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Highly efficient single-photon collection from solid-state single-photon emitters is an important task in quantum optics. Here, we will introduce two approaches based on three-dimensional laser-written microstructures to enhance collection efficiency as well as directivity.
We report on optical non-paraxial beams that exhibit a self-accelerating behavior in radial direction. Hence, the intensity profile evolves on a spiraling trajectory. The beam parameters have been optimized for high contrast and rotation rate.
We propose a planar retroreflector composed of two cascaded high contrast periodic structures with slowly varying features. One of the high contrast structures focuses the light while the other reflects it as a concave mirror.
We demonstrate a new two-photon scanned light-sheet microscopy with diffraction-limited thickness and tailorable illumination area from 50×50 µm2 to 500×500 µm2, capable of multi-scale live imaging in one setup.
We present a proof of concept demonstration of THz free-space communication employing orbital angular momentum (OAM) multiplexing. Two different OAM modes are multiplexed and de-multiplexed in experiment via 3D printed spiral phase plates.
More than 2 Watts of continuous-wave external power at 3400 nm was obtained by difference frequency mixing of 1064.6 nm and 1549.8 nm fiber lasers in a periodically poled lithium niobate crystal at 50 °C.
By engineering parallelogram antenna on ZnSe substrate, we can control the wavefront of laser beam and design a flat lens at 10µm. The fabricated flat lens has demonstrated focusing effect matching well with simulation.
Laser-induced filaments can ablate solid material at distances greater than that practicably achieved through linear optics. We observed multi-scale structures on metals, polymers, and ceramics from filaments and compared to those from short-focused laser pulses.
Nano-patterning with linewidth of ∼55 nm is demonstrated utilizing two-surface-plasmon-polariton-absorption (TSPPA) at the wavelength of 400 nm. The SPP field generated by plasmonic mircolens is recorded by the TSPPA showing a new way for recording the SPP field in micro/nano structures.
A 500 µm Cr:ZnSe thin disk gain element was pumped at five different pump diameters. Laser output versus pump power was measured. Slope efficiency, threshold, and maximum power versus pump spot size were then extracted.
Dielectric metamaterial layers are lossless, and exhibit relatively high transmission efficiencies (contrary to plasmonic metasurfaces). Subwavelength dielectric lenses have been developed - demonstrating beam area contraction ratio of three, and insertion losses of 11%.
We show enhanced directional emission from nanocrystal quantum dots positioned at the center of a circular plasmonic lens. A collimation with a divergence of only ∼ 4° FWHM is achieved, a spectrally broad bandwidth.
Utilizing laser-induced surface bubbles on a metal film, we demonstrate a reconfigurable plasmonic lens in a microfluidic environment to achieve divergence, collimation, and focusing of surface plasmons.
We combined voltage-sensitive dye imaging (VSDi) with gradient-index (GRIN) rod lens to study neural functions in mice vibrissae system. Neural activities evoked in the thalamic barreloids by single whisker stimulation were visualized in vivo.
We report a systematic study of thermal effects in high-power single-pass SHG in the presence of absorption, and propose an optimum heating configuration for the crystal to minimize thermal lensing at various fundamental power levels.
Idler beam quality at 6.3 µm from HgGa2S4 OPO is compared for linear, planar ring and RISTRA cavities. The last one produces smooth, circular profile and much higher focal fluence.
In this paper a terahertz beam monitoring application of an optically pumped molecular terahertz laser with a 1 k-pixel CMOS terahertz camera is presented. The terahertz camera has been used to detect variations in real-time of the terahertz source beam around 2.52 THz.
The phase of optical beams can be modified by high contrast sub-wavelength periodic structures with gradually varying geometrical features. We present design, simulation, fabrication and characterization of planar micro-lenses shaping the beam of optical fibers.
We obtain sub-diffraction limited imaging at ω>ωp using a flat silver slab. Unlike Superlenses, the formation of subdiffraction imaging is attributed to high-k longitudinal modes that are supported by the non-local response of the media.
Self-compression of 2.2-mJ, 80-fs mid-IR pulses is achieved using a 1.5-mm-thick CaF2 plate. Femtosecond pulses with peak powers orders of magnitude higher than the self-focusing threshold can undergo self-compression without breaking up into multiple filaments.
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