Paper ID: WE1C03

THz antenna-coupled Zero-Bias Schottky Diode
Detectors for Particle Accelerators
Rahul Yadav 1,2, J. Michael Klopf 3, Michael Kuntzsch 3,
Sascha Preu 1, Andreas Penirschke 2
1Terahertz Devices and Systems, TU Darmstadt
2High Frequency Technology, THM Friedberg

3Institute of Radiation Physics, HZDR Dresden

Date: 13th September 2023
Rahul Yadav | rahul.yadav@iem.thm.de

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Paper ID: WE1C03

Content

 Motivation- What are THz waves?
- Development of THz components- Requirement of THz detectors
 Zero-Bias Schottky Diode (ZBSD) based detectors- ZBSD & it’s operational principle- Antenna analysis- Detector fabrication- In-house characterization- With free electron laser, HZDR (FELBE) characterization
 Summary Outlook
Rahul Yadav | rahul.yadav@iem.thm.de

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Motivation : what are THz waves ?

Paper ID: WE1C03

THz Gap

1 THz
1 ps
33 1/cm
0.3 mm
4.1 meV

Source : Advantest corporation
Rahul Yadav | rahul.yadav@iem.thm.de

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3

Motivation : development of THz components

Rahul Yadav | rahul.yadav@iem.thm.de

Paper ID: WE1C03

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4

Motivation : development of THz components

Paper ID: WE1C03

THz detectors

THz sourcesTHztechnology

THz components

THz post-detection
electronics

Rahul Yadav | rahul.yadav@iem.thm.de

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4

Motivation : development of THz components

Paper ID: WE1C03

Table top system

THz detectors

THz sources

𝜆𝜆1

AC Bias
Laser 1

THz-TxTHz
technology

THz components

THz post-detection
electronics

Laser 2𝜆𝜆2

SampleTHz-Rx

Laser
Beat

Lock-indetection
Source : Toptica Photonics AG

THz Power:
100 GHz ~ 100 µW
1 THz ~ 1 µW

Rahul Yadav | rahul.yadav@iem.thm.de

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Motivation : development of THz components
Table top system

THz detectors

THz sources

𝜆𝜆1

THz post-detection
electronics

Laser 1

Laser 2𝜆𝜆2Free electron laser,
HZDR, Dresden

AC BiasTHz-TxTHz
technology

THz components

Paper ID: WE1C03

SampleTHz-Rx

Laser
Beat

Lock-indetection
Source : Toptica Photonics AG

THz Power:
100 GHz ~ 100 µW
1 THz ~ 1 µW

Rahul Yadav | rahul.yadav@iem.thm.de

Pulse energy: up to 2 µJ
THz Power ~ 1 to 100 W(depending on wavelengthand beam parameters)
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4

Motivation : development of THz components
Table top system

THz detectors

THz sources

𝜆𝜆1

THz post-detection
electronics

Laser 1

Laser 2𝜆𝜆2Free electron laser,
HZDR, Dresden

AC BiasTHz-TxTHz
technology

THz components

Paper ID: WE1C03

SampleTHz-Rx

Laser
Beat

Lock-indetection
Source : Toptica Photonics AG

THz Power:
100 GHz ~ 100 µW
1 THz ~ 1 µW

Rahul Yadav | rahul.yadav@iem.thm.de

Pulse energy: up to 2 µJ
THz Power ~ 1 to 100 W(depending on wavelengthand beam parameters)
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Motivation : requirement of direct THz detectors
High power
detectors

ThermalPaper ID: WE1C03

Suitable for ms scalepulses
Source: SLT Sensor- und Lasertechnik GmbH

Rahul Yadav | rahul.yadav@iem.thm.de

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Motivation : requirement of direct THz detectors
High power
detectors

