A dielectric optical cloak has been experimentally demonstrated for the first time. The cloak is designed using quasi-conformal mapping to conceal an object placed under a curved reflecting surface that mimics a flat surface. The cloak is made of isotropic dielectric materials, enabling broadband and low-loss invisibility at wavelengths of 1400-1800 nm. Unlike previous cloaking methods that rely on metallic elements and resonant structures, this dielectric cloak uses non-resonant elements, such as conventional dielectric materials, to achieve low-loss and broadband cloaking. The cloak is fabricated on a silicon-on-insulator (SOI) wafer with a 250-nm-thick silicon layer and a 3-μm-thick silicon oxide slab. The cloak region is designed using a 2D sub-wavelength hole lattice with varying density, which creates a variable index profile. The cloak is placed around a curved reflecting surface (bump), and a light beam incident on the bump exhibits a reflection profile identical to that of a beam reflected from a flat surface. This allows any arbitrarily shaped object placed behind the bump to remain invisible. The cloak is shown to be isotropic, low-loss, and broadband, and it represents a major step towards general transformation optics. The experimental results demonstrate that the cloak can transform a curved surface into a flat surface, making the object invisible. The cloak's performance is verified through 2D and 3D simulations, and it is shown to work over a broad wavelength range of 1400-1800 nm. The cloak's design is also shown to be scalable and compatible with visible and infrared wavelengths. The results suggest that dielectric optical cloaks could be used for a wide range of applications, including invisibility devices and optical components.A dielectric optical cloak has been experimentally demonstrated for the first time. The cloak is designed using quasi-conformal mapping to conceal an object placed under a curved reflecting surface that mimics a flat surface. The cloak is made of isotropic dielectric materials, enabling broadband and low-loss invisibility at wavelengths of 1400-1800 nm. Unlike previous cloaking methods that rely on metallic elements and resonant structures, this dielectric cloak uses non-resonant elements, such as conventional dielectric materials, to achieve low-loss and broadband cloaking. The cloak is fabricated on a silicon-on-insulator (SOI) wafer with a 250-nm-thick silicon layer and a 3-μm-thick silicon oxide slab. The cloak region is designed using a 2D sub-wavelength hole lattice with varying density, which creates a variable index profile. The cloak is placed around a curved reflecting surface (bump), and a light beam incident on the bump exhibits a reflection profile identical to that of a beam reflected from a flat surface. This allows any arbitrarily shaped object placed behind the bump to remain invisible. The cloak is shown to be isotropic, low-loss, and broadband, and it represents a major step towards general transformation optics. The experimental results demonstrate that the cloak can transform a curved surface into a flat surface, making the object invisible. The cloak's performance is verified through 2D and 3D simulations, and it is shown to work over a broad wavelength range of 1400-1800 nm. The cloak's design is also shown to be scalable and compatible with visible and infrared wavelengths. The results suggest that dielectric optical cloaks could be used for a wide range of applications, including invisibility devices and optical components.