220-to-320 GHz Manifold Triplexer with Wide Stop-Band Utilizing Ridged Substrate Integrated Waveguides
J. W. Holloway, Georgios Dogiamis, Sanghoon Shin and R. Han
to be submitted to IEEE Trans. on Microwave Theory and Techniques (T-MTT)

High-Scalability CMOS Quantum Magnetometer with Spin-State Excitation and Detection of Diamond Color Centers
M. I. Ibrahim*, C. Foy*, D. R. Englund^† and R. Han^†            (*: equal contribution, ^†: corresponding authors)
submitted to IEEE Journal of Solid-State Circuits.

Innovations in Terahertz Interconnects: High-Speed Data Transport Over Fully-Electrical Terahertz Waveguide Links (PDF)
J. Holloway, Georgios C. Dogiamis, and R. Han
IEEE Microwave Magazine, vol. 21, no. 1, Jan. 2020.

Opening Terahertz for Everyday Applications
K. K. O, W. Choi, Q. Zhong, N. Sharma, Y. Zhang, R. Han, Z. Ahmad, D.-Y. Kim, K. Shattry, I. Medvedev, D. Lary, H.-J. Nam, P. Raskin, and I. Kim
IEEE Communications Magazine, vol. 57, no. 8, Aug. 2019.

Filling the Gap with Sand (PDF)
S. Naghavi, M. Taba, R. Han, M. Aseeri, A. Cathelin, and E. Afshari
IEEE Solid-State Circuits Magazine, Summer 2019.

A CMOS-Integrated Quantum Sensor Based on Nitrogen-Vacancy Centres (Link)
D. Kim*, M. I. Ibrahim*, C. Foy*, M. E. Trusheim, R. Han^† and D. R. Englund^†           (*: equal contribution, ^†: corresponding authors)
Nature Electronics, vol. 2, July 2019.

• Also see Nature Electronics' News and Views: "Silicon Integration for Quantum Sensing" by A. Dzurak  (PDF) and Editorial: "CMOS with a Spin" (PDF)

Chip-Scale Terahertz Carbonyl Sulfide (OCS) Clock: An Overview and Recent Studies on Long-Term Frequency Stability of OCS Transitions (PDF)
M. Kim, C. Wang, Z. Hu and R. Han
IEEE Transactions on Terahertz Science and Technology, vol. 9, no. 4, July 2019. (Invited)

A 32-Unit 240-GHz Heterodyne Receiver Array in 65-nm CMOS with Array-Wide Phase Locking (PDF)
Z. Hu, C. Wang and R. Han
IEEE Journal of Solid-State Circuits (JSSC), vol. 54, no. 5, May 2019. (Invited)

Chip-Scale Molecular Clock (PDF)
C. Wang, X. Yi, J. Mawdsley, M. Kim, Z. Hu, Y. Zhang, B. Perkins and R. Han
IEEE Journal of Solid-State Circuits (JSSC), vol. 54, no. 4, 2019. (Invited)

High-Power Radiation at 1 THz in Silicon: A Fully Scalable Array Using A Multi-Functional Radiating Mesh Structure (PDF)
Z. Hu, M. Kaynak and R. Han
IEEE Journal of Solid-State Circuits (JSSC), RFIC Special Issue, May 2018. (Invited)

Molecular Detection for Unconcentrated Gas with ppm Sensitivity Using Dual-THz-Comb Spectrometer in CMOS (PDF)
C. Wang, Bradford Perkins, Zihan Wang and R. Han
IEEE Transactions on Biomedical Circuits and Systems, vol. 12, no. 3, pp. 709-721, June 2018 (Invited)

A Dual-Terahertz-Comb Spectrometer on CMOS for Rapid, Wide-Range Gas Detection with Absolute Specificity (PDF)
C. Wang and R. Han
IEEE Journal of Solid-State Circuits (JSSC), vol. 56, no. 12, Dec. 2017. (Invited)

A Fully-integrated Broadband THz Chip-to-Chip Interconnect (PDF)
J. W. Holloway, L. Boglione, T. M. Hancock, and R. Han
IEEE Trans. on Microwave Theory and Techniques (T-MTT), vol. 65, no. 7, July 2017

