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iPCA - interdigital array)

iPCA - interdigital array

iPCA - interdigital array

 iPCA - interdigital array -large area broadband emitter or detector antenna for high power optical excitation

Part No.

Delivery time

l 
(µm)

g 
(µm)

w 
(µm)

Description

iPCA-21-05-300-800-h

1 week

21

05

300

interdigital photoconductive terahertz antenna, resonance frequency 2 THz, gap distance 5 µm, active area 300 µm x 300 µm, optical excitation wavelength λ= 800 nm, with adjusted hyperhemispherical silicon lens, BNC connector

iPCA-21-05-1000-800-h

1 week

21

05

1000

interdigital photoconductive terahertz antenna, resonance frequency 2 THz, gap distance 5 µm, active area 1 mm x 1 mm, optical excitation wavelength λ= 800 nm, with adjusted hyperhemispherical silicon lens, BNC connector

iPCA working principle

An extended gap along the finger electrodes of the iPCA is illuminated by a short pulse laser beam. By using the microlens array only every second gap between the finger structure is excited by the laser. The fill factor of the lens array of 73.5 % ensures, that nearly the total optical laser energy is used for excitation of carriers. Despite of the large emitting area the needed voltage for the carrier excitation is low (< 35 V) because of the small gap of only 5 µm. The coherent excitation of the single emitters located at every microlens spot results in a constructive interference of the radiated THz waves in the far field. 

Mounting:

iPCA chip, size 4 mm x 4 mm, thickness 625µm, mounted on 25.4 mm diameter black aluminium mount with prealigned hyperhemispherical silicon lens ∅ 12 mm and prealigned fused silica lens array, size 2 mm x 2 mm, and 1 m coaxial cable (RG 178) with BNC or SMA connector. 

Part No. example

Description

 iPCA-21-05-1000-800-h

interdigital PhotoConductive Antenna

 iPCA-21-05-1000-800-h

length l = 21 µm

 iPCA-21-05-1000-800-h

gap distance g = 5 µm

 iPCA-21-05-1000-800-h

width w = 1000 µm

 iPCA-21-05-1000-800-h

laser excitation wavelength λ ~ 800 nm

 iPCA-21-05-300-800-h

mounted on a hyperhemispherical Si lens with 12 mm diameter

 iPCA-21-05-1000-800-h

mounted on a hyperhemispherical Si lens with 12 mm diameter

 

additional options:

 iPCA-21-05-1000-800-c

mounted on an collimating aspheric Si substrate lens with 12 mm diameter
download THz beam guiding information

 iPCA-21-05-1000-800-a

mounted on an aspheric focusing Si lens with 12 mm diameter
download THz beam guiding information

 iPCA-21-05-1000-800-h-f

fiber coupled antenna with FC/PC connector

 


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