Interference filters with high transmission and large rejection range for mini-spectrometer

A minispectrometer for receiving an incident light and detecting one or more of light components of the incident light, comprising:

• a first interference filter configured for receiving the incident light and selecting a first light component of the incident light to be transmitted;
• and
• a first photodetector configured for detecting the first light component transmitted by the first interference filter;
• wherein the first interference filter comprises a first metal mirror, a first dielectric mirror, and a first spacer placed between the first metal mirror and the first dielectric mirror, and wherein the first metal mirror and the first dielectric mirror are configured to enable optical interference in the first spacer to select the first light component of the incident light to be transmitted.

A method for fabricating at least a first interference filter for receiving an incident light and selecting a first light component of the incident light to be transmitted, the method comprising the steps of:

• providing a first metal mirror;
• providing a spacer over the first metal mirror;
• and
• providing a dielectric mirror over the spacer,
• wherein the first metal mirror, a part of the spacer provided substantially over the first metal mirror, and a part of the dielectric mirror provided substantially over the part of the spacer provided substantially over the first metal mirror form a first interference filter for receiving the incident light and selecting the first light component of the incident light to be transmitted.