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Home Moldova Technologies Photodiode with Selective Bidimensional Sensitivity

Photodiode with Selective Bidimensional Sensitivity

Description

The photodiode with selective bidimensional sensitivity (quadrant-photodiode) elaborated on the basis of InP-In- GaAsP heterostructures with InGaAsP thick wide-gap frontal layer assures selective sensitivity to λ=1.06 mm for atmosphere telecommunications systems usage. The photodiode structure is divided into 6 elements: four elements having circular sector form used for determination of the incident light signal position; a circumferential guard ring, which signalizes the incident signal emission moment; an integrated central detector with small area allows to detect high-frequency optic signals.

Innovative Aspect and Main Advantages

The simultaneous combination of selective, coordinate and high-frequency sensitivity in a single device:

  • Selective photosensitivity (λΔ ≤ 70 nm);
  • Determination of X and Y coordinates of received optic signals by linear characteristic, the slope of the coordinate characteristic – 6*103 V/W*mm;
  • Detection of unitary optic signals with an impulse duration less than 10 ns and of more than 1 GHz.

Areas of Application

Instrument engineering, Electronics, Military. Control and direction of moving objects.

Topology of quadrant-photodiode
Fig. 1 Topology of quadrant-photodiode.
1 - four sectors for determination position of light signal;
2 - circumferential guard ring;
3- central detector.

The coordinate characteristics for various radius of central detector.
Fig. 2 The coordinate characteristics for various radius of central detector.

Stage of Development

The quadrant-photodiode was tested at:

  • National Research and Development Institute for Laser, Plasma and Radiation, Bucharest, Romania;
  • Regie Autonome «Industrial Army Group», Romania

Covered by the patent of R. Moldova MD 887 G2

Contact Details

Technical University of Moldova
Valerian DOROGAN, vice-rector, Sergiu ZAPOROJAN, department of scientific investigations
Address: 168, Stefan cel Mare St. Chisinau, MD-2004, Republic of Moldova
Tel/Fax: (+373 22) 235 437; 235 405
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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