Optical Sample Detection System

An optical sample detection system comprising:

• a sensor chip including:
• a dielectric member;
• a metal film adjacent to an upper surface of the dielectric member;
• a reaction layer adjacent to an upper surface of the metal film;
• and
• a lid member disposed on an upper surface of the reaction layer;
• a chip loader including a chip holder for holding the sensor chip;
• and
• a light projecting unit that irradiates the metal film with excitation light through the dielectric member, the optical sample detection system detecting a sample by irradiating the metal film with the excitation light through the dielectric member, wherein
• the lid member has a larger width than the width of the dielectric member in an optical path cross section of the excitation light, and
• emission surface reflected light emitted to an outside of the dielectric member after the excitation light is reflected by an emission surface of the dielectric member is not incident on the lid member within a measurement scanning angle of the excitation light.