A two-dimensional optical deflector comprising: a first SOI structure consisting of a first monocrystalline silicon support layer, a first monocrystalline silicon active layer and a first intermediate silicon dioxide layer sandwiched by said first monocrystalline silicon support layer and said first monocrystalline silicon active layer; a second SOI structure consisting of a second monocrystalline silicon support layer, a second monocrystalline silicon active layer and a second intermediate silicon dioxide layer sandwiched by said second monocrystalline silicon support layer and said second monocrystalline silicon active layer, a height of said first monocrystalline silicon active layer being smaller than a height of said second monocrystalline silicon active layer; a mirror; an inner frame surrounding said mirror; an inner piezoelectric actuator (4a, 4b; 14a, 14b) coupled between said mirror and said inner frame and adapted to rock said mirror around a first axis; an outer frame surrounding said inner frame; and an outer piezoelectric actuator (6a, 6b) coupled between said inner frame and said outer frame and adapted to rock said mirror around a second axis, wherein said mirror includes said second monocrystalline silicon active layer without said first monocrystalline silicon active layer, wherein said inner frame, said inner piezoelectric actuator (4a, 4b; 14a, 14b) and said outer frame include said first monocrystalline silicon active layer and said second monocrystalline silicon active layer, and wherein said outer piezoelectric actuator (6a, 6b) includes said first monocrystalline silicon active layer without said second monocrystalline silicon active layer. a first SOI structure consisting of a first monocrystalline silicon support layer, a first monocrystalline silicon active layer and a first intermediate silicon dioxide layer sandwiched by said first monocrystalline silicon support layer and said first monocrystalline silicon active layer; a second SOI structure consisting of a second monocrystalline silicon support layer, a second monocrystalline silicon active layer and a second intermediate silicon dioxide layer sandwiched by said second monocrystalline silicon support layer and said second monocrystalline silicon active layer, a height of said first monocrystalline silicon active layer being smaller than a height of said second monocrystalline silicon active layer; a mirror; an inner frame surrounding said mirror; an inner piezoelectric actuator (4a, 4b; 14a, 14b) coupled between said mirror and said inner frame and adapted to rock said mirror around a first axis; an outer frame surrounding said inner frame; and an outer piezoelectric actuator (6a, 6b) coupled between said inner frame and said outer frame and adapted to rock said mirror around a second axis, wherein said mirror includes said second monocrystalline silicon active layer without said first monocrystalline silicon active layer, wherein said inner frame, said inner piezoelectric actuator (4a, 4b; 14a, 14b) and said outer frame include said first monocrystalline silicon active layer and said second monocrystalline silicon active layer, and wherein said outer piezoelectric actuator (6a, 6b) includes said first monocrystalline silicon active layer without said second monocrystalline silicon active layer.