Multichannel close-up imaging device

A device for optically imaging at least a part of an object, comprising a two-dimensional array of optical channels, the array having a main plane,

• each optical channel having an optical axis and being arranged such that the optical axis is perpendicular to the main plane,
• each optical channel comprising:
• a first lens system comprising a first lens, and
• a second lens system comprising a second lens,
• each of the first and second lens having an optical axis aligned with the optical axis of the optical channel,
• the first lens system and the second lens system being arranged such that a first surface of the first lens is a light entrance surface of the optical channel, and a second surface of the second lens is a light exit surface of the optical channel, such that light propagates from the light entrance surface to the light exit surface within the optical channel,
• wherein each optical channel has an optical low-pass angular filter configured to block any light propagating through the optical channel along a direction of propagation having an angle which is greater than a predefined angle θL relative to the optical axis, the low-pass angular filter comprising at least one planar interface, separating a first material having a first refractive index n1 and a second material having a second refractive index n2, arranged such that light propagating from the light entrance surface to the light exit surface successively propagates through the first material and the second material, a ratio of the second refractive index over the first refractive index being lower than 1,
• each optical channel comprising a field lens system, the field lens system comprising at least a field lens arranged between the first lens system and the second lens system along the optical axis of the optical channel,
• the planar interface being configured to block light propagating through the optical channel in a direction of propagation having an angle which is greater than or equal to a critical angle θC relative to the optical axis, by total internal reflection, the critical angle θC being greater than or equal to the predefined angle θL,
• wherein the critical angle θc, a distance zn between the first lens and a nodal plan of the field lens system along the optical axis, and a distance x1l in the main plane between the center of a first lens and a border of an adjacent optical channel are such that:
• zn=x1l/tan(θc), and
• a distance between the main plane and the first planar interface being lower than zn.