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We observe an effective magnetic field for photons using an on-chip silicon-based Ramsey-type interferometer. This interferometer generates a direction-dependent phase which corresponds to a magnetic field of 0.2 Gauss in an Aharonov-Bohm configuration for electrons.
We demonstrate a new method to extract the electronic carrier-induced loss and coupling coefficients of modern thermo-optic and electro-optic silicon Mach-Zehnder interferometer based 2x2 switches (Sandia, IBM and Kotura-Oracle) from the transmission spectra.
The state-of-the art for control of microring based devices is tuningjust resonant phase. We introduce an extremum-seeking discrete-multitone adaptive controller, concurrently tuning both resonant phase and second coupling phase parameter optimizing microring critical coupling. OCIS codes: (230.5750) Resonators; (230.4110) Modulators; (130.3120) Integrated optics devices; Extremum-seek control
With Additive Manufacturing AM, parts can be manufactured for design instead of being designed for manufacture. This tutorial introduces the two laser based AM processes, Selective Laser Melting SLM and Laser Material Deposition LMD.
A high-efficiency continuous-wave laser-diode-pumped Yb:YAG laser has been realized at room temperature by high intensity pumping. The slope efficiency and optical-to-optical conversion efficiency were 77 % and 72 % for the absorbed pump power, respectively.
We report on the large Kerr induced wavelength shift observed in our hydrogenated amorphous silicon microresonators and demonstrate their use for all-optical modulation and switching on picosecond time scales with only subpicojoule pulse energies.
The scintillation yield of rare-earth doped LaF3 nanoparticles (NPs) was experimentally measured. Taken together with evidence of FRET between NPs and covalently bound photosensitizer molecules, this suggests a route to combine radiation and photodynamic therapy.
We report an efficient, high-energy, diode-pumped Yb:CaF2 regenerative amplifier. Energies up to 1.02 mJ at 1045-nm and 5 kHz-repetition rate in 324 fs-long pulses have been obtained with a beam quality factor of M2 =1.1.
We present a fully integrated mid-infrared sensor. The laser and detector are fabricated from a bi-functional quantum cascade structure, connected through a dielectric-loaded surface plasmon waveguide, which acts as interaction zone and provides high coupling.
We demonstrate optofluidic microlasers based on liquid microdroplets stabilized by a superhydrophobic surface. Lasing is achieved using highly efficient non-radiative Förster resonance energy transfer between donor and acceptor molecules placed within the droplets.
Open-access microcavities are an original approach for lab-on-a-chip optofluidic sensing since they offer a direct access to the confined electromagnetic field. This work describes their basic characteristics for refractive index and nanoparticle sensing.
Repeatability of resonance detection for on-chip microring resonators is systematically studied. An efficient interferometric method is presented to improve the accuracy by more than one order of magnitude in an 8 nm bandwidth, without any temperature control.
We experimentally demonstrate avalanche sub bandgap detection of light at 1550 nm wavelength via surface states using the configuration of interleaved PN junctions along a silicon waveguide. The device operates in a fully depleted mode.
We demonstrated antenna-assisted mid-infrared graphene detectors at room temperature with more than 200 times enhancement of responsivity (0.4 V/W at λ0=4.45 µm) compared to devices without antennas (<2 mV/W).
Broadly tunable single-mode quantum cascade laser at ∼10 µm with a monolithically integrated two-section slot structure is presented. The device shows ∼80 cm−1 tuning range and ∼20 dB side mode suppression ratio by adjusting the currents and temperature.
Using an optofluidic chip with an integrated nanopore, a mixture of nanobeads and influenza viruses were opto-electrically detected. Different types of nanoparticles can be distinguished by different fluorescence wavelengths and fluorescence correlation functions.
By combining first and second order DFB gratings, a new solution for surface emission QCL is presented. A QWS mode and a buried hetero-structure process allow single mode emission and low dissipation devices.
The non-uniform electric field in the active regions of an interband cascade laser is directly imaged and characterized for the first time by employing a nanoscopic voltage profiling technique.
We demonstrate a new time-of-flight stabilization technique based on all-fiber-loop optical-microwave phase detectors. The demonstrated relative frequency instability between 2.856-GHz signals separated by a 2.3-km fiber link is 6.5×10−19 at 82500-s averaging time.
We present a novel feed-forward laser linewidth reduction scheme. The linewidth of a DFB laser is reduced from 9.4MHz to 37.2kHz. Sixteen modes of a mode-locked laser are simultaneously reduced from ∼20MHz to below 300kHz.
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