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On-chip optical tweezers based on freeform optics Vrije Universiteit Brussel
Since its advent in the 1970s, optical tweezers have been widely deployed as a preferred non-contact technique for manipulating microscale objects. On-chip integrated optical tweezers, which afford significant size, weight, and cost benefits, have been implemented, relying upon near-field evanescent waves. As a result, these tweezers are only capable of manipulation in near-surface regions and often demand high power since the evanescent ...
Nonmagnetic Transformation Optics for Two-Dimensional Optical Devices Vrije Universiteit Brussel
In the past decade, some extraordinary devices, e.g., invisibility cloaks, perfect lenses and beam manipulators, have been realized thanks to a new design tool called transformation optics. This technique leads to unprecedented control of optical fields through complex material structures designed according to a predefined coordinate transformation. In order to achieve the intended flow of light without unwanted side-effects, ...
Ray optics in combination with the Gaussian beam propagation method for optical trapping of free-shaped particles in microfluidic systems Vrije Universiteit Brussel
We present a novel model for the prediction of particle trapping, in which different assets are combined to calculate optical forces and torques on free-shaped particles. This model suits well for designing an integrated dual fiber optical trap into a microfluidic chip. The force and torque estimation can easily be integrated in the scheme simulating the surrounding optofluidic chip. The propagation of the trapping laser light going through this ...
Organometallic Complexes for Non-Linear Optics. 51. Second- and Third-Order Non-Linear Optical Properties of Alkynylgold Complexes KU Leuven
The alkynes HC≡CC 6H 2-2,6-Et 2-4- C≡CC 6H 4-4-NO 2 (4) and HC≡CC 6H 4-4-C≡CC 6H 2-2,6-Et 2-4-C≡CC 6H 4-4-NO 2 (6) and gold alkynyl complexes Au{C≡CC 6H 2-2,5-(OEt) 2-4-C≡CC 6H 4-4-NO 2}(PPh 3) (7), Au(C≡CC 6H 2-2,6-Et 2-4-C≡CC 6H 4-4-NO 2)(PPh 3) (8), and Au(C≡CC 6H 4-4-C≡CC 6H 2-2,6-Et 2-4-C≡CC 6H 4-4-NO 2)(PPh 3) (9) have been synthesized. The linear optical properties and quadratic optical non-linearities of 79 have been measured, the latter ...
Organometallic Complexes for Nonlinear Optics. 43. Quadratic Optical Nonlinearities of Dipolar Alkynylruthenium Complexes with Phenyleneethynylene/Phenylenevinylene Bridges KU Leuven
The syntheses of trans-[Ru(4,4'-C = CC6H4C = CC6H4NO2)Cl(dppe)(2)] (19) and the systematically varied complexes trans-[Ru(4,4',4 ''-C = CC(6)H(4)X(2)C(6)H(4)y(2)C(6)H(4)NO(2))Cl(L-2)(2)] [L-2 = dppe, X-2 = C = C, Y-2 = (E)-CH=CH (12), C = C (18); L-2 = dppe, X-2 = (E)-CH=CH, Y-2 = C = C (14), (E)-CH=CH (16); L-2 = dppm, X-2 = C = C, Y-2 = (E)-CH=CH (13); L-2 = dppm, X-2 = (E)-CH=CH, Y-2 = C = C (15), (E)-CH=CH (17)] are reported, the latter ...
Organometallic complexes for nonlinear optics. 52. Syntheses, structural, spectroscopic, quadratic nonlinear optical, and theoretical studies of Ru(C2C6H4R-4)(kappa(2)-dPPf)(eta(5)-C5H5) (R = H, NO2) KU Leuven
The synthesis of Ru(CCC6H4-4-NO2) (κ2-dppf)(η5-C5H5) (1) is reported, together with spectroscopic, X-ray structural, linear optical and quadratic nonlinear optical (NLO) studies of 1 and Ru(CCPh)(κ2- dppf)(η5-C5H5) (2), the last-mentioned using the hyper-Rayleigh scattering technique at 1064 nm. Quadratic nonlinearities for these dppf-containing complexes are comparable to those of their dppe-containing analogues and significantly greater than ...
Reversible and tunable second-order nonlinear optical susceptibility in PZT thin films for integrated optics Universiteit Gent
Second-order nonlinear optical processes enable a wide range of applications used in research and industry. The majority of available second-order nonlinear devices however relies on bulk nonlinear crystals with low second-order nonlinearity. By exploiting the advancements made in integrated optics, materials with large second-order nonlinearity can enable efficient and small-sized on-chip nonlinear devices at low cost. Unfortunately, silicon ...