A Fully-integrated 320-GHz Coherent Imaging Transceiver in 130-nm SiGe BiCMOS (PDF)
C. Jiang, A. Mostajeran, R. Han, M. Emadi, H. Sherry, A. Cathelin, and E. Afshari
IEEE Journal of Solid-State Circuits (JSSC), vol. 51, no. 11, Nov. 2016

Design and Demonstration of 820-GHz Array Using Diode-Connected NMOS Transistors in 130-nm CMOS for Active Imaging (PDF)
D. Y. Kim, S. Park, R. Han, and K. K. O
IEEE Transactions on Terahertz Science and Technology, vol. 6, no. 2, Mar. 2016

A 320-GHz Heterodyne Imaging Transmitter with 3.3-mW Radiated Power and Fully-Integrated Phase-Locked Loop (PDF)
R. Han, C. Jiang, A. Mostajeran, M. Emadi, H. Aghasi, H. Sherry, A. Cathelin, and E. Afshari
IEEE Journal of Solid-State Circuits (JSSC), vol. 50, no. 12, Dec. 2015. (Invited)

A CMOS High-Power Broadband 260-GHz Radiator Array For Spectroscopy (PDF)
R. Han and E. Afshari
IEEE Journal of Solid-State Circuits (JSSC), vol. 50, no. 12, Dec. 2013. (Invited)

Active Terahertz Imaging Using Schottky Diodes in CMOS: Array and 860-GHz Pixel (PDF)
R. Han, Y. Zhang, Y. Kim, D. Kim, H. Shichijo, E. Afshari and K. K. O
IEEE Journal of Solid-State Circuits (JSSC), vol. 48, no. 10, Oct. 2013

A High-Power Broadband Passive Terahertz Frequency Doubler in CMOS (PDF)
R. Han and E. Afshari
IEEE Transactions on Microwave Theory and Techniques (T-MTT), vol. 61, no. 3, Mar. 2013. (Invited)

Broadband Root Mean Square Detector in CMOS for On-Chip Measurements of Millimeter-Wave Voltages (PDF)
C. Lee, W. Choi, R. Han, H. Shichijo and K. K. O
IEEE Electron Device Letters (EDL), vol. 33, no. 6, pp. 752-754, June 2012

A 280-GHz Schottky Diode Detector in 130-nm Digital CMOS (PDF)
R. Han, Y. Zhang, D. Coquillat, W. Knap, E. Brown and K. K. O
IEEE Journal of Solid-State Circuits (JSSC), vol. 46, no. 11, pp. 2602-2612, Nov. 2011

Progress and Challenges Towards Terahertz CMOS Integrated Circuits (PDF)
E. Seok, D. Shim, C. Mao, R. Han, S. Sankaran, C. Cao, W. Knap and K. K. O
IEEE Journal of Solid-State Circuits (JSSC), vol. 45, no. 8, pp. 1554-1564, Aug. 2010

Multi-level Amplitude Modulation of a 16.8-GHz Class-E Power Amplifier with Negative Resistance Enhanced Power Gain for 400-Mbps Data Transmission (PDF)
H. Wu, R. Han, W. Lerdsitsomboon, C. Cao and K. K. O
IEEE Journal of Solid-State Circuits (JSSC), vol. 45, no. 5, pp. 1072-1079, May 2010

Millimeter-Wave to Terahertz in CMOS
K. K. O, S. Sankaran, C. Cao, E. Seok, D. Shim, C. Mao and R. Han
Int. Journal of High-Speed Electronics and Systems, vol. 19, no. 1, pp. 55-67, Jan. 2009

THzID: A 1.6mm² Package-Less Cryptographic Identification Tag with Backscattering and Beam-Steering at 260GHz
M. Ibrahim, M. I. Khan, C. Juvekar, W. Jung, R. Yazicigil, A. Chandrakasan, and R. Han
IEEE Intl. Solid-State Circuit Conf. (ISSCC), San Francisco, CA, Feb. 2020.

A Terahertz FMCW Comb Radar in 65nm CMOS with 100GHz Bandwidth
X. Yi, C. Wang, M. Lu, J. Wang, J. Grajal and R. Han
IEEE Intl. Solid-State Circuit Conf. (ISSCC), San Francisco, CA, Feb. 2020.

Sub-THz CMOS Molecular Clock with 43ppt Long-Term Stability Using High-Order Rotational Transition Probing and Slot Array Couplers
C. Wang, X. Yi, M. Kim and R. Han
IEEE Intl. Solid-State Circuit Conf. (ISSCC), San Francisco, CA, Feb. 2020.

