Textured silicon calorimetric light detector

We apply the standard photovoltaic technique of texturing to reduce the reflectivity of silicon cryogenic calorimetric light detectors. In the case of photons with random incidence angles, absorption is compatible with the increase in surface area. For the geometrically thin detectors studied, energy resolution from athermal phonons, dominated by position dependence, is proportional to the surface-to-volume ratio. With the CaWO4 scintillating crystal used as light source, the time constants of the calorimeter should be adapted to the relatively slow light-emission times.

[1]  L. Stodolsky,et al.  Quasiparticle diffusion over several mm in cryogenic detectors , 2001 .

[2]  James Jungho Pak,et al.  Experiments on anisotropic etching of Si in TMAH , 2001 .

[3]  L. Stodolsky,et al.  Active thermal feedback for massive cryogenic detectors , 2000 .

[4]  C. A. Stover,et al.  Giant birefringent optics in multilayer polymer mirrors , 2000, Science.

[5]  L. Stodolsky,et al.  Discrimination between nuclear recoils and electron recoils by simultaneous detection of phonons and scintillation light , 1999, physics/9906017.

[6]  D. Camin,et al.  A scintillating bolometer for experiments on double beta decay , 1998 .

[7]  S. Marnieros,et al.  Status of the EDELWEISS experiment , 1998, astro-ph/9801199.

[8]  N. Coron,et al.  Alpha/gamma discrimination with a CaF2(Eu) target bolometer optically coupled to a composite infrared bolometer , 1997 .

[9]  A. Nucciotti,et al.  Model for cryogenic particle detectors with superconducting phase transition thermometers , 1995 .

[10]  Michael M. Frank,et al.  Low-energy X-ray detection in cryogenic detectors with tungsten thermometers , 1995 .

[11]  B. Neganov,et al.  Application of ionization to heat conversion to the light absorption spectra measurement in silicon at 1 K through adiabatic calorimetry , 1993 .

[12]  Betty A. Young,et al.  Measurement of ionization and phonon production by nuclear recoils in a 60 g crystal of germanium at 25 mK. , 1992, Physical review letters.

[13]  J. D. Lewin,et al.  Demonstration of nuclear recoil discrimination for low temperature dark matter detectors, by measurement of simultaneous ionization and thermal pulses in silicon , 1991 .

[14]  J. Beeman,et al.  Calorimetric Ionization Detector , 1989 .

[15]  R. Powell,et al.  Luminescence of calcium tungstate crystals , 1974 .