ThermalPaper ID: WE1C03

Suitable for ms scalepulses
Source: SLT Sensor- und Lasertechnik GmbH

Fast high power
detectors

Photon dragSuitable for lesssensitive applications
Source: Hamamatsu photonics

Rahul Yadav | rahul.yadav@iem.thm.de

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5

Motivation : requirement of direct THz detectors
High power
detectors

ThermalPaper ID: WE1C03

Suitable for ms scalepulses
Source: SLT Sensor- und Lasertechnik GmbH

Fast high power
detectors

Fast &
sensitive
detectors

Photon dragRectifying
Schottky diodes
THz detector

Suitable for lesssensitive applications
Source: Hamamatsu photonics

Suitable for lower
THz power

Rahul Yadav | rahul.yadav@iem.thm.de

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5

Motivation : requirement of direct THz detectors
High power
detectors

ThermalPaper ID: WE1C03

Suitable for ms scalepulses
Source: SLT Sensor- und Lasertechnik GmbH

Fast high power
detectors

Fast &
sensitive
detectors

Photon dragRectifying
Schottky diodes
THz detector
Rectifying FET
THz detector

Suitable for lesssensitive applications
Source: Hamamatsu photonics

Suitable for lower
THz power
Suitable for higher
THz power
Rahul Yadav | rahul.yadav@iem.thm.de

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5

Motivation : requirement of direct THz detectors
High power
detectors

ThermalSuitable for ms scalepulsesPaper ID: WE1C03

Experimental setup at FELBE, HZDR

Source: SLT Sensor- und Lasertechnik GmbH

Fast high power
detectors

Fast &
sensitive
detectors

Photon dragRectifying
Schottky diodes
THz detector
Rectifying FET
THz detector

Suitable for lesssensitive applications
Source: Hamamatsu photonics

Suitable for lower
THz power

FET THz
Detector

Suitable for higher
THz power
Rahul Yadav | rahul.yadav@iem.thm.de

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5

Motivation : requirement of direct THz detectors
High power
detectors

ThermalSuitable for ms scalepulsesPaper ID: WE1C03

Experimental setup at FELBE, HZDR

Source: SLT Sensor- und Lasertechnik GmbH

Fast high power
detectors

Fast &
sensitive
detectors

Photon dragRectifying
Schottky diodes
THz detector
Rectifying FET
THz detector

Suitable for lesssensitive applications
Source: Hamamatsu photonics

Suitable for lower
THz power

FET THz
Detector

Suitable for higher
THz power
Rahul Yadav | rahul.yadav@iem.thm.de

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5

Paper ID: WE1C03

ZBSD based detectors : ZBSD & it’s operational principal
 Fast and sensitive room temperature
operable THz detectors

 Semiconductor material:ID
UD GaAs and Silicon: small signal

detection with bias voltage, biasing
increases noise component.
Band energy: 𝜑𝜑GaAs = 0.34 eV,
𝜑𝜑Si = 1.1 eV InGaAs: zero-bias operation, low
noise contribution
Band energy: 𝜑𝜑InGaAs = 0.75 eV

Rahul Yadav | rahul.yadav@iem.thm.de

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Paper ID: WE1C03

ZBSD based detectors : ZBSD & it’s operational principal
 Fast and sensitive room temperature
operable THz detectors

 Semiconductor material:IDUD

quadratic
region GaAs and Silicon: small signal

detection with bias voltage, biasing
increases noise component.
Band energy: 𝜑𝜑GaAs = 0.34 eV,
𝜑𝜑Si = 1.1 eV InGaAs: zero-bias operation, low
noise contribution
Band energy: 𝜑𝜑InGaAs = 0.75 eV

linearregionquadratic region
2∝ 𝑃𝑃in
𝑈𝑈out ∝ 𝑈𝑈in

linear region

Rahul Yadav | rahul.yadav@iem.thm.de

𝑈𝑈out ∝ 𝑈𝑈in ∝
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𝑃𝑃in

6

Paper ID: WE1C03

ZBSD based detectors : ZBSD & it’s operational principalRahul Yadav | rahul.yadav@iem.thm.de

