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1.
Opt Express ; 29(5): 6582-6598, 2021 Mar 01.
Article in English | MEDLINE | ID: mdl-33726176

ABSTRACT

A combination of advanced light engineering concepts enables a substantial improvement in photon extraction efficiency of micro-cavity-based single-photon sources in the telecom O-band at ∼1.3 µm. We employ a broadband bottom distributed Bragg reflector (DBR) and a top DBR formed in a dielectric micropillar with an additional circular Bragg grating in the lateral plane. This device design includes a doped layer in pin-configuration to allow for electric carrier injection. It provides broadband (∼8-10 nm) emission enhancement with an overall photon-extraction efficiency of ∼83% into the upper hemisphere and photon-extraction efficiency of ∼79% within numerical aperture NA=0.7. The efficiency of photon coupling to a single-mode fiber reaches 11% for SMF28 fiber (with NA=0.12), exceeds 22% for 980HP fiber (with NA=0.2) and reaches ∼40% for HNA fiber (with NA=0.42) as demonstrated by 3D finite-difference time-domain modeling.

2.
Radiats Biol Radioecol ; 55(5): 539-47, 2015.
Article in Russian | MEDLINE | ID: mdl-26863784

ABSTRACT

The results of long-term (2007-2011) observations on the quality of seed progeny in Scots pine populations inhabiting the sites within the Bryansk region contaminated as a result of the Chernobyl NPP accident are presented. Formed under the chronic exposure seeds are characterized by a high interannual variability, which is largely determined by weather conditions.


Subject(s)
Chernobyl Nuclear Accident , Pinus sylvestris/radiation effects , Radioactive Pollutants , Seeds/radiation effects , Humans , Pinus sylvestris/growth & development , Radiation Monitoring , Seeds/growth & development
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