Journal Articles (11)

• Muehlbrandt, S.; Harter, T.; Fuellner, C.; Ummethala, S.; Wolf, S.; Bacher, A.; Hahn, L.; Kohl, M.; Freude, W.; Koos, C.
  Field-effect silicon-plasmonic photodetector for coherent T-wave reception
  Opt. Express 29, 21586-21602 (2021) [DOI]


• Ummethala, S.; Alam, A. S.; Lauermann, M.; Kuzmin, A.; Kutuvantavida, Y.; Nandam, S. H.; Hahn, L.; Elder, D. L.; Dalton, L. R.; Zwick, T.; Randel, S.; Freude, W.; Koos, C.; Kemal, J. N.
  Hybrid Electro-Optic Modulator Combining Silicon Photonic Slot Waveguides with High-k Radio-Frequency Slotlines
  Optica 8, 511-519 (2021) [DOI]


• Harter, T.; Fuellner, C.; Kemal, J. N.; Ummethala, S.; Steinmann, J. L.; Brosi, J.-M.; Hesler, J. L.; Bruendermann, E.; Mueller, A.-S.; Freude, W.; Randel, S.; Koos, C.
  Generalized Kramers–Kronig receiver for coherent terahertz communications
  Nature Photonics 14, 601-606 (2020) more


• Harter, T.; Ummethala, S.; Blaicher, M.; Muehlbrandt, S.; Wolf, S.; Weber, M.; Adib, M. M. H.; Kemal, J. N.; Merboldt, M.; Boes, F.; Nellen, S.; Tessmann, A.; Walther, M.; Globisch, B.; Zwick, T.; Freude, W.; Randel, S.; Koos, C.
  Wireless THz link with optoelectronic transmitter and receiver
  Optica 6, 1063--1070 (2019) [DOI]


• Ummethala, S.; Harter, T.; Koehnle, K.; Li, Z.; Muehlbrandt, S.; Kutuvantavida, Y.; Kemal, J. N.; Marin-Palomo, P.; Schaefer, J.; Tessmann, A.; Garlapati, S. K.; Bacher, A.; Hahn, L.; Walther, M.; Zwick, T.; Randel, S.; Freude, W.; Koos, C.
  THz-to-optical conversion in wireless communications using an ultra-broadband plasmonic modulator
  Nature Photonics 13, 519-524 (2019) [DOI]


• Harter, T.; Muehlbrandt, S.; Ummethala, S.; Schmid, A.; Nellen, S.; Hahn, L.; Freude, W.; Koos, C.
  Silicon–plasmonic integrated circuits for terahertz signal generation and coherent detection
  Nature Photonics, 625–633 (2018) [DOI]


• Harter, T.; Muehlbrandt, S.; Ummethala, S.; Schmid, A.; Nellen, S.; Hahn, L.; Freude, W.; Koos, C.
  Silicon–plasmonic integrated circuits for terahertz signal generation and coherent detection
  Nature Photonics 12, 625--633 (2018) [DOI]


• Koos, C.; Leuthold, J.; Freude, W.; Kohl, M.; Dalton, L. R.; Bogaerts, W.; Giesecke, A. L.; Lauermann, M.; Melikyan, A.; Koeber, S.; Wolf, S.; Weimann, C.; Muehlbrandt, S.; Koehnle, K.; Pfeifle, J.; Hartmann, W.; Kutuvantavida, Y.; Ummethala, S.; Palmer, R.; Korn, D.; Alloatti, L.; Schindler, P. C.; Elder, D. L.; Wahlbrink, T.; Bolten, J.
  Silicon-Organic Hybrid (SOH) and Plasmonic-Organic Hybrid (POH) Integration
  J. Lightwave Technol. 34, 01-13 (2016) [DOI] more, (invited)


• Rath, P.; Ummethala, S.; Nebel, C.; Pernice, W. H. P.
  Diamond as a material for monolithically integrated optical and optomechanical devices
  physica status solidi (a) 212, 2385--2399 (2015) [DOI]


• Rath, P.; Ummethala, S.; Diewald, S.; Lewes-Malandrakis, G.; Brink, D.; Heidrich, N.; Nebel, C.; Pernice, W. H. P.
  Diamond electro-optomechanical resonators integrated in nanophotonic circuits
  Applied Physics Letters 105 (2014) [DOI]