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Paper ID: WE1C03

ZBSD based detectors : ZBSD & it’s operational principalIncident THz signal

Rahul Yadav | rahul.yadav@iem.thm.de

𝑈𝑈0 𝑡𝑡 = 𝑈𝑈0 cos(𝜔𝜔𝜔𝜔)
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Paper ID: WE1C03

ZBSD based detectors : ZBSD & it’s operational principalIncident THz signal

Si - lens

Rahul Yadav | rahul.yadav@iem.thm.de

𝑈𝑈0 𝑡𝑡 = 𝑈𝑈0 cos(𝜔𝜔𝜔𝜔)
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Paper ID: WE1C03

ZBSD based detectors : ZBSD & it’s operational principalAntenna coupled ZBSD
Incident THz signal

Si - lens

Rahul Yadav | rahul.yadav@iem.thm.de

𝑈𝑈0 𝑡𝑡 = 𝑈𝑈0 cos(𝜔𝜔𝜔𝜔)
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Paper ID: WE1C03

ZBSD based detectors : ZBSD & it’s operational principalAntenna coupled ZBSD
Incident THz signal

Si - lens

Rahul Yadav | rahul.yadav@iem.thm.de

𝑈𝑈0 𝑡𝑡 = 𝑈𝑈0 cos(𝜔𝜔𝜔𝜔)
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Paper ID: WE1C03

ZBSD based detectors : ZBSD & it’s operational principalAntenna coupled ZBSD
Incident THz signal

Si - lens

Rahul Yadav | rahul.yadav@iem.thm.de

𝑈𝑈0 𝑡𝑡 = 𝑈𝑈0 cos(𝜔𝜔𝜔𝜔)
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Paper ID: WE1C03

ZBSD based detectors : ZBSD & it’s operational principal
 By using Taylor series expansion up-to 2ndorder, diode current is given by:

Antenna coupled ZBSD
Incident THz signal

Si - lens

Rahul Yadav | rahul.yadav@iem.thm.de

𝑈𝑈0 𝑡𝑡 = 𝑈𝑈0 cos(𝜔𝜔𝜔𝜔)
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Paper ID: WE1C03

ZBSD based detectors : ZBSD & it’s operational principal
 By using Taylor series expansion up-to 2ndorder, diode current is given by:

Antenna coupled ZBSD
Incident THz signal

Si - lens𝐼𝐼0 𝑡𝑡 = 𝐴𝐴1 𝑈𝑈0 cos 𝜔𝜔𝜔𝜔 + 𝐴𝐴2 𝑈𝑈0 2 cos 𝜔𝜔𝜔𝜔 + ⋯1
1= 𝐴𝐴1 𝑈𝑈0 cos 𝜔𝜔𝜔𝜔 + 𝐴𝐴2 𝑈𝑈0 2 + 𝐴𝐴2 𝑈𝑈0 cos 2𝜔𝜔𝜔𝜔
2
2





Rahul Yadav | rahul.yadav@iem.thm.de

𝑈𝑈0 𝑡𝑡 = 𝑈𝑈0 cos(𝜔𝜔𝜔𝜔)
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Paper ID: WE1C03

ZBSD based detectors : ZBSD & it’s operational principal
 By using Taylor series expansion up-to 2ndorder, diode current is given by:

Antenna coupled ZBSD

𝐴𝐴2 =





1

𝑅𝑅𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑

Incident THz signal

𝑤𝑤𝑤𝑤𝑤𝑤𝑤𝑤𝑤, 𝐴𝐴1 =Si - lens𝐼𝐼0 𝑡𝑡 = 𝐴𝐴1 𝑈𝑈0 cos 𝜔𝜔𝜔𝜔 + 𝐴𝐴2 𝑈𝑈0 2 cos 𝜔𝜔𝜔𝜔 + ⋯1
1= 𝐴𝐴1 𝑈𝑈0 cos 𝜔𝜔𝜔𝜔 + 𝐴𝐴2 𝑈𝑈0 2 + 𝐴𝐴2 𝑈𝑈0 cos 2𝜔𝜔𝜔𝜔
2
2
1

