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Detectability by photoacoustic spectroscopy of x-ray-induced ethylene emission in mice breath

We demonstrate fabrication of 2D photonic crystal structure inside the volume of SU-8 resist by four beams interference. This structure, actually, is a 3D structure fabricated inside the film without sample scanning laser beam steering. The mechanism of recording in transparent dielectrics is discussed in terms of third harmonic generation, white light continuum, and thermal emission by "hot" electrons.