• Ummethala, S.; Rath, P.; Lewes-Malandrakis, G.; Brink, D.; Nebel, C.; Pernice, W. H. P.
  High-Q optomechanical circuits made from polished nanocrystalline diamond thin films
  Diamond and Related Materials 44, 49 - 53 (2014) [DOI]

Conference Contributions (15)

• Freude, W.; Harter, T.; Muehlbrandt, S.; Ummethala, S.; Fang, D.; Randel, S.; Koos, C.
  THz carrier processing and optical arbitrary waveform measurement employing integrated silicon photonics
  Advanced Photonics Congress (APC-Networks 2023), Busan, South Korea, July 9–13 , Paper NeM4B.4 (2023) [DOI] (invited)


• Koos, C.; Randel, S.; Freude, W.; Zwick, T.; Scheytt, J. C.; Witzens, J.; Walther, M.; Harter, T.; Ummethala, S.; Kieninger, C.; Zwickel, H.; Marin-Palomo, P.; Muehlbrandt, S.; Fuellner, C.; Schaefer, J.; Gudyriev, S.; Zazzi, A.; Mueller, J.; Tessmann, A.
  Photonic-Electronic Ultra-Broadband Signal Processing: Concepts, Devices, and Applications
  2020 IEEE BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium (BCICTS’20), Monterey (CA) USA, Nov. 16-19 (2020) [DOI]


• Ummethala, S.; Pammi, V. A.; Uddin, A. H. M.; Hahn, L.; Freude, W.; Koos, C.
  Horizontal-Slot Plasmonic-Organic Hybrid (POH) Modulator
  2020 Conference on Lasers and Electro-Optics (CLEO), San Jose (CA), USA, May 10-15 , paper SM2J.4 (2020) [DOI] more


• Randel, S.; Harter, T.; Fuellner, C.; Ummethala, S.; Koos, C.; Freude, W.
  Opto-Electronic Terahertz Transceivers for Wireless 5G Backhaul
  Optical Fiber Communication Conference (OFC'20), San Diego (CA), USA, March 08–12 , paper M4I.6 (2020) (invited)


• Harter, T.; Fuellner, C.; Kemal, J. N.; Ummethala, S.; Steinmann, J. L.; Brosi, J.-M.; Hesler, J. L.; Bruendermann, E.; Freude, W.; Randel, S.; Koos, C.
  Generalized Kramers-Kronig Receiver for 16QAM Wireless THz Transmission at 110 Gbit/s
  45th European Conference on Optical Communication (ECOC'19), Dublin, Ireland, September 22-26 , paper Th.2.C.4 (2019) [DOI] more


• Freude, W.; Harter, T.; Muehlbrandt, S.; Ummethala, S.; Nellen, S.; Hahn, L.; Randel, S.; Koos, C.
  Silicon photonics for coherent terahertz generation and detection
  21th Intern. Conf. on Transparent Optical Networks (ICTON'19), Angers, France, July 9-13 , paper 8840408 (2019) [DOI] (invited)


• Freude, W.; Harter, T.; Ummethala, S.; Muehlbrandt, S.; Blaicher, M.; Wolf, S.; Weber, M.; Boes, F.; Massler, H.; Tessmann, A.; Kutuvantavida, Y.; Kemal, J. N.; Nellen, S.; Hahn, L.; Globisch, B.; Walther, M.; Zwick, T.; Randel, S.; Koos, C.
  Wireless Terahertz Communications
  Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), pp. 1-1 , paper 8873098 (2019) [DOI]


• Ummethala, S.; Kemal, J. N.; Lauermann, M.; Alam, A. S.; Zwickel, H.; Harter, T.; Kutuvantavida, Y.; Hahn, L.; Nandam, S. H.; Elder, D. L.; Dalton, L. R.; Freude, W.; Randel, S.; Koos, C.
  Capacitively Coupled Silicon-Organic Hybrid Modulator for 200 Gbit/s PAM-4 Signaling
  Conf. on Lasers and Electro-Optics (CLEO'19), San Jose (CA), USA, May 5–10 , paper JTh5B.2 Optical Society of America (2019) [DOI] more