2 � 𝑅𝑅𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑 � 𝜂𝜂 � 𝑈𝑈𝑇𝑇𝜂𝜂 : ZBSD ideality factor
Rdiff : ZBSD differential resistance
𝑈𝑈𝑇𝑇 : InGaAs thermal voltage

Rahul Yadav | rahul.yadav@iem.thm.de

𝑈𝑈0 𝑡𝑡 = 𝑈𝑈0 cos(𝜔𝜔𝜔𝜔)
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Paper ID: WE1C03

ZBSD based detectors : ZBSD & it’s operational principal
 By using Taylor series expansion up-to 2ndorder, diode current is given by:

Antenna coupled ZBSD

𝐴𝐴2 =

1

𝑅𝑅𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑

1

2 � 𝑅𝑅𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑 � 𝜂𝜂 � 𝑈𝑈𝑇𝑇

Post-detection
electronics

Incident THz signal

𝑤𝑤𝑤𝑤𝑤𝑤𝑤𝑤𝑤, 𝐴𝐴1 =Si - lens𝐼𝐼0 𝑡𝑡 = 𝐴𝐴1 𝑈𝑈0 cos 𝜔𝜔𝜔𝜔 + 𝐴𝐴2 𝑈𝑈0 2 cos 𝜔𝜔𝜔𝜔 + ⋯1
1= 𝐴𝐴1 𝑈𝑈0 cos 𝜔𝜔𝜔𝜔 + 𝐴𝐴2 𝑈𝑈0 2 + 𝐴𝐴2 𝑈𝑈0 cos 2𝜔𝜔𝜔𝜔
22

 The rectified signal is read-out by the post-

detection electronics
𝜂𝜂 : ZBSD ideality factor
 The term 𝐴𝐴2 is directly proportional to detector Rdiff : ZBSD differential resistance2
𝑈𝑈0
𝑈𝑈𝑇𝑇 : InGaAs thermal voltage
responsivity because 𝐼𝐼𝐷𝐷𝐷𝐷 = 𝐴𝐴2 𝑈𝑈0Rahul Yadav | rahul.yadav@iem.thm.de𝑡𝑡 = 𝑈𝑈0 cos(𝜔𝜔𝜔𝜔)
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ZBSD based detectors : antenna analysis

Paper ID: WE1C03



Rahul Yadav | rahul.yadav@iem.thm.de

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ZBSD based detectors : antenna analysis

Paper ID: WE1C03

 Investigation on antenna parameters with1.17 mmvariable dielectric constant

Rahul Yadav | rahul.yadav@iem.thm.de

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ZBSD based detectors : antenna analysis

Paper ID: WE1C03

 Investigation on antenna parameters with1.17 mmvariable dielectric constant

Rahul Yadav | rahul.yadav@iem.thm.de

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ZBSD based detectors : antenna analysis

Paper ID: WE1C03

 Investigation on antenna parameters withvariable dielectric constant

1.17 mm

Channel is 10*8 µm2

Rahul Yadav | rahul.yadav@iem.thm.de

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 Investigation on antenna parameters withvariable dielectric constant

1.17 mm

Channel is 10*8 µm2

Rahul Yadav | rahul.yadav@iem.thm.de

Antenna
S- parameters

ZBSD based detectors : antenna analysis

Paper ID: WE1C03

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 Investigation on antenna parameters withvariable dielectric constant

1.17 mm

Channel is 10*8 µm2

𝑍𝑍𝐴𝐴 =ZA : Antenna radiation impedance
Z0 : Impedance in free space ( 377 Ohm)
𝜀𝜀1 : Air dielectric constant𝜀𝜀2 : Material dielectric constant