A Molecular Clock Architecture for Deep Space Inter-SmallSat Radio Occultation
Lin Yi, Mina Kim, Zhi Hu, Chi Ao, Eric Burt, Robert Tjoelker, Imran Mehdi, and Ruonan Han
Institute of Navigation (ION) Precise Time and Time Interval Systems and Applications (PTTI) Meeting, Jan. 2020.

Principles and Prototypes of Chip-Scale Molecular Clock (Video)
R. Han, C. Wang, M. Kim, X. Yi, Z. Hu and J. Mawdesley
IEEE International Frequency Control Symposium (IFCS), Orlando, FL, April 2019. (Invited)

High-Precision Probing of Molecules Using THz CMOS Chips: Principles and Applications in High-Accessibility Sensors and Clocks (PDF)
C. Wang, M. Kim, Z. Hu and R. Han
invited talk at IEEE Global Symp. on Millimeter Waves (GSMM), Sendai, Japan, May 2019.

Quantum Sensing in CMOS under Ambient Conditions: On-Chip Detection of Electronic Spin States in Diamond
C. Foy, M. I. Ibrahim, D. Kim, D. Englund, R. Han, M. Trusheim
Conf. on Lasers and Electro-Optics (CLEO), San Jose, CA, May 2019.

CMOS-Integrated Diamond Nitrogen-Vacancy Quantum Sensor
C. Foy, M. I. Ibrahim, D. Kim, M. Trusheim, D. Englund, R. Han
Bulletin of the American Physical Society (APS), Boston, MA, Mar. 2019.

A Scalable Quantum Magnetometer in 65nm CMOS with Vector-Field Detection Capability (PDF) (Slides)
M. I. Ibrahim, C. Foy, D. Englund and R. Han
IEEE Intl. Solid-State Circuit Conf. (ISSCC), San Francisco, CA, Feb. 2019.

Room-Temperature Quantum Sensing in CMOS: On-Chip Detection of Electronic Spin States in Diamond Color Centers for Magnetometry
M. I. Ibrahim*, C. Foy*, D. Kim*, D. R. Englund and R. Han (* Equal Contribution)
IEEE VLSI Circuits Symposium, Honolulu, HI, Jun. 2018 (PDF) (Slides)

A CMOS Molecular Clock Probing 231.061-GHz Rotational Line of OCS with Sub-ppb Long-Term Stability and 66-mW DC Power
C. Wang, X. Yi, M. Kim, Y. Zhang and R. Han
IEEE VLSI Circuits Symposium, Honolulu, HI, Jun. 2018. (Selected as the Technical Highlight of the Conference)  (PDF) (Slides)

Heterodyne Sensing CMOS Array with High Density and Large Scale: A 240-GHz, 32-Unit Receiver Using A De-Centralized Architecture
Z. Hu, C. Wang and R. Han
IEEE Radio-Frequency Integrated Circuit Symposium (RFIC), Philadelphia, PA, Jun. 2018. (PDF) (Slides)

CMOS-Based THz Spectrometers: From Gas Sensing to Time-Keeping
C. Wang, Z. Hu, J. Mawdsley, M. Kim, Y. Xiang and R. Han
invited to IEEE Radio & Wireless Week/Topical Meetings on Silicon Monolithic Integrated Circuits in RF Systems (SiRF), Orlando, FL, Jan. 2019.

Metamaterial Absorber for THz Polarimetric Sensing
B. Wang, A. Sadeqi, R. Ma, P. Wang, W. Tsujita, K. Sadamoto, Y. Sawa, H. Nejad, S. Sonkusale, C. Wang, M. Kim, and R. Han
SPIE Photonics West, San Francisco, CA, Jan. 2018.

