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1.
Phys Rev Lett ; 125(17): 173901, 2020 Oct 23.
Article in English | MEDLINE | ID: mdl-33156678

ABSTRACT

We observe high optical quality factor (Q) polygonal and star coherent optical modes in a lithium niobate microdisk. In contrast to the previous polygon modes achieved by deformed microcavities at lower mechanical and optical Q, we adopt weak perturbation from a tapered fiber for the polygon mode formation. The resulting high intracavity optical power of the polygon modes triggers second harmonic generation at high efficiency. With the combined advantages of a high mechanical Q cavity, we observe optomechanical oscillation in polygon modes for the first time. Finally, we observe frequency microcomb generation from the polygon modes with an ultrastable taper-on-disk coupling mechanism.

2.
Opt Lett ; 40(22): 5383-6, 2015 Nov 15.
Article in English | MEDLINE | ID: mdl-26565880

ABSTRACT

We propose an unprecedented transmit-array configuration which can mold the incident beam by modulating phase and amplitude wavefronts. The transmit-array is composed of patterned graphene metasurfaces as shunt admittance sheets. Thanks to the exceptional features of graphene such as tunability, thinness, low loss, and high confinement of graphene plasmons, the proposed subwavelength structure passes strict touchstones for nano-photonic and opto-electronic applications. Two flat-optics functionalities, i.e., focusing and splitting, are realized by means of the proposed configuration.

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