Antenna
S- parameters

ZBSD based detectors : antenna analysis

Paper ID: WE1C03

𝑍𝑍02(𝜀𝜀1 + 𝜀𝜀2 )Rahul Yadav | rahul.yadav@iem.thm.de

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 Investigation on antenna parameters withvariable dielectric constantReal ZA𝑍𝑍𝐴𝐴 =ZA : Antenna radiation impedance
Z0 : Impedance in free space ( 377 Ohm)
𝜀𝜀1 : Air dielectric constant𝜀𝜀2 : Material dielectric constant𝑍𝑍02(𝜀𝜀1 + 𝜀𝜀2 )Rahul Yadav | rahul.yadav@iem.thm.de

Imag ZA

Antenna radiation
impedance

1.17 mm

Channel is 10*8 µm2

Antenna
S- parameters

ZBSD based detectors : antenna analysis

Paper ID: WE1C03

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ZBSD based detectors : detector fabrication

Rahul Yadav | rahul.yadav@iem.thm.de

Paper ID: WE1C03

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ZBSD based detectors : detector fabrication

Paper ID: WE1C03

Mask design

Rahul Yadav | rahul.yadav@iem.thm.de

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ZBSD based detectors : detector fabrication

Paper ID: WE1C03

Mask design

ZoomedRahul Yadav | rahul.yadav@iem.thm.de

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ZBSD based detectors : detector fabrication
Mask design

Paper ID: WE1C03

Device fabrication

ZoomedRahul Yadav | rahul.yadav@iem.thm.de

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ZBSD based detectors : detector fabrication
Mask design

Device fabrication

Paper ID: WE1C03

Detector packaging

ZoomedRahul Yadav | rahul.yadav@iem.thm.de

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Paper ID: WE1C03

ZBSD based detectors : in-house characterization

Rahul Yadav | rahul.yadav@iem.thm.de

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Paper ID: WE1C03

ZBSD based detectors : in-house characterization
 Experimental set-up

R. Yadav, et. al, Sensors 2023, 23, 3469.
Rahul Yadav | rahul.yadav@iem.thm.de

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Paper ID: WE1C03

ZBSD based detectors : in-house characterization
 Experimental set-up

CW-Tx: Continuous wave
transmitter
OF: Optical fiber
PM: Parabolic mirror
SD: Schottky diode detector
TIA: Trans-impedance amplifier
R. Yadav, et. al, Sensors 2023, 23, 3469.

 Toptica TeraScan 1550
 THz Power:
100 GHz ~ 100 µW
1 THz ~ 1 µW

𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷 𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 𝑑𝑑𝑑𝑑 = 20 × 𝑙𝑙𝑙𝑙𝑙𝑙10 (𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅 𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠 𝑏𝑏𝑏𝑏 𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑)
𝑁𝑁𝑁𝑁𝑁𝑁𝑁𝑁𝑁𝑁 𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓 𝑜𝑜𝑜𝑜 𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑

Rahul Yadav | rahul.yadav@iem.thm.de

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Paper ID: WE1C03

ZBSD based detectors : in-house characterization
 Experimental set-up

CW-Tx: Continuous wave
transmitter
OF: Optical fiber
PM: Parabolic mirror
SD: Schottky diode detector
TIA: Trans-impedance amplifier
R. Yadav, et. al, Sensors 2023, 23, 3469.

 Toptica TeraScan 1550
 THz Power:
100 GHz ~ 100 µW
1 THz ~ 1 µW

𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷 𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 𝑑𝑑𝑑𝑑 = 20 × 𝑙𝑙𝑙𝑙𝑙𝑙10 (𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅 𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠 𝑏𝑏𝑏𝑏 𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑)
𝑁𝑁𝑁𝑁𝑁𝑁𝑁𝑁𝑁𝑁 𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓 𝑜𝑜𝑜𝑜 𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑

