▎ 摘　　要

NOVELTY - Optical element comprises a cover (101) having a first surface (102) and a second surface (103), a support (104), and a component adapted and arranged to move the second surface from a first cover contour profile to a further cover contour profile. The cover is orientated with the first surface directed towards the support. The spatial arrangement of the second surface relative to the support defines a cover contour profile. The cover comprises a 2-dimensional portion which is one or more 2-dimensional materials. The cover has a value of transmittance divided by reflectance of not more than 0.5, for light incident the second surface, the reflectance and transmittance are measured at a wavelength gamma which is in the range from 10 nm to 20 mu m. USE - Optical element used in device (claimed) such as adjustable optical mirror, an adjustable optical reflection and/or transmission diffuser, an adjustable optical reflection and/or transmission diffraction grating, an adjustable optical reflection and/or transmission filter, an adjustable optical reflection and/or transmission modulator, an adjustable optical reflection and/or transmission collector, etc. ADVANTAGE - The optical element enables to improve operational frequency, reduce mass, improve mechanical strength, reduce power consumption, improve reflectance, improve thrust, increase thermal conductance, increase thermal stability, increase dynamic range, reduce manufacturing complexity, increase effect homogeneity, helps in wavelength control and large continuous tuneability; and angle control and large continuous tuneability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a process for the preparation of an optical element, which involves providing a support, attaching a cover to the support, where the cover comprises a 2-dimensional material, and providing a component for altering the position of the cover in relation to the support. DESCRIPTION OF DRAWING(S) - The drawing shows a cross sectional view of an optical element. Cover (101) First surface (102) Second surface (103) Support (104) Contact points (105)