A tetragonal barium titanate (BTO) thin film of high crystal quality with a c-axis oriented out of the plane was successfully grown at 500℃ on the strontium titanate(100) substrate using the physical vapor deposition technique. It showed epitaxial growth with a dense morphology and a low full width at half maximum value (FWHM) of 0.5° in the X-ray diffraction spectroscopy rocking curve measurements of the BTO(002) reflection. Using a modified Sénarmont method, the birefringence measurement of the BTO film revealed that it predominantly exhibits a quadratic and asymmetric electrooptic (EO) behavior in response to the applied DC electric field with an effective EO coefficient value of 1.94 × 10-19 m2/V2, providing useful insights on the BTO growth and its potential optoelectronics applications.
Flat optics with micro-nano-structures fabricated on a thin film has shown strong power in light manipulation and is promising for integrated optoelectronics for its compactness and compatibility for large volume manufacturing. In this talk, I will introduce flat lenses to break the diffraction limit and their applications in medical imaging and high density data storage. By engaging the strong excitonic absorption in 2D materials, ultra-thin flat lenses in MoS2 is demonstrated for sub-diffraction limit imaging. Furthermore, high electrical tunability in refractive index is achieved in monolayer WS2 in an optical cavity for potentially tunable ultra-thin flat lenses.
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