Rahul Yadav | rahul.yadav@iem.thm.de

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Paper ID: WE1C03

ZBSD based detectors : FEL at ELBE, HZDR, Germany

M. Helm, et. al, Eur. Phys. J. Plus 138, 158 (2023).
Rahul Yadav | rahul.yadav@iem.thm.de

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Paper ID: WE1C03

ZBSD based detectors : with FELBE characterization

Rahul Yadav | rahul.yadav@iem.thm.de

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12

Paper ID: WE1C03

ZBSD based detectors : with FELBE characterization
 Experimental set-up

LNA: Low noise amplifier
M: Mirror
PM: Parabolic mirror
TIA: Trans-impedance amplifier
SD: Schottky diode detector
R. Yadav, et. al, Sensors 2023, 23, 3469.
Rahul Yadav | rahul.yadav@iem.thm.de

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Paper ID: WE1C03

ZBSD based detectors : with FELBE characterization
 Experimental set-up

Fast measurements

Slow measurements

Oscilloscope

Lock-in amplifier with chopper

Higher THz power as no
chopper

Lower THz power due tochopper

Not temperaturedependent

Temperature dependent(Bolometric effects)

Use for THz pulse
detection andsynchronization

Use to investigate detectors
working principle anddevelopments

LNA: Low noise amplifier
M: Mirror
PM: Parabolic mirror
TIA: Trans-impedance amplifier
SD: Schottky diode detector
R. Yadav, et. al, Sensors 2023, 23, 3469.
Rahul Yadav | rahul.yadav@iem.thm.de

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Paper ID: WE1C03

ZBSD based detectors : with FELBE characterization
 Slow measurements

Comparison of in-house (table-top) and FELBE measurementsmA

 Responsivity of 102 W from
0.2 to 0.6 THz
pW NEP of 10 Hz

from 0.2 to 0.6 THz
 Responsivity roll-off 𝑓𝑓 −6

R. Yadav, et. al, Sensors 2023, 23, 3469.
Rahul Yadav | rahul.yadav@iem.thm.de

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Paper ID: WE1C03

ZBSD based detectors : with FELBE characterization
 Slow measurements

Comparison of in-house (table-top) and FELBE measurementsmA

 Responsivity of 102 W from
0.2 to 0.6 THz
pW NEP of 10 Hz

from 0.2 to 0.6 THz
 Responsivity roll-off 𝑓𝑓 −6

R. Yadav, et. al, Sensors 2023, 23, 3469.

Note: Table-top (in-house results here are not with same device as in slide 10)
Rahul Yadav | rahul.yadav@iem.thm.de

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13

Paper ID: WE1C03

ZBSD based detectors : with FELBE characterization

Rahul Yadav | rahul.yadav@iem.thm.de

Seite

14

Paper ID: WE1C03

ZBSD based detectors : with FELBE characterization
Fast measurement at 1.99 THz with FEL

FWHM of 60 ps
THz power = 0.49 mW

Rahul Yadav | rahul.yadav@iem.thm.de

Seite

14

Paper ID: WE1C03

ZBSD based detectors : with FELBE characterization
Fast measurement at 1.99 THz with FEL

Fast measurement at 4.84 THz with FEL

FWHM of 80 ps

FWHM of 60 ps

THz power = 0.69 mW

THz power = 0.49 mW

Rahul Yadav | rahul.yadav@iem.thm.de

Seite

14

Paper ID: WE1C03

ZBSD based detectors : with FELBE characterization

Rahul Yadav | rahul.yadav@iem.thm.de

Seite

15

Paper ID: WE1C03

ZBSD based detectors : with FELBE characterization
Fast measurements

Rahul Yadav | rahul.yadav@iem.thm.de

Seite

15

Paper ID: WE1C03

ZBSD based detectors : with FELBE characterization
Fast measurements

Slow and fast measurement comparison

R. Yadav, et. al, Sensors 2023, 23, 3469.
Rahul Yadav | rahul.yadav@iem.thm.de

Seite

15

Paper ID: WE1C03

Summary Requirement of having direct THz detectors
 Working principle of ZBSD based THz detectors
 Si-lens coupling for broadband THz detectors
 Analysis of antenna performance for ZBSD THz
detectors

mA

pW

 Responsivity of 102 W and NEP of 10 Hz from
0.2 to 0.6 THz
 Study on bolometric and thermal
rectifying effects in ZBSD
 Variation of ZBSD THz detectors noise
floor at higher THz frequencies


