Photoacoustic device including a light guide system configured to transmit light through an electromagnetic interference (EMI)-reducing layer

An apparatus, comprising:

• a platen;
• an electromagnetic interference (EMI)-reducing system including a first EMI-reducing layer;
• a light source system configured to emit light through an opening in the first EMI-reducing layer to a first platen area, the light source system including a light-emitting component, light source system circuitry and a light guide system, the light guide system being configured to transmit light from the light-emitting component to the first platen area, the light guide system including a light pipe residing between the first EMI-reducing layer and the platen, the light guide system further including a first light-directing element for directing light from the opening in the first EMI-reducing layer to the light pipe;
• and
• a receiver system including an array of receiver elements and receiver system circuitry, the receiver system being configured to detect acoustic waves corresponding to a photoacoustic response of a target object in contact with the first platen area to light emitted by the light source system, wherein the first EMI-reducing layer reduces a level of EMI emitted by the light source system circuitry that is received by the receiver system circuitry, wherein the first EMI-reducing layer includes a conductive material having a resistivity of less than 3×10−8 ohm-meters, a material having a magnetic permeability of at least 5×10−3 henries per meter, or a combination thereof.