The invention relates to a device (100) having the following features: a microstructure (10) which has a MEMS structure or a MOEMS structure, a carrier (20) on which the microstructure (10) is arranged, a housing (30 ), which consists of a material that is transparent to at least one predetermined wavelength of light and hermetically encapsulates a cavity (40) which directly surrounds the microstructure (10) on the carrier (20). The device (10) can be designed as a light emitter unit (200) and / or light detector unit (300), it being possible for the units to be individually or jointly part of a photoacoustic gas sensor (400).
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