Rahul Yadav | rahul.yadav@iem.thm.de

Seite

16

Paper ID: WE1C03

Summary Requirement of having direct THz detectors
 Working principle of ZBSD based THz detectors
 Si-lens coupling for broadband THz detectors
 Analysis of antenna performance for ZBSD THz
detectors

mA

pW

 Responsivity of 102 W and NEP of 10 Hz from
0.2 to 0.6 THz
 Study on bolometric and thermal
rectifying effects in ZBSD
 Variation of ZBSD THz detectors noise
floor at higher THz frequencies
 Components of ZBSD THz detectors

Rahul Yadav | rahul.yadav@iem.thm.de

Seite

16

Paper ID: WE1C03

Summary Requirement of having direct THz detectors
 Working principle of ZBSD based THz detectors
 Si-lens coupling for broadband THz detectors
 Analysis of antenna performance for ZBSD THz
detectors

mA

pW

 Responsivity of 102 W and NEP of 10 Hz from
0.2 to 0.6 THz
 Study on bolometric and thermal
rectifying effects in ZBSD
 Variation of ZBSD THz detectors noise
floor at higher THz frequencies
 Components of ZBSD THz detectors

Rahul Yadav | rahul.yadav@iem.thm.de

Seite

16

Paper ID: WE1C03

Outlook Investigation on broadband

and narrow-band planarantennas for future ZBSD THz
detectors and their fabrication







Rahul Yadav | rahul.yadav@iem.thm.de

Seite

17

Paper ID: WE1C03

Outlook Investigation on broadband

and narrow-band planarantennas for future ZBSD THz
detectors and their fabrication

Log-spiral antenna (LSA)

Smaller log-spiral antenna (SLSA)

H - dipole (HD)Folded dipole (FD)
Rahul Yadav | rahul.yadav@iem.thm.de

Seite

17

Paper ID: WE1C03

Outlook Investigation on broadband

and narrow-band planar
Log-spiral antenna (LSA)
antennas for future ZBSD THz
detectors and their fabrication
 Selection of optimum flexible
transition between active
device (ZBSD) andSmaller log-spiral antenna (SLSA)
intermediate frequency (IF)circuitH - dipole (HD)Folded dipole (FD)
Rahul Yadav | rahul.yadav@iem.thm.de

Seite

17

Paper ID: WE1C03

Outlook Investigation on broadband

and narrow-band planar
Log-spiral antenna (LSA)
antennas for future ZBSD THz
detectors and their fabrication
 Selection of optimum flexible
transition between active
device (ZBSD) andSmaller log-spiral antenna (SLSA)
intermediate frequency (IF)circuit Investigation and fabrication of
H - dipole (HD)IF circuit components


Folded dipole (FD)
Rahul Yadav | rahul.yadav@iem.thm.de

Seite

17

Paper ID: WE1C03

Outlook Investigation on broadband

and narrow-band planar
Log-spiral antenna (LSA)
antennas for future ZBSD THz
detectors and their fabrication
 Selection of optimum flexible
transition between active
device (ZBSD) andSmaller log-spiral antenna (SLSA)
intermediate frequency (IF)circuit Investigation and fabrication of
H - dipole (HD)IF circuit components
 Integration of amplifier inside
the same housing as THz
detector
Folded dipole (FD)
Rahul Yadav | rahul.yadav@iem.thm.de

Seite

17

Paper ID: WE1C03

Thank you for your attention and questions are welcome
Team @ THM

Team @ TU Darmstadt

This work is supported by the German Federal Ministry of Education and Research (BMBF) under contract no. 05K22RO1 and Hesse ministry of science and culture.

Rahul Yadav | rahul.yadav@iem.thm.deSeite18