Magnetic field sensor and optical collector

A sensor array system, comprising:

• an array of sensor units, each of the array of sensor comprising:
• at least one crystal structure comprising an ensemble of color centers;
• at least one optical detector;
• and
• an optical collector positioned between said at least one crystal structure and said at least one optical detector for directing optical emission from said at least one crystal structure to said at least one optical detector;
• wherein said at least one crystal structure has geometrical shape of a trapezoid prism having one of a first and second parallel facets directed toward the optical collector;
• and
• wherein said optical collector is formed as a planar waveguide having first trapezoid section interfacing said at least one crystal and a second rectangular section for transmitting collected light toward the at least one optical detector.

An optical collector, comprising:

• a waveguide unit having a first length dimension, a second width dimension and a third height dimension,
• wherein said first length dimension is longer than said second width dimension, and said second width dimension is wider than said third height dimension, and
• wherein said waveguide unit having a trapezoid prism form at one end thereof defining a first facet having an aera smaller than area formed by said second width dimension and said third height dimensions, and
• wherein said first facet being configured as input facet of the waveguide unit.