• Ummethala, S.; Harter, T.; Koehnle, K.; Li, Z.; Muehlbrandt, S.; Kutuvantavida, Y.; Kemal, J. N.; Schaefer, J.; Massler, H.; Tessmann, A.; Kumar Garlapati, S.; Bacher, A.; Hahn, L.; Walther, M.; Zwick, T.; Randel, S.; Freude, W.; Koos, C.
  Wireless Transmission at 0.3 THz Using Direct THz-to-Optical Conversion at the Receiver
  44th European Conference on Optical Communication (ECOC'18), Rome, Italy, September 23-27 , paper We4H.3 (2018) [DOI] (invited)


• Harter, T.; Fuellner, C.; Kemal, J. N.; Ummethala, S.; Brosi, J.-M.; Bruendermann, E.; Freude, W.; Randel, S.; Koos, C.
  110-m THz Wireless Transmission at 100 Gbit/s Using a Kramers-Kronig Schottky Barrier Diode Receiver
  44th European Conference on Optical Communication (ECOC'18), Rome, Italy, September 23-27 , paper Th3F.7 (2018) [DOI]


• Koos, C.; Randel, S.; Freude, W.; Dalton, L. R.; Wolf, S.; Kieninger, C.; Kutuvantavida, Y.; Lauermann, M.; Elder, D. L.; Muehlbrandt, S.; Zwickel, H.; Melikyan, A.; Harter, T.; Ummethala, S.; Billah, M. R.; Blaicher, M.; Dietrich, P.-I.; Hoose, T.
  Hybrid Photonic Integration and Plasmonic Devices: New Perspectives for High-Speed Communications and Ultra-Fast Signal Processing
  Pacific Rim Conference on Lasers and Electro-Optics (CLEO-PR 2018), Hong Kong, July 29 – August 3 , pp. 1-2 (2018) [DOI] more (invited)


• Ummethala, S.; Harter, T.; Koehnle, K.; Muehlbrandt, S.; Kutuvantavida, Y.; Kemal, J. N.; Schaefer, J.; Massler, H.; Tessmann, A.; Kumar Garlapati, S.; Bacher, A.; Hahn, L.; Walther, M.; Zwick, T.; Randel, S.; Freude, W.; Koos, C.
  Terahertz-to-Optical Conversion Using a Plasmonic Modulator
  Conf. on Lasers and Electro-Optics (CLEO'18), San Jose (CA), USA, May 13–18 , paper STu3D.4 (2018) [DOI] more


• Ummethala, S.; Harter, T.; Kohnle, S.; Muehlbrandt, S.; Kutuvantavida, Y.; Kemal, J. N.; Schaefer, J.; Massler, H.; Tessmann, A.; Garlapati, S. K.; Bacher, A.; Hahn, L.; Walther, M.; Zwick, T.; Randel, S.; Freude, W.; Koos, C.
  Terahertz-to-Optical Conversion Using a Plasmonic Modulator
  Conference on Lasers and Electro-Optics, OSA Technical Digest (online) (Optica Publishing Group, 2018) , paper STu3D.4 (2018) [DOI]


• Harter, T.; Muehlbrandt, S.; Ummethala, S.; Schmid, A.; Bacher, A.; Hahn, L.; Kohl, M.; Freude, W.; Koos, C.
  Silicon-Plasmonic Photomixer for Generation and Homodyne Reception of Continuous-Wave THz Radiation
  Conf. on Lasers and Electro-Optics (CLEO'16), San Jose (CA), USA, June 5 – 10 , paper SM4E.5. (2016) [DOI]


• Rath, P.; Ummethala, S.; Diewald, S.; Lewes-Malandrakis, G.; Brink, D.; Heidrich, N.; Nebel, C.; Pernice, W. H. P.
  Diamond Electro-optomechanical Devices with Resonance Frequencies above 100 MHz
  41th European Conf. Opt. Commun. (ECOC'15), Valencia, Spain, Sept. 27 – Oct. 1 , STh3I.1 Optical Society of America (2015) [DOI]

Lectures (6)

• Koos, C.; Kippenberg, T. J.; Randel, S.; Freude, W.; Zwick, T.; Scheytt, J. C.; Witzens, J.; Fang, D.; Drayss, D.; Harter, T.; Ummethala, S.; Kieninger, C.; Zwickel, H.; Marin-Palomo, P.; Fuellner, C.; Billah, M. R.; Blaicher, M.; Xu, Y.; Lauermann, M.; Skacel, S.; Lihachev, G.; Schaefer, J.; Gudyriev, S.; Zazzi, A.; Mueller, J.
  Terahertz Analogue-to-Digital Conversion Using Soliton Frequency Combs and Massively Parallel Spectrally Sliced Detection (TeraSlice)
  International Workshop on Mobile THz Systems (IWMTS), online event, Duisburg, Germany, July 5 – 7 (2021) (invited)