On-Chip Interactions of Wave and Matter: From RF-to-Photonic Devices to Applications
R. Han
IEEE 14th Intl. Conf. Solid-State & Integrated Circuit Tech., Qingdao, China, Nov. 2018. (Invited)

CMOS Terahertz Receivers
Q. Zhong, W.-Y. Choi, D.-Y. Kim, Z. Ahmad, R. Xu, Y. Zhang, R. Han, S. Kshattry, N. Sharma, Z.-Y. Chen, D. Shim, S. Sankaran, E.-Y. Seok, C. Mao, F. C. DeLucia, J. P. McMillan, C. F. Neese, I. Kim, I. Momson, P. Yellswarapu, S. Dong, B. Pouya, P. Byreddy, Z. Chen, Y. Zhu, S. Ghosh, T. Dinh, F. Jalalibidgoli, J. Newman, K .K. O
IEEE Custom Integrated Circuits Conference (CICC), San Diego, CA, April 2018. (Invited)

Large-Scale Terahertz Active Arrays in Silicon Using Highly-Versatile Electromagnetic Structures  (PDF)(Slides)
C. Wang, Z. Hu, G. Zhang, J. Holloway and R. Han
IEEE Int. Electron Devices Meeting (IEDM), San Francisco, CA, Dec. 2017. (Invited)

Energy-Efficient Integrated THz Electronics Using Multi-Functional Electromagnetism and High-Parallelism Spectral Sensing
Z. Hu, C. Wang and R. Han
IEEE International Midwest Symposium on Circuits and Systems, Boston, MA, Aug. 6-9, 2017 (invited)

Fully-Scalable 2D THz Radiating Array: A 42-Element Source in 130-nm SiGe with 80-μW Total Radiated Power at 1.01 THz (PDF)(Slides)
Z. Hu and R. Han
IEEE Radio-Frequency Integrated Circuit Symposium (RFIC), Honolulu, Hawaii, Jun. 2017. (Best Student Paper Award, 2nd Place)

Devices in CMOS for Terahertz Circuits and Systems
Z. Ahmad, W. Choi, N. Sharma, J. Zhang, Q. Zhong, D.-Y. Kim, Z. Chen, Y. Zhang, R. Han, D. Shim, S. Sankaran, E.-Y. Seok, C. Cao, C. Mao, R. M. Schueler, I. R. Medvedev, D. J. Lary, H.-J. Nam, P. Raskin, F. C. DeLucia, J. P. McMillan, C. F. Neese, I. Kim, I. Momson, P. Yellswarapu, S. Dong, Z. Chen, K .K. O
232nd Electro Chemical Society Meeting, 2017. (Invited)

Rapid and Energy-Efficient Molecular Sensing Using Dual THz Combs in 65nm CMOS: A 220-to-320GHz Spectrometer with 5.2mW Radiated Power and 14.6~19.5dB Noise Figure (PDF)(Slides)
C. Wang and R. Han
IEEE Int. Solid-State Circuit Conf. (ISSCC), San Francisco, CA, Feb. 2017

On-Chip Terahertz Electronics: From Device-Electromagnetic Integration to Energy-Efficient, Large-Scale Microsystems (PDF)
R. Han, J. Holloway, C. Jiang, A. Mostajeran, E. Afshari, A. Cathelin, Y. Zhang, K. K. O, L. Boglione, T. Hancock, C. Wang, Z. Hu, G. Zhang
IEEE Int. Electron Devices Meeting (IEDM), San Francisco, CA, Dec. 2016. (Invited)

Devices and Circuits in CMOS for THz Applications
K. K. O, Z. Ahmad, W. Choi, N. Sharma, J. Zhang, Q. Zhong, D.-Y. Kim, Z. Chen, Y. Zhang, R. Han, D. Shim, S. Sankaran, E.-Y. Seok, C. Cao, C. Mao, I. R. Medvedev, D. Lary, H.-J. Nam, P. Raskin, F. C. DeLucia, I.-S. Kim, I. Momson, P. Yellswarapu, S. Dong, B.-K. Kim
IEEE Int. Electron Devices Meeting (IEDM), San Francisco, CA, Dec. 2016. (Invited)

A 320GHz Subharmonic Mixing Coherent Imager in 130nm SiGe BiCMOS
C. Jiang, A. Mostajeran, R. Han, H. Sherry, A. Cathelin, and E. Afshari
IEEE Int. Solid-State Circuit Conf. (ISSCC), San Francisco, CA, Feb. 2016

THz Imaging Circuits in CMOS
Z. Ahmad, D. Kim, R. Han, W. Choi, and K. K. O
IEEE Asia-Pacific Microwave Conference (APMC), Dec. 2015 (Invited).

Filling the Terahertz Gap with Sand: High-Power Terahertz Radiators in Silicon (PDF)
R. Han and E. Afshari
IEEE Bipolar/BiCMOS Circuits and Technology Meeting (BCTM), Boston, MA, Oct. 2015 (Invited).

