concept with vertically-coupled efficient CW VCSELs and inter-chip links is analyzed, enabled by a lithographically-defined high-density multi-mode waveguide fabric. Projected energy/bit, bandwidth density, and packaging tolerances enable scaling with foreseeable CMOS technology.
We demonstrate the first monocrystalline germanium gate photoMOSFET integrated with silicon photonic waveguides and grating coupler. We measure a responsivity of 1.2 A/W at 1550nm with a 2×4 µm2 germanium gate.
An eigenmode expansion method is used to model and optimize optical couplers between SOI waveguides and Ge/SiGe devices. Electroabsorption modulator performances are estimated in term of extinction ratio and insertion losses.
A novel design of a PiN electro-optical modulator is proposed. A PN junction tunneling structure is inserted into the intrinsic region of the PiN EO modulator. Theoretical study shows a speed improvement of two times.
A new Mode Partition Noise model for VCSEL-based optical links capturing RIN and MPN via a covariance matrix is proposed and experimental parameter extraction is performed. The model removes Ogawa-Agrawal model assumptions inappropriate for VCSELs.
Comb switches are used to improve the bandwidth of wavelength-routed optical networks-on-chip (ONoC) without changing the network structure. A method is proposed to determine a minimal size comb MRR with given number of resonance wavelengths.
We present an ultra-compact optical diode using nonlinear second-order silicon microring resonator which is complementary metal-oxide semiconductor (CMOS) compatible. The designed optical diode features high isolation (>20 dB) and more tolerant resonance wavelength mismatch (+/−0.35 nm with <1.5 dB isolation degradation).
Strong field processes can be used to track complex dynamics in filamentary propagation of ultra-short femtosecond laser pulses. We review latest results on the generation of high-order harmonic radiation generated directly inside femtosecond filaments and elucidate propagation effects through observation of the resulting pulse duration. Few-cycle pulses and their temporal dynamics are measured using...
We demonstrate large, continuous redshift of high-order harmonics generated from carbon plasma. These harmoinics also have high intensity stability, with the harmonic yield only doubling when increasing the driving laser intensity by ten times.
We have observed the spatially-resolved optical amplification of femtosecond VUV pulses at 126 nm using an OFI Ar2* amplifier. The maximum amplification ratio of 2.57 was observed, which corresponded to the optical gain of 0.94 cm−1.
We present recent progress in development of a high power picosecond 100kHz regenerative amplifier based on Yb:YAG thin-disk technology. We employed both conventional 940nm pumping and zero-phonon-line pumping (969nm) to compare the output characteristics. The amplification output under the zero-phonon-line pumping was achieved more than twice of the output under the conventional pumping. We found...
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