• Koos, C.; Randel, S.; Freude, W.; Yokoyama, S.; Dalton, L. R.; Zwickel, H.; Kieninger, C.; Wolf, S.; Kutuvantavida, Y.; Lauermann, M.; Miura, H.; Qiu, F.; Elder, D. L.; Ummethala, S.; Billah, M. R.; Blaicher, M.; Dietrich, P.-I.; Trappen, M.; Hoose, T.
  Hybrid Photonic Integration and 3D Nano-Printing: Combining Silicon Photonics with Organic Materials
  IEEE CPMT Symposium Japan (ICSJ 2019); Kyoto, Japan, November 18-20 (2019) (invited)


• Freude, W.; Ummethala, S.; Harter, T.; Koehnle, K.; Li, Z.; Muehlbrandt, S.; Kutuvantavida, Y.; Kemal, J. N.; Marin-Palomo, P.; Schaefer, J.; Tessmann, A.; Kumar Garlapati, S.; Bacher, A.; Hahn, L.; Walther, M.; Zwick, T.; Randel, S.; Koos, C.
  Wireless THz-to-optical conversion with an electro-optic plasmonic modulator
  Light: Science & Applications, Light Conference (Light Conference'19), Changchun, China, July 16-18 (2019) (invited)


• Freude, W.; Harter, T.; Ummethala, S.; Muehlbrandt, S.; Blaicher, M.; Wolf, S.; Weber, M.; Boes, F.; Massler, H.; Tessmann, A.; Kutuvantavida, Y.; Kemal, J. N.; Nellen, S.; Hahn, L.; Goebel, T.; Walther, M.; Zwick, T.; Randel, S.; Koos, C.
  Terahertz communications meets photonics
  14th Intern. Conf. on Fiber Optics & Photonics (Photonics'18), Indian Institute of Technology Delhi (IIT Delhi), Delhi, India, December 12–15 (2018) (invited)


• Harter, T.; Ummethala, S.; Muehlbrandt, S.; Blaicher, M.; Koehnle, K.; Adib, M. M. H.; Weber, M.; Wolf, S.; Kutuvantavida, Y.; Kemal, J. N.; Nellen, S.; Hahn, L.; Tessmann, A.; Walther, M.; Zwick, T.; Randel, S.; Freude, W.; Koos, C.
  Wireless terahertz communications using optoelectronic techniques
  40th Progress In Electromagnetics Research Symposium (PIERS 2018), Toyama, Japan, 01.08.2018 – 04.08.2018 (2018)


• Freude, W.; Harter, T.; Ummethala, S.; Muehlbrandt, S.; Blaicher, M.; Wolf, S.; Weber, M.; Boes, F.; Massler, H.; Tessmann, A.; Kutuvantavida, Y.; Kemal, J. N.; Nellen, S.; Hahn, L.; Goebel, T.; Walther, M.; Zwick, T.; Randel, S.; Koos, C.
  Wireless THz communications using optoelectronic techniques
  Light: Science & Applications, Light Conference (Light Conference'18), Changchun, China, July 16-18 (2018) (invited)

Workshops (1)

• Koos, C.; Kippenberg, T. J.; Randel, S.; Freude, W.; Zwick, T.; Scheytt, J. C.; Witzens, J.; Fang, D.; Drayss, D.; Harter, T.; Ummethala, S.; Kieninger, C.; Zwickel, H.; Marin-Palomo, P.; Fuellner, C.; Billah, M. R.; Blaicher, M.; Xu, Y.; Lauermann, M.; Skacel, S.; Lihachev, G.; Schaefer, J.; Gudyriev, S.; Zazzi, A.; Mueller, J.
  Terahertz Analogue-to-Digital Conversion Using Soliton Frequency Combs and Massively Parallel Spectrally Sliced Detection (TeraSlice)
  (2021)

Further publications (1)

• Ummethala, S.
  Plasmonic-Organic and Silicon-Organic Hybrid Modulators for High-Speed Signal Processing
  PhD Thesis (2021)