A 320GHz Transmitter with 3.3mW Phase-Locked Radiation for Heterodyne Imaging Systems (PDF)
R. Han, C. Jiang, A. Mostajeran, M. Emadi, H. Aghasi, H. Sherry, A. Cathelin, and E. Afshari
IEEE Int. Solid-State Circuit Conf. (ISSCC), San Francisco, CA, Feb. 2015

A 260GHz Broadband Source with 1.1mW Continuous-Wave Radiated Power and EIRP of 15.7dBm in 65nm CMOS (PDF)
R. Han and E. Afshari
IEEE Int. Solid-State Circuit Conf. (ISSCC), San Francisco, CA, Feb. 2013.

Progress Towards mW-Power Generation in CMOS THz Signal Sources
E. Afshari, and R. Han
European Microwave Conference, Nuremberg, Germany, Nov. 2013. (Invited)

820-GHz Imaging Array Using Diode-Connected NMOS Transistors in 130-nm CMOS
D. Kim, S. Park, R. Han, and K. K. O
IEEE VLSI Circuits Symposium, Kyoto, Japan, Jun. 2013

Schottky Diodes in CMOS for Terahertz Circuits and Systems
Y. Zhang, R. Han, D. Kim, D. Shim, E. Seok, and K. K. O
IEEE Radio and Wireless Symp. (RWS), Austin, TX, Jan. 2013

CMOS Sources and Detectors for Sub-Millimeter Wave Applications
D. Shim, Y. Zhang, R. Han, D. Y. Kim, Y. Kim, S. Park, E. Seok, and K. K. O
Asia-Pacfic Microwave Conference, Seoul, Korea, Nov. 2013. (Invited)

280GHz and 860GHz Image Sensors Using Schottky-Barrier Diodes in 0.13m Digital CMOS (PDF)
R. Han, Y. Zhang, Y. Kim, D. Kim, H. Shichijo, E. Afshari and K. K. O
IEEE Int. Solid-State Circuit Conf. (ISSCC), San Francisco, CA, Feb. 2012

A Broadband 480-GHz Passive Frequency Doubler in 65-nm Bulk CMOS (PDF)
R. Han and E. Afshari
IEEE Radio Frequency Integrated Circuit Symp. (RFIC), Montreal, Canada, Jun. 2012. (Best Student Paper Award (2nd))

Terahertz Image Sensing using CMOS Schottky Barrier Diodes
R. Han, Y. Zhang, Y. Kim, D. Kim, H. Shichijo, and K. K. O
IEEE Intl. SoC Design Conf. (ISOCC), Jeju, Korea, Nov. 2012. (Invited)

Phase Matching Using Bandgap Structures for Efficient Parametric Frequency Conversion
M. Adnan, R. Han, and E. Afshari
Proc. of European Microwave Conf., Manchester, UK, Oct. 2011.

280-GHz Schottky Diode Detector in 130-nm Digital CMOS (PDF)
R. Han, Y. Zhang, D. Coquillat, J. Hoy, H. Videlier, W. Knap, E. Brown and K. K. O
IEEE Custom Integrated Circuit Conf. (CICC), San Jose, CA, Sept. 2010. (Helic Student Scholarship Award)

Towards Terahertz Operations of CMOS (PDF)
S. Sankaran, C. Mao, E. Seok, D. Shim, C. Cao, R. Han, D. Arenas, D. Tanner, S. Hill, C. Hung, and K. K. O
IEEE Int. Solid-State Circuit Conf. (ISSCC), San Francisco, CA, Feb. 2009

Paths to Terahertz CMOS Integrated Circuits
D. Shim, C. Mao, R. Han, S. Sankaran, E. Seok, C. Cao, W. Knap and K. K. O
IEEE Custom Integrated Circuits Conf. (CICC), San Jose, CA, Sept. 2009. (Invited)

Diodes in CMOS for Millimeter-Wave and Submillimeter-Wave Circuits
C. Mao, D. Shim, R. Han, S. Sankaran, E. Seok, Y. Zhang, and K. K. O
Intl. Symp. on VLSI Tech., System, and Applications, Hsinchu, Taiwan, April 2010

A Delay Model for SRAM-based FPGA Interconnects
Y. Wang, L. Wang, R. Han and J. Tong
IEEE Int. Midwest Symp. on Circuit and System (MWSCAS), Montreal, Canada, Aug. 2006